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Mercury (Hg) accumulation in rice is an emerging health concern worldwide. However, sources and interactions responsible for Hg species accumulation in different rice tissues are still uncertain. Four experimental plots were carefully designed at an artisanal Hg mining site and a control site to evaluate the effect of atmospheric and soil Hg contents on Hg accumulation in rice. We showed that inorganic Hg (IHg) contents in rice tissues grown either in contaminated or control site soil (non-contaminated soil) were higher at Hg artisanal mining site than those at the control site. Elevated total gaseous mercury (TGM) levels in ambient air were the predominant source of IHg to rice at the Hg mining area. Methylmercury (MeHg) concentrations in rice plant tissues increased in proportionality with MeHg contents in paddy soil. Our results suggest that both atmosphere and soil Hg sources have been impacted the IHg accumulation in rice. Above ground rice tissues, grains, leaves, and stalk accumulated IHg from both atmosphere and soil to varying degrees. Nonetheless, the study also provides the first direct evidence that atmospheric Hg accumulated by above-ground rice tissues could be translocated to below-ground tissues (roots). However, the extent to which atmosphere or soil Hg contributes to IHg in rice tissues may vary with each source's concentration gradient at the given site. No evidence of in planta Hg methylation was found during the current study. Hence, paddy fields are potential MeHg production sites, whereas paddy soil is a unique MeHg accumulation source in rice plants. This study expands and clarifies the contribution of various sources involved in Hg accumulation in the soil rice system. The findings here provide the basis for future research strategies to deal with the global issue of Hg contaminated rice.
Muhammad Wajahat Aslam; Bo Meng; Mahmoud A. Abdelhafiz; Jiang Liu; Xinbin Feng. Unravelling the interactive effect of soil and atmospheric mercury influencing mercury distribution and accumulation in the soil-rice system. Science of The Total Environment 2021, 149967 .
AMA StyleMuhammad Wajahat Aslam, Bo Meng, Mahmoud A. Abdelhafiz, Jiang Liu, Xinbin Feng. Unravelling the interactive effect of soil and atmospheric mercury influencing mercury distribution and accumulation in the soil-rice system. Science of The Total Environment. 2021; ():149967.
Chicago/Turabian StyleMuhammad Wajahat Aslam; Bo Meng; Mahmoud A. Abdelhafiz; Jiang Liu; Xinbin Feng. 2021. "Unravelling the interactive effect of soil and atmospheric mercury influencing mercury distribution and accumulation in the soil-rice system." Science of The Total Environment , no. : 149967.
Antimony (Sb) isotopes have been shown to be promising tracers for studying Sb cycling in the environment and its impact on ecosystem and human health. Yet precise measurements of Sb isotopic composition have been challenged by low Sb concentrations and high matrix effect and by the lack of a common reference material (zero-delta). Here we report an improved analytical scheme that is capable of high-precision measurement of Sb isotopes in environmental and geochemical samples. The method employs a two-column ion exchange set-up to remove interfering matrix elements to allow Sb isotopic measurements with low Sb (< 0.15 μg/g) and high matrix content. The instrument mass bias is corrected by combining the sample-standard bracketing method with internal normalization of cadmium. To allow for interlaboratory comparisons, a standard reference material certified for the total Sb concentration, NIST SRM 3102a, is recommended as the reference standard (“zero-delta”) for Sb isotope measurements. The improved method is applied for high-precision and high-accuracy Sb isotope composition measurements in environmental and geochemical reference samples with a minimum Sb required per analysis as low as 3.0 ng. By expressing our data and previously reported literature data against the same reference standard (NIST SRM 3102a), we provide an update on isotopic compositions of various types of environmental, geological and anthropogenic materials. The improved analytical method and database aid further studies on the mechanisms of Sb isotope fractionation and its application as a tracer for the study of the sources, processes and fate of Sb in the environment.
Guangyi Sun; Yunjie Wu; Xinbin Feng; Xian Wu; Xinyu Li; Qianwen Deng; Feiyue Wang; Xuewu Fu. Precise analysis of antimony isotopic composition in geochemical materials by MC-ICP-MS. Chemical Geology 2021, 582, 120459 .
AMA StyleGuangyi Sun, Yunjie Wu, Xinbin Feng, Xian Wu, Xinyu Li, Qianwen Deng, Feiyue Wang, Xuewu Fu. Precise analysis of antimony isotopic composition in geochemical materials by MC-ICP-MS. Chemical Geology. 2021; 582 ():120459.
Chicago/Turabian StyleGuangyi Sun; Yunjie Wu; Xinbin Feng; Xian Wu; Xinyu Li; Qianwen Deng; Feiyue Wang; Xuewu Fu. 2021. "Precise analysis of antimony isotopic composition in geochemical materials by MC-ICP-MS." Chemical Geology 582, no. : 120459.
Methylmercury (MeHg) contamination in paddy fields is a significant environmental issue globally since over half of the population of our planet consumes rice. MeHg is a neurotoxin produced by microorganisms in oxygen-limited environments. Microbial effect on MeHg production is a hotspot of research; however, it has been largely ignored how the oxidation–reduction potential (Eh) shapes MeHg formation. Here, we elucidated Hg (de)-methylation in a contaminated soil by increasing Eh stepwise from −300 to +300 mV using a sophisticated biogeochemical microcosm. At the Eh range from −300 to −100 mV, high MeHg concentration and dissolved total Hg (THg) concentration were found due to a high relative abundance of Hg-methylation bacteria (e.g., Desulfitobacterium spp.), acidification, and reductive dissolution of Fe(oxyhydr)oxides. At the Eh range from 0 to +200 mV, the formation of colloids leads to adsorption of Hg and as a result colloidal Hg increased. MeHg reduction with Eh (−300 to +200 mV) increase was mainly attributed to a reduced Hg methylation, as dissolved THg and relative abundance of Desulfitobacterium spp. decreased by 50 and 96%, respectively, at Eh of +200 mV as compared to Eh of −300 mV. Mercury demethylation might be less important since the relative abundance of demethylation bacteria (Clostridium spp.) also decreased over 93% at Eh of +200 mV. These new results are crucial for predicting Hg risks in paddy fields.
