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Prof. Dr. Rolf D. Vogt
Sem Sælands vei 26 0371 OSLO, University of Oslo

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0 transport
0 Chemical Analysis
0 Vogt’s main research field is hydro-biogeochemical interactions between soil and soil water. He uses a combination of field- and laboratory studies
0 statistics as well as mathematical models to study the processes governing mobility
0 fate and effect of natural and anthropogenic compounds in the environment. Vogt’s research is conducted through truly integrated cooperation with scientists within other fields of science. His current main interest is in unravelling the effects of concurr

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Short communication
Published: 17 August 2021 in Chemosphere
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Bohai Bay, a typical semi-enclosed bay, is close to the Beijing-Tianjin-Hebei Region, the economic center of north China. The release of emerging contaminants was considerably increasing with the fast urbanization and industrialization along the coastline. However, such data, e.g. plastic polymers, are still limited. Here, polyethylene terephthalate (PET) and di-(2-ethylhexyl) phthalate (DEHP) in surface sediments and sediment cores from the coastal area of Bohai Bay were investigated. The ranges of PET and DEHP concentrations in surface sediments are 1.49–13.90 mg/kg and 0.23–19.26 mg/kg, respectively. The relatively high contents of PET and DEHP were found near the Haihe River estuary, indicating the importance of riverine input. The PET and DEHP profiles in the cores dated by the 210Pb method showed increasing trends with time. The PET in Bohai Bay was low risk evaluated by the potential ecological risk assessment. Low ecological risks of DEHP to the benthic organisms were found in the sediments, using the environmental risk limits, risk quotient, threshold effect level and probable effect level methods. The pollution levels of PET and DEHP in Bohai Bay obtained in this study may provide important data for making pollution control strategies.

ACS Style

Xue Li; Xiaoxin Han; Rolf D. Vogt; Jiaying Zhou; Boyang Zheng; Yan Zhang; Jianbo Tu; Yutong Song; Xueqiang Lu. Polyethylene terephthalate and di-(2-ethylhexyl) phthalate in surface and core sediments of Bohai Bay, China: Occurrence and ecological risk. Chemosphere 2021, 286, 131904 .

AMA Style

Xue Li, Xiaoxin Han, Rolf D. Vogt, Jiaying Zhou, Boyang Zheng, Yan Zhang, Jianbo Tu, Yutong Song, Xueqiang Lu. Polyethylene terephthalate and di-(2-ethylhexyl) phthalate in surface and core sediments of Bohai Bay, China: Occurrence and ecological risk. Chemosphere. 2021; 286 ():131904.

Chicago/Turabian Style

Xue Li; Xiaoxin Han; Rolf D. Vogt; Jiaying Zhou; Boyang Zheng; Yan Zhang; Jianbo Tu; Yutong Song; Xueqiang Lu. 2021. "Polyethylene terephthalate and di-(2-ethylhexyl) phthalate in surface and core sediments of Bohai Bay, China: Occurrence and ecological risk." Chemosphere 286, no. : 131904.

Journal article
Published: 13 August 2021 in Water
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Dissolved Natural Organic Matter (DNOM) is a heterogeneous mixture of partly degraded, oxidised and resynthesised organic compounds of terrestrial or aquatic origin. In the boreal biome, it plays a central role in element cycling and practically all biogeochemical processes governing the physico-chemistry of surface waters. Because it plays a central role in multiple aquatic processes, especially microbial respiration, an improved understanding of the biodegradability of the DNOM in surface water is needed. Here the current study, we used a relatively cheap and non-laborious analytical method to determine the biodegradability of DNOM, based on the rate and the time lapse at which it is decomposed. This was achieved by monitoring the rate of oxygen consumption during incubation with addition of nutrients. A synoptic method study, using a set of lake water samples from southeast Norway, showed that the maximum respiration rate (RR) and the normalised RR (respiration rate per unit of carbon) of the DNOM in the lakes varied significantly. This RR is conceived as a proxy for the biodegradability of the DNOM. The sUVa of the DNOM and the C:N ratio were the main predictors of the RR. This implies that the biodegradability of DNOM in these predominantly oligotrophic and dystrophic lake waters was mainly governed by their molecular size and aromaticity, in addition to its C:N ratio in the same manner as found for soil organic matter. The normalised RR (independently of the overall concentration of DOC) was predicted by the molecular weight and by the origin of the organic matter. The duration of the first phase of rapid biodegradation of the DNOM (BdgT) was found to be higher in lakes with a mixture of autochthonous and allochthonous DNOM, in addition to the amount of biodegradable DNOM.

ACS Style

Camille Crapart; Tom Andersen; Dag Olav Hessen; Nicolas Valiente; Rolf David Vogt. Factors Governing Biodegradability of Dissolved Natural Organic Matter in Lake Water. Water 2021, 13, 2210 .

AMA Style

Camille Crapart, Tom Andersen, Dag Olav Hessen, Nicolas Valiente, Rolf David Vogt. Factors Governing Biodegradability of Dissolved Natural Organic Matter in Lake Water. Water. 2021; 13 (16):2210.

Chicago/Turabian Style

Camille Crapart; Tom Andersen; Dag Olav Hessen; Nicolas Valiente; Rolf David Vogt. 2021. "Factors Governing Biodegradability of Dissolved Natural Organic Matter in Lake Water." Water 13, no. 16: 2210.

Journal article
Published: 19 July 2021 in Water
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Following successful abatement of external nutrient sources, one must shift the focus to the role of phosphorus (P) release from sediment. This enables us to better assess the causes for sustained eutrophication in freshwater ecosystem and how to deal with this challenge. In this study, five sediment cores from the shallow YuQiao Reservoir in northern China were investigated. The reservoir serves as the main raw water source for tap water services of Tianjin megacity, with a population of 15.6 million. Sediment characteristics and P fractions were determined in order to assess the role of the sediments as the P source to the water body. The total P content (TP) in sediments was similar to what was found in catchment soils, although the P sorption capacity of sediments was 7–10 times greater than for the catchment soils. Isotherm adsorption experiments documented that when P concentration in overlying water drops below 0.032–0.070 mg L−1, depending on the site, the sediment contributes with a positive flux of P to the overlying water. Adsorbed P at different depths in the sediments is found to be released with a similarly rapid release rate during the first 20 h, though chronic release was observed mainly from the top 30 cm of the sediment core. Dredging the top 30 cm layer of the sediments will decrease the level of soluble reactive phosphate in the water being sustained by the sediment flux of P.