Jianxu Wang; Sabry M. Shaheen; Min Jing; Christopher W. N. Anderson; Ann-Christin Swertz; Shan-Li Wang; Xinbin Feng; Jörg Rinklebe. Mobilization, Methylation, and Demethylation of Mercury in a Paddy Soil Under Systematic Redox Changes. Environmental Science & Technology 2021, 55, 10133 -10141.
AMA StyleJianxu Wang, Sabry M. Shaheen, Min Jing, Christopher W. N. Anderson, Ann-Christin Swertz, Shan-Li Wang, Xinbin Feng, Jörg Rinklebe. Mobilization, Methylation, and Demethylation of Mercury in a Paddy Soil Under Systematic Redox Changes. Environmental Science & Technology. 2021; 55 (14):10133-10141.
Chicago/Turabian StyleJianxu Wang; Sabry M. Shaheen; Min Jing; Christopher W. N. Anderson; Ann-Christin Swertz; Shan-Li Wang; Xinbin Feng; Jörg Rinklebe. 2021. "Mobilization, Methylation, and Demethylation of Mercury in a Paddy Soil Under Systematic Redox Changes." Environmental Science & Technology 55, no. 14: 10133-10141.
Methylmercury (MeHg) is highly toxic. Rice can accumulate high levels of MeHg. Rice is the staple food of more than half of the world's population, therefore MeHg exposure via rice consumption has became a global emerging issue. This article reviews the rice Hg concentration in the world, the bioaccumulation mechanism of MeHg in rice, the human Hg exposure from rice consumption, and health effects. It found that rice Hg concentrations from non-contaminated areas around the world are generally within the safe intake range. The majority of MeHg in rice is found in edible white rice, since MeHg in rice plants can form MeHg-Cys complex (MeHg-cysteine), which can be transferred into rice grain during maturation of rice. Exposure to MeHg through rice consumption can reduce antioxidant activity and damage the nervous system in rat and may cause children's intelligence decline.
Lin Feng; Ping Li; Xinbin Feng. Methylmercury bioaccumulation in rice and health effects: A systematic review. Current Opinion in Environmental Science & Health 2021, 23, 100285 .
AMA StyleLin Feng, Ping Li, Xinbin Feng. Methylmercury bioaccumulation in rice and health effects: A systematic review. Current Opinion in Environmental Science & Health. 2021; 23 ():100285.
Chicago/Turabian StyleLin Feng; Ping Li; Xinbin Feng. 2021. "Methylmercury bioaccumulation in rice and health effects: A systematic review." Current Opinion in Environmental Science & Health 23, no. : 100285.
To understand the ambient levels and sources of atmospheric mercury (Hg) in the Tibetan Plateau, a full-year continuous measurement of speciated atmospheric mercury was conducted at Waliguan (WLG) Baseline Observatory (3816 m a.s.l.) from May 2012 to April 2013. Mean concentrations (±1 SD) of gaseous elemental mercury (GEM), gaseous oxidized mercury (GOM) and particulate bound mercury (PBM) during the whole study period were 1.90 ± 0.80 ng m−3, 12.0 ± 10.6 pg m−3 and 65.4 ± 63.2 pg m−3, respectively. Seasonal variations of GEM were very small, while those of PBM were quite large with mean values being four times higher in cold (102.3 ± 66.7 pg m−3) than warm (22.8 ± 14.6 pg m−3) season. Anthropogenic emissions to the east of Tibetan Plateau contributed significantly to GEM pollution at WLG, while dust particles originated from desert and Gobi regions in Xinjiang province and Tibetan Plateau to the west of WLG were responsible to PBM pollution at WLG. This finding is also supported by the significant positive correlation between daily PBM concentration and daily cumulative absorbing aerosol index (AAI) encountered by air masses transported during the preceding two days.
Hui Zhang; Xuewu Fu; Ben Yu; Baoxin Li; Peng Liu; Guoqing Zhang; Leiming Zhang; Xinbin Feng. Speciated atmospheric mercury at Waliguan Global Atmospheric Watch station in the northeastern Tibetan Plateau: implication of dust related sources for particulate bound mercury. 2021, 2021, 1 -25.
AMA StyleHui Zhang, Xuewu Fu, Ben Yu, Baoxin Li, Peng Liu, Guoqing Zhang, Leiming Zhang, Xinbin Feng. Speciated atmospheric mercury at Waliguan Global Atmospheric Watch station in the northeastern Tibetan Plateau: implication of dust related sources for particulate bound mercury. . 2021; 2021 ():1-25.
Chicago/Turabian StyleHui Zhang; Xuewu Fu; Ben Yu; Baoxin Li; Peng Liu; Guoqing Zhang; Leiming Zhang; Xinbin Feng. 2021. "Speciated atmospheric mercury at Waliguan Global Atmospheric Watch station in the northeastern Tibetan Plateau: implication of dust related sources for particulate bound mercury." 2021, no. : 1-25.
Hui Zhang; Xuewu Fu; Ben Yu; Baoxin Li; Peng Liu; Guoqing Zhang; Leiming Zhang; Xinbin Feng. Supplementary material to "Speciated atmospheric mercury at Waliguan Global Atmospheric Watch station in the northeastern Tibetan Plateau: implication of dust related sources for particulate bound mercury". 2021, 1 .
AMA StyleHui Zhang, Xuewu Fu, Ben Yu, Baoxin Li, Peng Liu, Guoqing Zhang, Leiming Zhang, Xinbin Feng. Supplementary material to "Speciated atmospheric mercury at Waliguan Global Atmospheric Watch station in the northeastern Tibetan Plateau: implication of dust related sources for particulate bound mercury". . 2021; ():1.
Chicago/Turabian StyleHui Zhang; Xuewu Fu; Ben Yu; Baoxin Li; Peng Liu; Guoqing Zhang; Leiming Zhang; Xinbin Feng. 2021. "Supplementary material to "Speciated atmospheric mercury at Waliguan Global Atmospheric Watch station in the northeastern Tibetan Plateau: implication of dust related sources for particulate bound mercury"." , no. : 1.
The cement industry is considered to be an important anthropogenic thallium (Tl) emission source, and yet few reports have been released concerning the fate of Tl during cement production and the emissions of Tl from cement plants (CPs). In this study, three precalciner CPs in the Guizhou province in southwest China were systematically investigated, with all input/output solid materials collected and analyzed. Despite using different raw materials, strong Tl enrichment during the clinker production was observed in all three CPs, with enrichment factors ranging from 85 to 148. Tl concentrations in limestone and most other raw materials were low (0.032–4.163 mg kg−1), but they were 100–700 times higher in the raw meal and kiln tail dust due to circulation and enrichment inside the system. Only a low percentage (3–8 %) of Tl exited the system via the clinker and stack emissions. Atmospheric emission factors of Tl from the three CPs ranged from 0.168 to 0.980 mg Tl tonne−1 clinker, with an average of 0.674 mg Tl tonne−1 clinker. Annual atmospheric Tl emissions from all the CPs were estimated to be 54 kg·yr−1 in Guizhou province and 964 kg·yr−1 over all of China in 2018. Shuttling kiln tail dust may reduce the Tl enrichment during clinker production, and Tl recycled from this material may have commercial value.
Yiming Huang; Jinling Liu; Xinbin Feng; Guojia Hu; Xinyu Li; Leiming Zhang; Lu Yang; Guan Wang; Guangyi Sun; ZhongGen Li. Fate of thallium during precalciner cement production and the atmospheric emissions. Process Safety and Environmental Protection 2021, 151, 158 -165.
AMA StyleYiming Huang, Jinling Liu, Xinbin Feng, Guojia Hu, Xinyu Li, Leiming Zhang, Lu Yang, Guan Wang, Guangyi Sun, ZhongGen Li. Fate of thallium during precalciner cement production and the atmospheric emissions. Process Safety and Environmental Protection. 2021; 151 ():158-165.
Chicago/Turabian StyleYiming Huang; Jinling Liu; Xinbin Feng; Guojia Hu; Xinyu Li; Leiming Zhang; Lu Yang; Guan Wang; Guangyi Sun; ZhongGen Li. 2021. "Fate of thallium during precalciner cement production and the atmospheric emissions." Process Safety and Environmental Protection 151, no. : 158-165.
High geological background levels of trace elements (TEs) and high population density in the karst areas of southwest China have imposed environmental pressure on the fragile ecosystems in this region. Understanding the mass budget of TEs, especially the toxic ones, is of great importance to sustain future developments. This study investigates the mass balance and fate of nine TEs (cadmium, arsenic, lead, chromium, copper, nickel, zinc, thallium, and antimony) in two karst catchments (Huilong and Chenqi) in southwest China through estimation of their mass budgets in throughfall, open field precipitation, total suspended particulate matter (TSP), litterfall, fertilization, harvested crops, surface runoff, and underground runoff. The estimated net fluxes are positive, indicating a source region, for four elements (Cu, Cr, Ni, and Tl) and negative, indicating a sink region, for five elements (As, Cd, Pb, Sb, and Zn) in both catchments. The net fluxes for the nine elements in Chenqi catchment are within a relatively small range (2.6, 2.0, 1.6, 0.6, −0.05, −0.5, −0.5, −2.9, and −3.3 mg m−2 yr−1 for Cu, Ni, Cr, Tl, Cd, Zn, Sb, Pb, and As, respectively), but in Huilong catchment in quite a large range (15.5, 6.0, 1.0, 0.8, −0.3, −0.9, −4.5, −7.5, and −8.7 mg m−2 yr−1 for Tl, Cr, Ni, Cu, Cd, Sb, As, Pb, and Zn, respectively). Rainfall (12.3%–66.2%) and litterfall (18.4%–81.3%) are the major input flux pathways, while crops harvest (16%–99%) is the major output flux pathway for the TEs in both catchments, indicating that the fate of TEs is shaped by both natural factors such as precipitation and litterfall and human activities such as fertilization and crop harvesting in these forestland-farmland compound karst catchments. Results from this study suggest that restoring forests from low-yield sloping farmlands will be useful for controlling TEs pollution in these fragile karst regions with high geological background TEs.
Jicheng Xia; Jianxu Wang; Leiming Zhang; Xun Wang; Wei Yuan; Hui Zhang; Tao Peng; Xinbin Feng. Mass balance of nine trace elements in two karst catchments in southwest China. Science of The Total Environment 2021, 786, 147504 .
AMA StyleJicheng Xia, Jianxu Wang, Leiming Zhang, Xun Wang, Wei Yuan, Hui Zhang, Tao Peng, Xinbin Feng. Mass balance of nine trace elements in two karst catchments in southwest China. Science of The Total Environment. 2021; 786 ():147504.