ACS Style

Bin Zhou; Xujin Fu; Ben Wu; Jia He; Rolf Vogt; Dan Yu; Fujun Yue; Man Chai. Phosphorus Release from Sediments in a Raw Water Reservoir with Reduced Allochthonous Input. Water 2021, 13, 1983 .

AMA Style

Bin Zhou, Xujin Fu, Ben Wu, Jia He, Rolf Vogt, Dan Yu, Fujun Yue, Man Chai. Phosphorus Release from Sediments in a Raw Water Reservoir with Reduced Allochthonous Input. Water. 2021; 13 (14):1983.

Chicago/Turabian Style

Bin Zhou; Xujin Fu; Ben Wu; Jia He; Rolf Vogt; Dan Yu; Fujun Yue; Man Chai. 2021. "Phosphorus Release from Sediments in a Raw Water Reservoir with Reduced Allochthonous Input." Water 13, no. 14: 1983.

Research article
Published: 24 June 2021 in Environmental Science and Pollution Research
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This study assesses the occurrence of trace elements (TEs) in sediments of the southern Caspian Sea. A total of 16 shoreline sediment samples and 15 seabed sediment samples along five coastal transects were studied. The mean concentration of TEs follows the order of Zn > V > Cr > Ni > Cu > Pb > Co > As > Sb > Mo > Cd. The TEs had an uneven, heterogeneous distribution within the shoreline and seabed sampling sites. This is due to that the study area comprises a large number of different pollution sources, also different sediment physicochemical characteristics. Levels of individual TEs within the seabed sediment transects were higher where their shoreline sites had higher concentrations, reflecting that the coastal sites play an important role in diffusing the contaminants towards the sea. The main anthropogenic source of TEs in this highly populated region, especially in the western part, is likely a large number of discharge points of greywater entering the sea. In addition, dominant fishing industry, tourism, intense agriculture, and textile and paper industry, as well as several other commercial activities, contribute significantly to the overall loading of TEs. Based on the statistical analyses, the organic matter and mud fraction had a strong explanatory value for the spatial variation of Cu, while oxyhydroxides of Fe and Mn had good explanatory factors to govern the spatial variation of other TEs. Pb and Zn had a relatively high partition coefficient (Kd), reflecting the affinity of these elements to be sorbed to the sediment phase. Cd and Sb had lower Kd, tending to remain in the aqueous phase. Geochemical indices indicated high enrichment of Cd, Sb, Zn, and Pb at a number of sampling sites, reflecting potential local sources of contamination. The Sisangan recreational area was identified as the most contaminated site. From a public health perspective, the non-carcinogenic risk of TEs was significant only at this site. The carcinogenic risks of Pb(II) and As(III) in adults, and Pb(II), Cd(II), and As(III) in children, were tolerable.

ACS Style

Mohammad Javad Nematollahi; Behnam Keshavarzi; Farid Moore; Rolf David Vogt; Hassan Nasrollahzadeh Saravi. Trace elements in the shoreline and seabed sediments of the southern Caspian Sea: investigation of contamination level, distribution, ecological and human health risks, and elemental partition coefficient. Environmental Science and Pollution Research 2021, 1 -24.

AMA Style

Mohammad Javad Nematollahi, Behnam Keshavarzi, Farid Moore, Rolf David Vogt, Hassan Nasrollahzadeh Saravi. Trace elements in the shoreline and seabed sediments of the southern Caspian Sea: investigation of contamination level, distribution, ecological and human health risks, and elemental partition coefficient. Environmental Science and Pollution Research. 2021; ():1-24.

Chicago/Turabian Style

Mohammad Javad Nematollahi; Behnam Keshavarzi; Farid Moore; Rolf David Vogt; Hassan Nasrollahzadeh Saravi. 2021. "Trace elements in the shoreline and seabed sediments of the southern Caspian Sea: investigation of contamination level, distribution, ecological and human health risks, and elemental partition coefficient." Environmental Science and Pollution Research , no. : 1-24.

Journal article
Published: 25 August 2020 in Ecotoxicology and Environmental Safety
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This study assesses the occurrence of microplastics (MPs) in coastal and sea surface sediments, as well as water samples, collected from the coastal region of the southern Caspian Sea, Mazandaran province, Iran. A total of 32 sediment and 10 water samples were studied. The mean concentration of MPs was 15 units kg−1 in the sediments and 710 units m−3 in the coastal water. Fibers constituted by far the dominant MPs in both media, accounting for 97% of the MPs in both sediment and water samples. The MPs were mainly black in color. The dominant size of MP particles in sediment samples was between 250 and 500 μm, while the fraction >1000 μm dominated in the water samples. Polyethylene terephthalate (PET), polystyrene (PS), and nylon (NYL) were the main polymers and/or copolymers composing MPs in both sediment and water samples. The MP particles had a relatively smooth surface morphology, although signs of weathering were observed. The number of MP particles in sediment and water samples showed a general decrease from west to east in the study area. This may be reflecting the spreading of MP loading from the outlets of Sefidrud, Tonekabon, Chalus, the major rivers entering the Caspian Sea just west of the study area, and the overall decrease in the spatial distribution of touristic and fishery activity. The main sources of MP particles could be local emissions from a large number of domestic wastewater effluents and urban surface runoff due to high population density, and industrial and fishing activities in this region. This study indicated that MP particles, based on their characteristics and chemical composition, are circulated between coastal waters, and shore and sea surface sediments of the Caspian Sea, leading to their uneven distribution in the different depths. To the best of our knowledge, this is the first work studying the distribution of MP particles in sea surface sediments and also the most comprehensive on MPs in shoreline sediments and coastal waters in the southern Caspian Sea.