Chicago/Turabian StyleJicheng Xia; Jianxu Wang; Leiming Zhang; Xun Wang; Wei Yuan; Hui Zhang; Tao Peng; Xinbin Feng. 2021. "Mass balance of nine trace elements in two karst catchments in southwest China." Science of The Total Environment 786, no. : 147504.
Land surface emissions are an important source of atmospheric total gaseous mercury (TGM); however, its role on the variations of TGM isotopic compositions and concentrations has not been properly evaluated. In this study, TGM isotope compositions, a powerful tracer for sources and transformation of Hg, were measured at 10 urban sites and one rural site in China. TGM concentrations were higher in summer than in winter in most cities except in Guiyang and Guangzhou in the low latitudes. The summertime high TGM concentrations coincided with prevailing low TGM δ202Hg and high TGM Δ199Hg signatures. These seasonal patterns were in contrast with those typically observed in rural areas in the Northern Hemisphere, suggesting that atmospheric oxidation chemistry, vegetation activity and residential coal combustion were likely not the dominant mechanisms contributing to the TGM concentration and isotopic composition seasonality in Chinese cities. The amplitudes of seasonal variations in TGM concentrations and Δ199Hg (or TGM δ202Hg) were significantly positively (or negatively) correlated with that of the simulated soil GEM emission flux. These results suggest that the seasonal variations in TGM isotopic compositions and concentrations in the 10 Chinese cities were likely controlled by land surface emissions that were observed or reported with highly negative δ202Hg signatures.
Xuewu Fu; Chen Liu; Hui Zhang; Yue Xu; Jun Li; Xiaopu Lyu; Gan Zhang; Hai Guo; Xun Wang; Leiming Zhang; Xinbin Feng. Isotopic compositions of atmospheric total gaseous mercury in 10 Chinese cities and implications for land surface emissions. Atmospheric Chemistry and Physics 2021, 21, 6721 -6734.
AMA StyleXuewu Fu, Chen Liu, Hui Zhang, Yue Xu, Jun Li, Xiaopu Lyu, Gan Zhang, Hai Guo, Xun Wang, Leiming Zhang, Xinbin Feng. Isotopic compositions of atmospheric total gaseous mercury in 10 Chinese cities and implications for land surface emissions. Atmospheric Chemistry and Physics. 2021; 21 (9):6721-6734.
Chicago/Turabian StyleXuewu Fu; Chen Liu; Hui Zhang; Yue Xu; Jun Li; Xiaopu Lyu; Gan Zhang; Hai Guo; Xun Wang; Leiming Zhang; Xinbin Feng. 2021. "Isotopic compositions of atmospheric total gaseous mercury in 10 Chinese cities and implications for land surface emissions." Atmospheric Chemistry and Physics 21, no. 9: 6721-6734.
Methylmercury (MeHg) contaminated rice is a global issue, particularly in mercury-polluted areas, posing a potential threat to human health. The sources and transformations of mercury (Hg) species in rice are critical points that are not yet fully understood. In this study, field experimental pots together with a stable Hg isotope tracing technique were used to provide direct evidence of the sources and transformations of Hg species in rice plants. Enriched inorganic Hg (IHg) isotope (200Hg(NO3)2) was spiked into paddy soils, and the concentrations of inorganic Hg tracer (I200Hg), MeHg tracer (Me200Hg), and ambient Hg species (IHg and MeHg) were measured in the tissues of rice plants and their corresponding soil samples during the rice growing season. Here, we show that, in addition to the atmosphere, the soil is an important source of IHg to rice grains and was previously largely underestimated. We also show that MeHg is formed in paddy soil via microbial IHg methylation, absorbed through the rice root, translocated from the root to above-ground parts, and finally accumulated in rice grains. Although in vivo methylation of IHg in rice plants is unlikely to occur during the rice growing season, we observed in vivo demethylation of MeHg in the above-ground parts of rice plants, possibly via photolytic demethylation. Promoting in vivo demethylation of MeHg may be an effective approach to mitigate MeHg accumulation in rice grains.
Jiang Liu; Bo Meng; Alexandre.J. Poulain; Qiyi Meng; Xinbin Feng. Stable isotope tracers identify sources and transformations of mercury in rice (Oryza sativa L.) growing in a mercury mining area. Fundamental Research 2021, 1, 259 -268.
AMA StyleJiang Liu, Bo Meng, Alexandre.J. Poulain, Qiyi Meng, Xinbin Feng. Stable isotope tracers identify sources and transformations of mercury in rice (Oryza sativa L.) growing in a mercury mining area. Fundamental Research. 2021; 1 (3):259-268.
Chicago/Turabian StyleJiang Liu; Bo Meng; Alexandre.J. Poulain; Qiyi Meng; Xinbin Feng. 2021. "Stable isotope tracers identify sources and transformations of mercury in rice (Oryza sativa L.) growing in a mercury mining area." Fundamental Research 1, no. 3: 259-268.