ACS Style

Mohammad Javad Nematollahi; Farid Moore; Behnam Keshavarzi; Rolf David Vogt; Hassan Nasrollahzadeh Saravi; Rosa Busquets. Microplastic particles in sediments and waters, south of Caspian Sea: Frequency, distribution, characteristics, and chemical composition. Ecotoxicology and Environmental Safety 2020, 206, 111137 .

AMA Style

Mohammad Javad Nematollahi, Farid Moore, Behnam Keshavarzi, Rolf David Vogt, Hassan Nasrollahzadeh Saravi, Rosa Busquets. Microplastic particles in sediments and waters, south of Caspian Sea: Frequency, distribution, characteristics, and chemical composition. Ecotoxicology and Environmental Safety. 2020; 206 ():111137.

Chicago/Turabian Style

Mohammad Javad Nematollahi; Farid Moore; Behnam Keshavarzi; Rolf David Vogt; Hassan Nasrollahzadeh Saravi; Rosa Busquets. 2020. "Microplastic particles in sediments and waters, south of Caspian Sea: Frequency, distribution, characteristics, and chemical composition." Ecotoxicology and Environmental Safety 206, no. : 111137.

Journal article
Published: 03 November 2019 in Science of The Total Environment
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Anthropogenic nanoparticles (NPs) are emitted to the environment and may be present in vegetables for human consumption. However, the toxicity of NPs exposure through food lack systematical investigations. In order to propose a systematical study, lettuce grown in a Cerium- (IV), Copper- (II) and Zinc oxide NP contaminated environment were digested. This digestate was used to culture human intestine cells (i.e. epithelial colorectal adenocarcinoma cells, Caco-2). The basolateral juice produced by the intestinal cells was then used to culture normal human liver (HL-7702) cells. Bioavailability and biotoxicity of the NPs in the vitro models were assessed. NPs were found to be taken up from the environment by vegetables, and may thus be transferred to humans through oral exposure. Bioavailability and the effect of their concentration in the digestate medium differed in regards to NP materials. The levels of NPs found in the digestate were detrimental to intestine cells, while the liver cells exposed to lower concentrations of NP in the bodily fluid showed no statically significant change in cell necrosis. A closer assessment of the detrimental effect of the studied NPs to Caco-2 cells revealed that the damage was mainly related to the solubility of the NPs. This may partly be due to that the more soluble NP material (ZnO > CuO > CeO2) render higher metal ion release and thus higher bioavailability. This appeared to cause more cell death, and even lead to local intestinal inflammation. Although no liver cells died, there was an increase of ROS level, causing ROS-related DNA damage prior to cell necrosis. The findings in this study enhances our understanding of the relative detrimental effect of different types of NPs, and the mechanisms causing their biotoxicity in human cells through food.

ACS Style

Jinxing Li; Yuchao Song; Rolf David Vogt; Yuankun Liu; Jipeng Luo; Tingqiang Li. Bioavailability and cytotoxicity of Cerium- (IV), Copper- (II), and Zinc oxide nanoparticles to human intestinal and liver cells through food. Science of The Total Environment 2019, 702, 134700 .

AMA Style

Jinxing Li, Yuchao Song, Rolf David Vogt, Yuankun Liu, Jipeng Luo, Tingqiang Li. Bioavailability and cytotoxicity of Cerium- (IV), Copper- (II), and Zinc oxide nanoparticles to human intestinal and liver cells through food. Science of The Total Environment. 2019; 702 ():134700.

Chicago/Turabian Style

Jinxing Li; Yuchao Song; Rolf David Vogt; Yuankun Liu; Jipeng Luo; Tingqiang Li. 2019. "Bioavailability and cytotoxicity of Cerium- (IV), Copper- (II), and Zinc oxide nanoparticles to human intestinal and liver cells through food." Science of The Total Environment 702, no. : 134700.

Journal article
Published: 20 November 2018 in International Journal of Greenhouse Gas Control
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Nitramines are potentially carcinogenic by-products of amines used in post-combustion CO2-capture. The influence of monoethanol (MEA)-, monomethyl (MMA)-, and dimethyl (DMA)-nitramines on the growth of environmental strains of bacteria, Pseudomonas fluorescens (P. fluorescens) and Rhodococcus spp. (R. spp.), was investigated in the laboratory. Additionally, the persistence of the nitramines in the presence of bacteria was determined. Growth of R. spp. was found to be sensitive to MMA-nitramine (EC50 = 157 mg L−1), while P. fluorescens growth was insensitive to all nitramines tested. Moreover, P. fluorescens was capable of degrading 8–10% of the nitramines during the 33 h experiments. Results from this study provide insight into important processes of bacterial response to nitramines that merit further investigation considering the ongoing implementation of CO2 capture technology.

ACS Style

Cathrine Brecke Gundersen; Tom Andersen; Rolf David Vogt; Steven D. Allison. Growth response of environmental bacteria under exposure to nitramines from CO2-capture. International Journal of Greenhouse Gas Control 2018, 79, 248 -251.

AMA Style

Cathrine Brecke Gundersen, Tom Andersen, Rolf David Vogt, Steven D. Allison. Growth response of environmental bacteria under exposure to nitramines from CO2-capture. International Journal of Greenhouse Gas Control. 2018; 79 ():248-251.

Chicago/Turabian Style

Cathrine Brecke Gundersen; Tom Andersen; Rolf David Vogt; Steven D. Allison. 2018. "Growth response of environmental bacteria under exposure to nitramines from CO2-capture." International Journal of Greenhouse Gas Control 79, no. : 248-251.

Journal article
Published: 30 September 2017 in Water
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This study assesses spatial and temporal variation in environmental variables in relation to phytoplankton community size and composition in a typically eutrophic river reservoir (Hai River, northern China). The aim is to identify environmental parameters governing spatial and temporal differences in phytoplankton density and composition. Physicochemical parameters, including nutrient concentrations, were determined in monthly surface water samples from 2015. The average concentration of key eutrophication indexes (i.e., total phosphorous (TP: 0.24 ± 0.11 mg·L−1), total nitrogen (TN: 2.96 ± 1.60 mg·L−1), and Chlorophyll a (Chl a: 38.5 ± 11.5 mg·m−3)) substantially exceeded threshold values for eutrophic streams. Moreover, the eutrophication increased significantly downstream along the river reservoir as a consequence of an increasing fraction of agricultural and industrial land-use in the watershed. 103 phytoplankton species were identified, of which Chlorophyta was the dominated phylum (47 species), followed by Bacillariophyta (23 species) and Cyanophyta (18 species). No spatial difference in species distribution (ANOVA, p > 0.05) were found, while the temporal differences in species composition exhibited significant heterogeneity (ANOVA, p < 0.001). Phytoplankton abundance was highest in early summer (June and July), with maximum values increasing from 1.78 × 108 and 2.80 × 108 cells·L−1 in upstream and middle reaches, respectively, to 4.18 × 108 cells·L−1 furthest downstream. Cyanophyta, also known as Cyanobacteria and commonly referred to as blue-green algal, are known to constitute algae bloom in eutrophic systems. Common species are Microcystis marginata, Microcystis flos-aquae, and Oscillatoria sp. This was the dominant phyla during summer months, especially in the middle and lower reaches of the stream reservoir where it accounted for 88.9% of the phytoplankton community. Shannon weaver index (H’) and Pielous’s evenness index (J’) were extremely low (1.91–2.43 for H’ and 0.39–0.45 for J’) in samples collected from the lower part of the stream during the period of algal bloom, indicating an imbalance in the phytoplankton communities. Canonical correspondence analysis (CCA) indicated that water temperature (WT) and possible pH, along with nitrate (NO3-N) and nitrite (NO2-N), were the most important explanatory parameters in regard to phytoplankton composition. This research provides an understanding of the role of physicochemical water quality parameters in governing algal blooms and phytoplankton composition in river reservoirs.

ACS Style

Wenxi Zhao; Yanying Li; Yongjie Jiao; Bin Zhou; Rolf D. Vogt; Honglei Liu; Min Ji; Zhe Ma; Anding Li; Beihai Zhou; Yaping Xu. Spatial and Temporal Variations in Environmental Variables in Relation to Phytoplankton Community Structure in a Eutrophic River-Type Reservoir. Water 2017, 9, 754 .

AMA Style

Wenxi Zhao, Yanying Li, Yongjie Jiao, Bin Zhou, Rolf D. Vogt, Honglei Liu, Min Ji, Zhe Ma, Anding Li, Beihai Zhou, Yaping Xu. Spatial and Temporal Variations in Environmental Variables in Relation to Phytoplankton Community Structure in a Eutrophic River-Type Reservoir. Water. 2017; 9 (10):754.

Chicago/Turabian Style

Wenxi Zhao; Yanying Li; Yongjie Jiao; Bin Zhou; Rolf D. Vogt; Honglei Liu; Min Ji; Zhe Ma; Anding Li; Beihai Zhou; Yaping Xu. 2017. "Spatial and Temporal Variations in Environmental Variables in Relation to Phytoplankton Community Structure in a Eutrophic River-Type Reservoir." Water 9, no. 10: 754.

Original articles
Published: 15 September 2015 in International Journal of Sustainable Development & World Ecology
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Most of China’s surface waters are undergoing anthropogenic eutrophication, mainly due to leaching of phosphorus (P) from both sewage and agriculture. This is causing quality deterioration in their scarce water resources. The problem has been acknowledged by Chinese authorities and actions sought implemented, though expected ameliorations are on hold. This interdisciplinary study focuses on actions taken by farmers adjacent to Yuqiao reservoir; the raw water source for five million people in Tianjin City. As is often the case, these farmers apply excessive amounts of fertilisers. The leaching of P is aggravated by poor P sorption capacity of the soils and a practically impermeable clay layer below a shallow ploughing layer. During heavy rainfalls the soils become saturated, causing P to be flushed out through shallow-water flow paths. A low content of organic matter in the soils makes things worse. This study documents how farmers are taking action to improve crop yield, the environment, and health issues. Farmers taking more action than others consider themselves as having good farming competence, they are usually local members of the Chinese Communist Party (CPC), and have a relatively low family income. The study concludes with suggested policy measures. The main recommendation is to collect household sewage and most of their manure and use it as feedstock for large-scale biogas reactors, combined with returning the residual organic matter to the soil. Cooperating with well-respected farmers and drawing on local CPC members’ willingness to take action may facilitate a successful implementation of the above measures.

ACS Style

Geir Inge Orderud; Rolf D. Vogt; Tom Andersen; Jing Luo. Explaining and understanding environmental actions in Chinese agriculture: the case of Yuqiao watershed of Tianjin municipality. International Journal of Sustainable Development & World Ecology 2015, 22, 1 -14.

AMA Style

Geir Inge Orderud, Rolf D. Vogt, Tom Andersen, Jing Luo. Explaining and understanding environmental actions in Chinese agriculture: the case of Yuqiao watershed of Tianjin municipality. International Journal of Sustainable Development & World Ecology. 2015; 22 (6):1-14.

Chicago/Turabian Style

Geir Inge Orderud; Rolf D. Vogt; Tom Andersen; Jing Luo. 2015. "Explaining and understanding environmental actions in Chinese agriculture: the case of Yuqiao watershed of Tianjin municipality." International Journal of Sustainable Development & World Ecology 22, no. 6: 1-14.

Journals
Published: 07 July 2015 in Environmental Science: Processes & Impacts
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This study provides a clear conceptually based and empirically verified ranking of land-use categories according to their importance as potential P leaching risk to surface waters.

ACS Style

Bin Zhou; Rolf D. Vogt; Xueqiang Lu; Xiaoguang Yang; Changwei Lü; Christian W. Mohr; Liang Zhu. Land use as an explanatory factor for potential phosphorus loss risk, assessed by P indices and their governing parameters. Environmental Science: Processes & Impacts 2015, 17, 1443 -1454.