Antimony (Sb), a priority pollutant listed by the U.S. Environmental Protection Agency (USEPA), can cause adverse effects on human health, with particular impacts on skin, eyes, gastrointestinal tract, and respiratory system. In this study, a database of Sb concentrations in the global atmosphere was developed through a survey of measurements published in more than 600 articles, which was then used to assess the health risks of Sb exposure based on a USEPA assessment model. Most measurements showed Sb concentrations of less than ∼10 ng m–3, but those at several contaminated sites exhibited Sb concentrations of more than 100 ng m–3. For measurements conducted in urban environments, Sb concentrations in the total suspended particles (TSP) and particles of less than 10 (PM10) or 2.5 μm (PM2.5) were the highest in Asia, followed by Europe, South America, and North America. Sb concentrations were generally higher in winter and fall than during other seasons in TSP and PM10 samples. A significant correlation was observed between Sb and As in TSP and PM2.5 on a global scale. Sb was mainly derived from anthropogenic sources, especially traffic emission, industrial emission, and fossil combustion. Hazard quotients (HQ) of Sb in TSP, PM10, and PM2.5 were higher for children than adults because of their lighter body weight, inferior physical resistance, and higher ingestion probability. The global database for atmospheric Sb concentrations demonstrates a relatively low noncarcinogenic risk in most regions. Long-term monitoring is still required to identify the sources and growth potentials of Sb so that effective control policies can be established.
Jiali Jiang; Yunjie Wu; Guangyi Sun; Leiming Zhang; ZhongGen Li; Jonas Sommar; Heng Yao; Xinbin Feng. Characteristics, Accumulation, and Potential Health Risks of Antimony in Atmospheric Particulate Matter. ACS Omega 2021, 6, 9460 -9470.
AMA StyleJiali Jiang, Yunjie Wu, Guangyi Sun, Leiming Zhang, ZhongGen Li, Jonas Sommar, Heng Yao, Xinbin Feng. Characteristics, Accumulation, and Potential Health Risks of Antimony in Atmospheric Particulate Matter. ACS Omega. 2021; 6 (14):9460-9470.
Chicago/Turabian StyleJiali Jiang; Yunjie Wu; Guangyi Sun; Leiming Zhang; ZhongGen Li; Jonas Sommar; Heng Yao; Xinbin Feng. 2021. "Characteristics, Accumulation, and Potential Health Risks of Antimony in Atmospheric Particulate Matter." ACS Omega 6, no. 14: 9460-9470.
The River Nile is the primary source of freshwater for drinking, irrigation, and industrial purposes in Egypt. Thus, the water quality in this river concerns the health of local inhabitants. The present study reveals seasonal variations of various physicochemical and heavy metals parameters and microbial load of water at 15 sites from Qena to Sohag cities, Egypt. The water is fresh with TDS ≤ 270 and 410 mg L−1 in summer and winter, respectively. Fe, Mn, Cd, Cr, Cu, Ni, and Zn concentrations were within drinking water specification in both seasons except Cr and Cd in summer. Viable numbers of total coliform, fecal coliform, and fecal streptococci were recorded in both seasons with fecal streptococci's disappearing in winter. The concentrations of salts and ions in winter were higher than summer due to decreased water quantity and flow rate in this season. On the other hand, heavy metals and bacteria were higher in summer owing to the rain and weathering of upstream rocks and increasing of human activities during the summer. The calculated water quality index (WQI) depicted that the chemical quality of water was poor for drinking and treatment, especially biological treatment, which is required before the water is supplied for drinking. Human health risk assessment factors such as probable daily intake, hazard quotient, and carcinogenic risk indicated high risks of Cr, Cd, and Ni for adults and children in both seasons. The non-carcinogenic and carcinogenic risks are mainly posed by Cr. The WQI values for the other water uses indicated the marginal quality for aquatic life, fair for irrigation, and fair in summer to good in winter for livestock consumption. The irrigation water quality parameters indicated that the water could be used to irrigate all soils and crops except the hazard of biological contamination. The water–rock interaction controls water chemistry besides the contribution of human activities. The agricultural, industrial, and municipal wastewaters were the main contributors to water pollution and should be treated before discharge into the Nile River. Source and drinking water should be monitored continuously to prevent related human waterborne diseases.
Mahmoud A. Abdelhafiz; Ahmed A. Elnazer; El-Montser M. Seleem; Alaa Mostafa; Ahmed G. Al-Gamal; Salman A. Salman; Xinbin Feng. Chemical and bacterial quality monitoring of the Nile River water and associated health risks in Qena–Sohag sector, Egypt. Environmental Geochemistry and Health 2021, 1 -16.
AMA StyleMahmoud A. Abdelhafiz, Ahmed A. Elnazer, El-Montser M. Seleem, Alaa Mostafa, Ahmed G. Al-Gamal, Salman A. Salman, Xinbin Feng. Chemical and bacterial quality monitoring of the Nile River water and associated health risks in Qena–Sohag sector, Egypt. Environmental Geochemistry and Health. 2021; ():1-16.
Chicago/Turabian StyleMahmoud A. Abdelhafiz; Ahmed A. Elnazer; El-Montser M. Seleem; Alaa Mostafa; Ahmed G. Al-Gamal; Salman A. Salman; Xinbin Feng. 2021. "Chemical and bacterial quality monitoring of the Nile River water and associated health risks in Qena–Sohag sector, Egypt." Environmental Geochemistry and Health , no. : 1-16.
The accuracy of mercury (Hg) dendrochemistry has been questioned because significant knowledge gaps exist in understanding the Hg translocation and mobility in tree-ring. In this study, we evaluated Hg concentrations and isotopic profiles in the tree-ring at a Hg artisanal mining site and a control site with the documented local Hg production inventory. Results show that the Hg concentration accumulated in tree-ring fails to reconstruct the temporal trend of Hg production due to confounded tree physiological and environmental factors, specifically, the radial translocation and tree age effects occurring during the fast-growing period. The temporal profiles of δ202Hg exhibit pronounced tree-specific variabilities due to the complexity of Hg isotopic mass dependent fractionation during atmospheric Hg uptake and translocation in vegetation. The Hg odd-MIF (mass independent fractionation) profiles in tree-ring can reconstruct a decadal-scale temporal trend of the atmospheric Hg0 pollution level, and also be used as a tracer to distinguish the emission source shifts of atmospheric Hg0. However, the radial translocation would result in uncertainties at the higher resolution because of the mixing of odd-MIF signatures with active rings. Caution should be taken and additional supporting evidence collected from independent methods should be used for verifying the tree-ring records.