AMA Style

Bin Zhou, Rolf D. Vogt, Xueqiang Lu, Xiaoguang Yang, Changwei Lü, Christian W. Mohr, Liang Zhu. Land use as an explanatory factor for potential phosphorus loss risk, assessed by P indices and their governing parameters. Environmental Science: Processes & Impacts. 2015; 17 (8):1443-1454.

Chicago/Turabian Style

Bin Zhou; Rolf D. Vogt; Xueqiang Lu; Xiaoguang Yang; Changwei Lü; Christian W. Mohr; Liang Zhu. 2015. "Land use as an explanatory factor for potential phosphorus loss risk, assessed by P indices and their governing parameters." Environmental Science: Processes & Impacts 17, no. 8: 1443-1454.

Original articles
Published: 12 March 2013 in International Journal of Sustainable Development & World Ecology
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Eutrophication remains a challenge for water quality, and leaching of phosphorus (P) from agriculture remains usually the determining factor as point source emissions of sewage are mainly under control. The Morsa watershed, southeast of Oslo, is a case in point. In spite of abatement actions during the past 20 years, the total concentration of P in the lake has decreased less than expected, causing growing frustration and scepticism among farmers. Hydro-biochemical interactions between phosphate (PO4) and calcium, aluminium and iron in soil and water have produced unexpected results. Decline in acid rain deposition over Norway has reduced the leaching of aluminium into water. This has caused a loss of an important fixation and removal of P by sorption to precipitating aluminium oxy-hydroxides. The combination of more precipitation and higher winter temperatures causes more flushing of P from surface soil horizons. Furthermore, water-logged soil loses much of its ability to hold PO4 in that iron is reduced, thereby allowing more P to escape. Farmers proved to have good agronomical knowledge and are taking part in an active network for spreading of agricultural practices. Reducing the amount of P in fertilizers was accepted fairly easily, whereas minimal autumn tillage has been a much harder task to implement. Therefore, just applying economic incentives will not do; developing basic environmental literacy with an ability to understand feedback loops and rebound effects is necessary. Following this, interaction between science and stakeholders is required, calling for trans-disciplinary research and trans-disciplinary processes.

ACS Style

Geir Inge Orderud; Rolf D. Vogt. Trans-disciplinarity required in understanding, predicting and dealing with water eutrophication. International Journal of Sustainable Development & World Ecology 2013, 20, 404 -415.

AMA Style

Geir Inge Orderud, Rolf D. Vogt. Trans-disciplinarity required in understanding, predicting and dealing with water eutrophication. International Journal of Sustainable Development & World Ecology. 2013; 20 (5):404-415.

Chicago/Turabian Style

Geir Inge Orderud; Rolf D. Vogt. 2013. "Trans-disciplinarity required in understanding, predicting and dealing with water eutrophication." International Journal of Sustainable Development & World Ecology 20, no. 5: 404-415.

Conference paper
Published: 19 November 2012 in Functions of Natural Organic Matter in Changing Environment
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The concentration of dissolved natural organic matter (DNOM) has increased in many streams previously suffering the effects of acid rain. DNOM plays an important role in governing the flux of phosphorous (P) in natural acid-forested environments. Phosphorous fractions, including P bound to DNOM in nine streams draining watershed with land use varying from only agriculture to completely forested land, were studied to assess the role of land use on the effect of increased DNOM on eutrophication. The study area was the forest and agricultural-dominated watershed to western Vansjø. This is a lake in south-western Norway that has been suffering severe eutrophication with extensive blooming of blue-green algae. A clear spatial variation in the water chemistry in the streams was found which was mainly explained by the different land use in their watersheds: The acid forest streams were rich in DNOM, and their main P fraction was bound to this organic material (DNOM-P); Agricultural-influenced streams were more alkaline, had higher ionic strength and higher particle loading, and their phosphorous loading was mainly bound to particles. Much of the DNOM-P in streams draining forests is lost where the stream passes through low-lying agricultural land. This is likely mainly due to sorption to particles and precipitation with calcium. The DNOM-P that reaches the lake will partly be mineralized through photo-oxidation, releasing bioavailable orthophosphate (free PO43−) to the water. The DNOM contains significant amount of Fe(III) and Al(III) which are also mineralized. These ions will precipitate in the more pH neutral lake water co-precipitating the released PO43−. The fate of DNOM-P and its impact on the eutrophication needs therefore further studies in order to be assessed.

ACS Style

Rolf D. Vogt; Alexander Engebretsen; Christian Mohr. The Effect of Increased Dissolved Natural Organic Matter on Eutrophication. Functions of Natural Organic Matter in Changing Environment 2012, 895 -899.

AMA Style

Rolf D. Vogt, Alexander Engebretsen, Christian Mohr. The Effect of Increased Dissolved Natural Organic Matter on Eutrophication. Functions of Natural Organic Matter in Changing Environment. 2012; ():895-899.

Chicago/Turabian Style

Rolf D. Vogt; Alexander Engebretsen; Christian Mohr. 2012. "The Effect of Increased Dissolved Natural Organic Matter on Eutrophication." Functions of Natural Organic Matter in Changing Environment , no. : 895-899.

Evaluation study
Published: 01 October 2011 in Science of The Total Environment
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Many heavily polluted areas are located in remote regions that lack routine hydrologic monitoring. A modelling method that can produce scenarios of water chemistry trends for regions that lack hydrological data is therefore needed. The Wanshan mining area, in Guizhou province in south-western China, is such a region, as it is heavily polluted with mercury (Hg). In order to model Hg transport in a stream draining the Wanshan mining area, a Geographic Information System (GIS) hydrologic model (HEC-HMS) was coupled with a simulation model for Hg fractions in water (WASP Hg). Hydrological variations in the stream flow can thereby be simulated based on readily available precipitation data. The WASP 7 MERC Hg model was used for simulating variations in total Hg, dissolved Hg and methyl-Hg concentrations. The results of HEC-HMS modelling of flow show clear seasonal variation. Winter (Oct-Dec) constitutes the dry season with low flow, while the summer season (Jun-Aug) is rainy with high flow. 48% of total annual precipitation happens in the three summer months. The stream flows at the high flow events were several times higher than normal flow. The modelled total suspended solids and Hg concentrations were tested against monitoring data from two sampling campaigns conducted in September 2007 and August 2008. The model produced reasonable simulations for TSS, THg, DHg and MeHg, with relative errors generally around 10% for the modelled parameters. High flow events are the main contributors for release of both suspended particles and Hg. The three high flow events account for about 50% of annual discharge of THg. The annual total discharge of Hg was 8.8 kg Hg high up in the stream and 2.6 kg where the stream meets a large river 20 km downstream of the pollution source. Hence, about 70% of Hg is retained in the stream through sedimentation.

ACS Style

Yan Lin; Thorjørn Larssen; Rolf D. Vogt; Xinbin Feng; Hua Zhang. Modelling transport and transformation of mercury fractions in heavily contaminated mountain streams by coupling a GIS-based hydrological model with a mercury chemistry model. Science of The Total Environment 2011, 409, 4596 -4605.

AMA Style

Yan Lin, Thorjørn Larssen, Rolf D. Vogt, Xinbin Feng, Hua Zhang. Modelling transport and transformation of mercury fractions in heavily contaminated mountain streams by coupling a GIS-based hydrological model with a mercury chemistry model. Science of The Total Environment. 2011; 409 (21):4596-4605.

Chicago/Turabian Style

Yan Lin; Thorjørn Larssen; Rolf D. Vogt; Xinbin Feng; Hua Zhang. 2011. "Modelling transport and transformation of mercury fractions in heavily contaminated mountain streams by coupling a GIS-based hydrological model with a mercury chemistry model." Science of The Total Environment 409, no. 21: 4596-4605.

Journal article
Published: 28 February 2011 in Applied Geochemistry
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Levels of the chalcophile metals Hg, Pb, Cd, Cu and Zn and the metalloid As in soils from rice paddy fields were assessed in two regions impacted by different industrial activities in Guizhou province, China. The two study areas (Wanshan and Qingzhen) have previously received attention in the international literature due to heavy Hg pollution, though levels of other potentially harmful elements have not previously been reported. The regions were selected as representing two important, but categorically different metal(loid) contaminated areas in China: Wanshan has been a major region for Hg production while Qingzhen is an important region for a large range of various heavy industries based on coal as an energy source. Within a limited distance of the Hg mine tailings in Wanshan the rice paddy fields are heavily contaminated by Hg (median concentration 25 μg g−1, maximum 119 μg g−1) and moderately contaminated by Zn and Cd (median concentrations of 86 and 0.9 μg g−1, respectively). Zinc and Cd levels correlate well with Hg contamination, which indicates a similar source and mechanism of transport and accumulation. Other studies have concluded that the main sources of Hg contamination in Wanshan are the numerous Hg mine tailings. This is likely as these metals are all geochemically associated with the mineral cinnabar (HgS). The other chalcophile elements (Pb, Cu and As) are nevertheless found at background levels only. In Qingzhen the soils were found to contain elevated levels of As and Hg (median concentrations of 38 and 0.3 μg g−1, respectively). These are elements that are known to be more associated with coal and released during coal combustion.

ACS Style

Marthe-Lise Søvik; Thorjørn Larssen; Rolf D. Vogt; Grethe Wibetoe; Xinbin Feng. Potentially harmful elements in rice paddy fields in mercury hot spots in Guizhou, China. Applied Geochemistry 2011, 26, 167 -173.

AMA Style

Marthe-Lise Søvik, Thorjørn Larssen, Rolf D. Vogt, Grethe Wibetoe, Xinbin Feng. Potentially harmful elements in rice paddy fields in mercury hot spots in Guizhou, China. Applied Geochemistry. 2011; 26 (2):167-173.

Chicago/Turabian Style

Marthe-Lise Søvik; Thorjørn Larssen; Rolf D. Vogt; Grethe Wibetoe; Xinbin Feng. 2011. "Potentially harmful elements in rice paddy fields in mercury hot spots in Guizhou, China." Applied Geochemistry 26, no. 2: 167-173.

Journal article
Published: 01 September 2010 in Science of The Total Environment
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Nearly 20 years of industrial scale metal mining operations in Tibet have caused an impact on the region's surface water quality. However, no information with respect to the pollution has been provided to the public. The aim of this work was to evaluate the chemical quality of the stream water and to assess the present and future potential risks of acid mine drainage to the regional and downstream environments. This study, based on data collected in 2006, 2007 and 2008 in the Gyama valley, using the Environmental Risk Index (IER) documents that elevated concentrations of Cu, Pb, Zn, Mn, Fe and Al in the surface water and streambed at the upper/middle part of the valley pose a considerably high risk to the local environment. In contrast, the risk level at the stream source area is zero and only minor risk at the lower reaches. The iron and copper contamination of the upper/middle part of the river appears to be both natural and accelerated by the mining activities. The level of dissolved contaminants in the water decreases within short distance downstream due to precipitation and sorption to the streambed and strong dilution by a tributary stream and eventually by the Lhasa River. A high content of heavy metals in the stream sediments as well as in a number of tailings with gangue and material from the ore processing, poses a great potential threat to the downstream water users. Environmental changes such as global warming or increased mining activity may increase the mobility of these pools of heavy metals.

ACS Style

Xiang Huang; Mika Sillanpää; Egil T. Gjessing; Sirpa Peräniemi; Rolf D. Vogt. Environmental impact of mining activities on the surface water quality in Tibet: Gyama valley. Science of The Total Environment 2010, 408, 4177 -4184.

AMA Style

Xiang Huang, Mika Sillanpää, Egil T. Gjessing, Sirpa Peräniemi, Rolf D. Vogt. Environmental impact of mining activities on the surface water quality in Tibet: Gyama valley. Science of The Total Environment. 2010; 408 (19):4177-4184.

Chicago/Turabian Style

Xiang Huang; Mika Sillanpää; Egil T. Gjessing; Sirpa Peräniemi; Rolf D. Vogt. 2010. "Environmental impact of mining activities on the surface water quality in Tibet: Gyama valley." Science of The Total Environment 408, no. 19: 4177-4184.