Xun Wang; Wei Yuan; Che-Jen Lin; Fei Wu; Xinbin Feng. Stable mercury isotopes stored in Masson Pinus tree rings as atmospheric mercury archives. Journal of Hazardous Materials 2021, 415, 125678 .
AMA StyleXun Wang, Wei Yuan, Che-Jen Lin, Fei Wu, Xinbin Feng. Stable mercury isotopes stored in Masson Pinus tree rings as atmospheric mercury archives. Journal of Hazardous Materials. 2021; 415 ():125678.
Chicago/Turabian StyleXun Wang; Wei Yuan; Che-Jen Lin; Fei Wu; Xinbin Feng. 2021. "Stable mercury isotopes stored in Masson Pinus tree rings as atmospheric mercury archives." Journal of Hazardous Materials 415, no. : 125678.
Coal-fired power plants (CFPPs) are an important anthropogenic mercury (Hg) source in China, and it is crucial to understand the environmental impacts of this detrimental element emitted from this source. In the present study, field experiments were conducted for measuring Hg in ambient atmosphere and upland agricultural soils within a radius of 10 km surrounding a large scale coal-fired power plant (1550 MW) in Tangshan, Hebei province. Short-term (20 min) average of gaseous elemental mercury (GEM or Hg0) in ambient air varying from 1.5 to 9.0 ng/m3 and total Hg (THg) in surface agricultural soil (0–20 cm) varying from 9.2 to 43.5 μg/kg at different sites were observed. THg in two soil cores decreased with depth, with concentrations being 2–2.5 times higher in the surface layer than that in the deep layer (50–60 cm), indicating the possibility of the atmospheric input of Hg. Based on the information of the total atmospheric Hg emission since this CFPP’s operation in 1970s and the increased THg in nearby soils, it was estimated that about 3.9% discharged Hg has accumulated in the nearby agricultural soils. The low retention rate of the total emitted Hg by soils is a result of high proportion of Hg0 (79.5%) in stack gas emission and potential loss of Hg from soil surface reemission. The positive shifting (~ 0.5‰) of Hg isotopic signature (δ202Hg) from deep soil to surface soil reflected Hg deposition from nearby CFPP emissions that are featured with much heavier Hg isotopic signatures inherited from feed coal (δ202Hg: –0.50‰) and different combustion products (δ202Hg: –0.95 to 3.71‰) compared with that in deep soil layer (δ202Hg: ca –1.50‰). Overall, this study demonstrated that this CFPP has a slight but distinguishable effect on the elevation of ambient GEM and agricultural soil THg in the local environment.
ZhongGen Li; Xufeng Chen; Wenli Liu; Taishan Li; Guangle Qiu; Haiyu Yan; Mingmeng Wang; Ji Chen; Guangyi Sun; Qingfeng Wang; Xinbin Feng. Soil and ambient air mercury as an indicator of coal-fired power plant emissions: a case study in North China. Environmental Science and Pollution Research 2021, 28, 33146 -33157.
AMA StyleZhongGen Li, Xufeng Chen, Wenli Liu, Taishan Li, Guangle Qiu, Haiyu Yan, Mingmeng Wang, Ji Chen, Guangyi Sun, Qingfeng Wang, Xinbin Feng. Soil and ambient air mercury as an indicator of coal-fired power plant emissions: a case study in North China. Environmental Science and Pollution Research. 2021; 28 (25):33146-33157.
Chicago/Turabian StyleZhongGen Li; Xufeng Chen; Wenli Liu; Taishan Li; Guangle Qiu; Haiyu Yan; Mingmeng Wang; Ji Chen; Guangyi Sun; Qingfeng Wang; Xinbin Feng. 2021. "Soil and ambient air mercury as an indicator of coal-fired power plant emissions: a case study in North China." Environmental Science and Pollution Research 28, no. 25: 33146-33157.
To disclose possible influencing factors on mercury (Hg) contents in flue gas desulfurization (FGD) gypsum of coal-fired power plants (CFPPs), 11 major CFPPs in Guizhou province of southwest China were surveyed for analyzing Hg contents in feed coal, limestone and gypsum as well as coal properties. It was found that Hg contents in the desulfurization gypsum of the 11 CFPPs varied greatly from 160 to 1482 μg kg−1, with an average of 595 ± 353 μg kg−1. The majority of Hg in gypsum was introduced from the flue gas downstream of the particulate matter control devices, while a much lesser portion (average 3.43 ± 3.85%) was stemmed from limestone. Hg content in gypsum has a strong positive correlation with chlorine content, a weak positive correlation with Hg content and a weak negative correlation with sulfur content in feed coal. Multiple regression analysis results showed that Hg and Cl contents in feed coal were the major determinants of Hg content in flue gas FGD gypsum despite the proportioning of Hg went in wet FGD system was not been evaluated. Results from the present study suggested that coal characteristics are important factors affecting Hg contents in gypsum.
Qingfeng Wang; Dan Wang; ZhongGen Li; Leiming Zhang; Xinbin Feng. Mercury in desulfurization gypsum and its dependence on coal properties in coal-fired power plants. Fuel 2021, 293, 120413 .
AMA StyleQingfeng Wang, Dan Wang, ZhongGen Li, Leiming Zhang, Xinbin Feng. Mercury in desulfurization gypsum and its dependence on coal properties in coal-fired power plants. Fuel. 2021; 293 ():120413.
Chicago/Turabian StyleQingfeng Wang; Dan Wang; ZhongGen Li; Leiming Zhang; Xinbin Feng. 2021. "Mercury in desulfurization gypsum and its dependence on coal properties in coal-fired power plants." Fuel 293, no. : 120413.
Indigenous zinc smelting (IZS) is a backward technique that releases a great deal of heavy metal(loid)s into the environment. However, the contamination of heavy metal(loid)s in ground dust and the associated health risks in such areas are poorly known. In this study, a former IZS area in Guizhou, China, was surveyed during 2008–2018 with 15 elements (Ag, As, Bi, Cd, Co, Cr, Cu, Hg, In, Ni, Pb, Sb, Sn, Tl, Zn) being analyzed. The results indicate that most elements (e.g., Ag, As, Cd, Cu, Pb, Sb, Sn, Zn) in ground dust decreased significantly after the cessation of the IZS in 2006; nevertheless, some elements still remained at relatively high levels in 2018, e.g., Pb (average: 762 ± 647 mg/kg), Zn (average: 1,287 ± 753 mg/kg), Cd (average: 7.76 ± 5.06 mg/kg), and As (average: 41.9 ± 34.8 mg/kg), indicating they might come from the local contaminated soils, slag residues and smelting potteries. In terms of the impacts on human health, children have both higher non-carcinogenic and carcinogenic risks than that of adults, with the latter subpopulation having a lower risk than the threshold values. Pb and As were the two elements with the highest non-carcinogenic risk for children, the hazard index of local children was still higher than the threshold of 1 (e.g., 1.43 for As, 2.09 for Pb) in 2018. The carcinogenic risk of As exposure to children dropped more than two times to 6.42 × 10−7 in 2018, which falls below the tolerable range (10−6–10−4). This study revealed that although the concentration of heavy metal(loid)s in ground dust and linked health risk in the IZS area has reduced dramatically after the cessation of IZS, continued removal of slag residues and smelting potteries is necessary for further decreasing the human health risk.
Shan Li; Xiangyang Bi; ZhongGen Li; Heng Wang; Xinyu Li; Xinbin Feng; Guangyi Sun; Ji Chen; Bo Meng. Heavy Metal(loid)s Contamination in Ground Dust and Associated Health Risks at a Former Indigenous Zinc Smelting Area. International Journal of Environmental Research and Public Health 2021, 18, 893 .
AMA StyleShan Li, Xiangyang Bi, ZhongGen Li, Heng Wang, Xinyu Li, Xinbin Feng, Guangyi Sun, Ji Chen, Bo Meng. Heavy Metal(loid)s Contamination in Ground Dust and Associated Health Risks at a Former Indigenous Zinc Smelting Area. International Journal of Environmental Research and Public Health. 2021; 18 (3):893.
Chicago/Turabian StyleShan Li; Xiangyang Bi; ZhongGen Li; Heng Wang; Xinyu Li; Xinbin Feng; Guangyi Sun; Ji Chen; Bo Meng. 2021. "Heavy Metal(loid)s Contamination in Ground Dust and Associated Health Risks at a Former Indigenous Zinc Smelting Area." International Journal of Environmental Research and Public Health 18, no. 3: 893.
Karst regions have long been recognised as landscapes of ecological vulnerability, however the mass balance and fate of mercury (Hg) in karst regions have not been well documented. This study focused on the largest contiguous karst area in China and investigated Hg mass balance in two catchments, one with high geological Hg (Huilong) and the other representative of regional background Hg (Chenqi). The mass balance of Hg was calculated separately for the two catchments by considering Hg in throughfall, open field precipitation, total suspended particulate matter (TSP), litterfall, fertilizer, crop harvesting, air-surface Hg0 exchange, surface runoff and underground runoff. Results show that litterfall Hg deposition is the largest loading (from atmosphere) of Hg in both catchments, accounting for 61.5% and 38.5% of the total Hg input at Huilong and Chenqi, respectively. Air-surface Hg0 exchange is the largest efflux, accounting for 71.7% and 44.6% of the total Hg output from Huilong and Chenqi, respectively. Because both catchments are subject to farm and forest land use, cultivation plays an important role in shaping Hg fate. Mercury loading through fertilizer was ranked as the second largest input (28.5%) in Chenqi catchment and Hg efflux through crop harvest was ranked as the second largest output pathway in both Huilong (27.0%) and Chenqi (52.9%). The net Hg fluxes from the catchments are estimated to be 1498 ± 1504 μg m−2 yr−1 and 4.8 ± 98.2 μg m−2 yr−1. The significantly greater magnitude of net Hg source in Huilong is attributed to higher air-surface Hg0 exchange. The output/input ratio of Hg in this study was much greater than has been reported for other forest or agricultural ecosystems and indicates that the karst region of Southwest China is a significant source of atmospheric Hg. The results of this study should be considered in the development of pollution control policies which seek to conserve fragile karst ecosystems characterised by high geological background of Hg.
Jicheng Xia; Jianxu Wang; Leiming Zhang; Xun Wang; Wei Yuan; Christopher W.N. Anderson; Chaoyue Chen; Tao Peng; Xinbin Feng. Significant mercury efflux from a Karst region in Southwest China - Results from mass balance studies in two catchments. Science of The Total Environment 2021, 769, 144892 .
AMA StyleJicheng Xia, Jianxu Wang, Leiming Zhang, Xun Wang, Wei Yuan, Christopher W.N. Anderson, Chaoyue Chen, Tao Peng, Xinbin Feng. Significant mercury efflux from a Karst region in Southwest China - Results from mass balance studies in two catchments. Science of The Total Environment. 2021; 769 ():144892.