Journal article
Published: 01 December 2009 in Science of The Total Environment
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The Tibetan Plateau covers an area of about one fourth of Europe, has an average elevation over 4000 m above sea level, and is the water sources for about 40% of world's population. In order to foresee future changes in water quality, it is important to understand what pressures are governing the spatial variation in water chemistry. In this paper the chemistry including major ions and trace elements in the headwaters of four major Asian rivers (i.e. the Salween, Mekong, Yangtze River and Yarlung Tsangpo) in the Tibetan Plateau was studied. The results showed that the content of dissolved salts in these Tibetan rivers was relatively high compared to waters from other parts of the world. The chemical composition of the four rivers were rather similar, with Ca2+ and HCO3− being the dominating ions. The exception was the Yangtze River on the Plateau, which was enriched in Na+, Cl−, SO42− and Li due to silicate weathering followed by strong evaporation caused by a negative water balance, dissolution of evaporites in the catchment and some drainage from saline lakes. The concentrations of heavy metals (Cu, Co, Cr, Ni, Cd, Pb, and Hg) and As, NH4+ were generally low in all the rivers. Anthropogenic impacts on the quality of the rivers were identified at a few locations in the Mekong River and Yarlung Tsangpo basins. Generally, the main spatial variation in chemical compositions of these under studied rivers was found to be governed mainly by difference in geological variation and regional climatic-environment. Climate change is, therefore, one of main determining factors on the water chemical characteristics of these headwaters of Asian major rivers in the Tibetan Plateau.

ACS Style

Xiang Huang; Mika Sillanpää; Egil T. Gjessing; Rolf D. Vogt. Water quality in the Tibetan Plateau: Major ions and trace elements in the headwaters of four major Asian rivers. Science of The Total Environment 2009, 407, 6242 -6254.

AMA Style

Xiang Huang, Mika Sillanpää, Egil T. Gjessing, Rolf D. Vogt. Water quality in the Tibetan Plateau: Major ions and trace elements in the headwaters of four major Asian rivers. Science of The Total Environment. 2009; 407 (24):6242-6254.

Chicago/Turabian Style

Xiang Huang; Mika Sillanpää; Egil T. Gjessing; Rolf D. Vogt. 2009. "Water quality in the Tibetan Plateau: Major ions and trace elements in the headwaters of four major Asian rivers." Science of The Total Environment 407, no. 24: 6242-6254.

Journal article
Published: 31 August 2008 in Atmospheric Research
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ACS Style

Jiannong Quan; Xiaoshan Zhang; Qiang Zhang; Jingheng Guo; Rolf D. Vogt. Importance of sulfate emission to sulfur deposition at urban and rural sites in China. Atmospheric Research 2008, 89, 283 -288.

AMA Style

Jiannong Quan, Xiaoshan Zhang, Qiang Zhang, Jingheng Guo, Rolf D. Vogt. Importance of sulfate emission to sulfur deposition at urban and rural sites in China. Atmospheric Research. 2008; 89 (3):283-288.

Chicago/Turabian Style

Jiannong Quan; Xiaoshan Zhang; Qiang Zhang; Jingheng Guo; Rolf D. Vogt. 2008. "Importance of sulfate emission to sulfur deposition at urban and rural sites in China." Atmospheric Research 89, no. 3: 283-288.

Journal article
Published: 30 June 2007 in Applied Geochemistry
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Acid rain, due to wet and dry deposition of S and N compounds, is an increasing environmental problem in China. A considerable deposition of alkaline dust serves to mitigate the acidifying effect to varying extent. Data from 3 years, a monitoring of water chemistry in 10 water compartments (i.e., two qualities of deposition, two types of throughfall, solution in five genetic soil horizons, and runoff) at five well documented sub-tropical forested catchments, have been interpreted in order to identify key processes governing the water chemistry in catchments suffering acid rain. This study of water chemistry in regions with sub-tropical climate supplements similar monitoring studies conducted in temperate regions with different types of soils and compositions of deposition. Natural organic acids as well as nutrient cycling of K+ have strong influence on the water chemistry in throughfall and upper soil horizons at the relatively pristine sites. At sites receiving elevated S and N deposition an accelerated cycling of K+ removes much of the mineral acidity in throughfall. The soil uptake of this K+ results in release of H+. Nitrification and/or assimilation of a substantial deposition of reduced N contributes at some sites also significantly to the acidity in the soils. During the study period, Ca2+ in solution was exchanged for Al3+ in the soils with an effective base saturation less than 20%. In deeper soil horizons most of this mobilized Al is re-adsorbed along with SO42-.

ACS Style

Rolf D. Vogt; Jingheng Guo; Jiahai Luo; Xiaoyu Peng; Renjun Xiang; Jinsong Xiao; Xiaoshan Zhang; Dawei Zhao; Yu Zhao. Water chemistry in forested acid sensitive sites in sub-tropical Asia receiving acid rain and alkaline dust. Applied Geochemistry 2007, 22, 1140 -1148.

AMA Style

Rolf D. Vogt, Jingheng Guo, Jiahai Luo, Xiaoyu Peng, Renjun Xiang, Jinsong Xiao, Xiaoshan Zhang, Dawei Zhao, Yu Zhao. Water chemistry in forested acid sensitive sites in sub-tropical Asia receiving acid rain and alkaline dust. Applied Geochemistry. 2007; 22 (6):1140-1148.

Chicago/Turabian Style

Rolf D. Vogt; Jingheng Guo; Jiahai Luo; Xiaoyu Peng; Renjun Xiang; Jinsong Xiao; Xiaoshan Zhang; Dawei Zhao; Yu Zhao. 2007. "Water chemistry in forested acid sensitive sites in sub-tropical Asia receiving acid rain and alkaline dust." Applied Geochemistry 22, no. 6: 1140-1148.

Journal article
Published: 15 August 2006 in Science of The Total Environment
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Acid rain may cause soil acidification possibly leading to indirect forest damage. Assessment of acidification potential of atmospheric deposition is problematic where dry and occult deposition is significant. Furthermore, uncertainty is enhanced where a substantial part of the potential acidity is represented by deposition of ammonium (NH4+) since the degree of assimilation and nitrification is not readily available. Estimates of dry deposition based on deposition velocity are highly uncertain and the models need to be verified or calibrated by field measurements of total deposition. Total deposition may be monitored under the forest canopy. The main problem with this approach is the unknown influence of internal bio-cycling. Moreover, bio-cycling may neutralize much of the acidity by leaching of mainly K+. When the water percolates down into the rooting zone this K+ is assimilated again and acidity is regenerated. Most monitoring stations only measure deposition. Lacking measurements of output flux of both NH4+ and NO3− from the soil one cannot assess current net N transformation rates. Assumptions regarding the fate of ammonium in the soil have strong influence on the estimated acid load. Assuming that all the NH4+ is nitrified may lead to an overestimation of the acidifying potential. In parts of the world where dry deposition and ammonium are important special consideration of these factors must be made when assessing the acidification potential of total atmospheric loading. In China dry and occult deposition is considerable and often greater than wet deposition. Furthermore, the main part of the deposited N is in its reduced state (NH4+). The IMPACTS project has monitored the water chemistry as it moves through watersheds at 5 sites in China. This paper dwells at two important findings in this study. 1) Potassium leached from the canopy by acid rain is assimilated again upon entering the mineral soil. 2) Nitrification apparently mainly takes place in forest floor (H- and O-) horizon as NH4+ that escapes this horizon is efficiently assimilated in the A-horizon. This suggests that the potential acidification capacity of the deposition may be found in the throughfall and forest floor solution by treating K+ and NH4+, respectively, as acid cations in a base neutralization capacity (BNC) calculation.

ACS Style

Rolf D. Vogt; Hans Martin Seip; Thorjørn Larssen; Dawei Zhao; Renjun Xiang; Jinsong Xiao; Jiahai Luo; Yu Zhao. Potential acidifying capacity of deposition: Experiences from regions with high NH4+ and dry deposition in China. Science of The Total Environment 2006, 367, 394 -404.

AMA Style

Rolf D. Vogt, Hans Martin Seip, Thorjørn Larssen, Dawei Zhao, Renjun Xiang, Jinsong Xiao, Jiahai Luo, Yu Zhao. Potential acidifying capacity of deposition: Experiences from regions with high NH4+ and dry deposition in China. Science of The Total Environment. 2006; 367 (1):394-404.

Chicago/Turabian Style

Rolf D. Vogt; Hans Martin Seip; Thorjørn Larssen; Dawei Zhao; Renjun Xiang; Jinsong Xiao; Jiahai Luo; Yu Zhao. 2006. "Potential acidifying capacity of deposition: Experiences from regions with high NH4+ and dry deposition in China." Science of The Total Environment 367, no. 1: 394-404.

Research article
Published: 01 June 2004 in Aquatic Sciences
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The objective of this study was to extract and evaluate key catchment characteristics explaining the main variation in properties of dissolved natural organic matter (DNOM) in surface waters draining each catchment. A number of classical and sophisticated DNOM characterisation methodologies were used for this purpose. The explanatory capability of site characteristics on the variation in descriptors of DNOM, including elemental analysis (EA), DOC fractionation, SEC, CZE, CGE, UV/Vis- and FTIR spectra, FES, TLS, ESR, ESI/MS, 13C-CPMAS-NMR, potentiometric pH titration as well as functional characteristics such as biodegradability, and the response of macrophyte and PAH partitioning coefficients were evaluated. The sampling sites were all natural, coniferous, heathery-forested catchments with bogs, forming a climatic, anthropogenic deposition and proportional biotope cover gradient. Correlations to the main principal components, as well as a correlation matrix, singled out total S-deposition as the key explanatory site parameter, accounting for most of the variation in DNOM descriptors. Other significant factors were H+ concentration, length of growing season, biotope coverage (i.e., peatland/ or lake/watershed ratio), site elevation and TOC concentration. Total sulphur (S) deposition was strongly negatively correlated to the molecular weight, aromaticity, carboxylic acidity and sorption capacity of PAH. A greater proportion of lake and Histosol biotopes of the sampling sites were reflected in a greater aliphatic character of the DNOM. PCA clustering of samples from the same site in spring and fall showed a basic site-specific DNOM quality and a weak season effect. The Hasse diagram technique (a method of partial order theory) was used to show, for instance, how the relative Histosol coverage may determine NOM quality and, in turn, how this coincides with high macrophyte response.

ACS Style

Bimal Chatterjee; Egil Gjessing; Jussi Kukkonen; Andrea Paul; Stephan Pflugmacher; Mike Starr; Christian E. W. Steinberg; Philippe Schmitt-Kopplin; Rolf D. Vogt; Jarkko Akkanen; Dag Olav Andersen. Key site variables governing the functional characteristics of Dissolved Natural Organic Matter (DNOM) in Nordic forested catchments. Aquatic Sciences 2004, 66, 195 -210.

AMA Style

Bimal Chatterjee, Egil Gjessing, Jussi Kukkonen, Andrea Paul, Stephan Pflugmacher, Mike Starr, Christian E. W. Steinberg, Philippe Schmitt-Kopplin, Rolf D. Vogt, Jarkko Akkanen, Dag Olav Andersen. Key site variables governing the functional characteristics of Dissolved Natural Organic Matter (DNOM) in Nordic forested catchments. Aquatic Sciences. 2004; 66 (2):195-210.

Chicago/Turabian Style

Bimal Chatterjee; Egil Gjessing; Jussi Kukkonen; Andrea Paul; Stephan Pflugmacher; Mike Starr; Christian E. W. Steinberg; Philippe Schmitt-Kopplin; Rolf D. Vogt; Jarkko Akkanen; Dag Olav Andersen. 2004. "Key site variables governing the functional characteristics of Dissolved Natural Organic Matter (DNOM) in Nordic forested catchments." Aquatic Sciences 66, no. 2: 195-210.