Chicago/Turabian StyleJicheng Xia; Jianxu Wang; Leiming Zhang; Xun Wang; Wei Yuan; Christopher W.N. Anderson; Chaoyue Chen; Tao Peng; Xinbin Feng. 2021. "Significant mercury efflux from a Karst region in Southwest China - Results from mass balance studies in two catchments." Science of The Total Environment 769, no. : 144892.
Thallium (Tl) is a toxic element that exists at trace level in coal. Coal-fired power plants (CFPPs) consume large amounts of coal and can potentially release this element into surrounding environment. However, knowledge of fates of Tl inside CFPPs and associated atmospheric emissions is still very limited. In this study, five CFPPs with pulverized coal boilers (PC) in Guizhou province, southwest China were selected for investigation. All input and output solid materials and the stack flue gas samples were collected simultaneously. Tl concentrations in feed coal (0.10-0.34 mg·kg−1) of the five CFPPS were only a third to one half of the national average value. Tl concentrations were obviously higher in fly ash (0.39-1.13 mg·kg−1) than bottom ash (0.09-0.25 mg·kg−1), indicating notable redistribution of Tl during coal combustion. Tl concentrations were low in limestone (0.01-0.02 mg·kg−1), flue gas desulfurization gypsum (0.01-0.03 mg·kg−1), and the stack flue gas (0.006-0.011 μg·Nm−3). Most Tl inside these CFPPs was captured by electrostatic precipitator or electrostatic precipitator-fabric filter fly ash (88.66 - 97.44%), followed by bottom ash (2.13-10.73%), gypsum (<3.89%), and stack emissions (0.01-0.05%). Atmospheric emission factors of Tl from different CFPPs are in the range of 0.04-0.09 mg Tl·t−1 coal, 0.02-0.04 μg·(kW·h)−1 or 0.002-0.004 g Tl·TJ−1. Using these emission factors, a total of 3.96 ± 1.32 kg (range: 2.64-5.94 kg) Tl is estimated to be released into the atmosphere annually from CFPPs in Guizhou in 2017. To avoid the cross-media contamination from the combustion products, careful treatment of the captured fly ash, bottom ash, and gypsum is needed, considering that a large amount of Tl (average: 728 kg·yr−1; range: 664-792 kg·yr−1) is retained in these solid combustion products and the possibility of formation of more toxic Tl3+ during the combustion process. Graphical Abstract
ZhongGen Li; Xian Zhou; Qingfeng Wang; Xinyu Li; Leiming Zhang; Dan Wang; Tianrong He; Yu Cao; Xinbin Feng. Behavior of thallium in pulverized coal utility boiler installations in Southwest China. Journal of the Air & Waste Management Association 2021, 71, 488 -500.
AMA StyleZhongGen Li, Xian Zhou, Qingfeng Wang, Xinyu Li, Leiming Zhang, Dan Wang, Tianrong He, Yu Cao, Xinbin Feng. Behavior of thallium in pulverized coal utility boiler installations in Southwest China. Journal of the Air & Waste Management Association. 2021; 71 (4):488-500.
Chicago/Turabian StyleZhongGen Li; Xian Zhou; Qingfeng Wang; Xinyu Li; Leiming Zhang; Dan Wang; Tianrong He; Yu Cao; Xinbin Feng. 2021. "Behavior of thallium in pulverized coal utility boiler installations in Southwest China." Journal of the Air & Waste Management Association 71, no. 4: 488-500.
Land surface emissions are an important source of atmospheric total gaseous mercury (TGM), however, its role on the variations of TGM isotopic compositions and concentrations has not been properly evaluated. In this study, TGM isotope compositions, a powerful tracer for sources and transformation of Hg, were measured at ten urban sites and one rural site in China. TGM concentrations were higher in summer than in winter in most cities except in Guiyang and Guangzhou in the low latitudes. The summertime high TGM concentrations were coincided with prevailing low TGM δ202Hg and high TGM Δ199Hg signatures. These seasonal patterns were in contrast with those typically observed in rural areas in the Northern Hemisphere, suggesting atmospheric oxidation chemistry, vegetation activity as well as residential coal combustion were not likely the dominant mechanisms contributing to the TGM concentration and isotopic composition seasonality in Chinese cities. The amplitudes of seasonal variations in TGM concentrations and Δ199Hg (or TGM δ202Hg) were significantly positively (or negatively) correlated with that of the simulated soil GEM emission flux. These results suggest that the seasonal variations in TGM isotopic compositions and concentrations in the ten Chinese cities were likely controlled by land surface emissions that were observed or reported with highly negative δ202Hg signatures.
Xuewu Fu; Chen Liu; Hui Zhang; Yue Xu; Jun Li; Xiaopu Lyu; Gan Zhang; Hai Guo; Xun Wang; Leiming Zhang; Xinbin Feng. Isotopic compositions of atmospheric total gaseous mercury in ten Chinese cities and implications for land surface emissions. 2021, 2021, 1 -28.
AMA StyleXuewu Fu, Chen Liu, Hui Zhang, Yue Xu, Jun Li, Xiaopu Lyu, Gan Zhang, Hai Guo, Xun Wang, Leiming Zhang, Xinbin Feng. Isotopic compositions of atmospheric total gaseous mercury in ten Chinese cities and implications for land surface emissions. . 2021; 2021 ():1-28.
Chicago/Turabian StyleXuewu Fu; Chen Liu; Hui Zhang; Yue Xu; Jun Li; Xiaopu Lyu; Gan Zhang; Hai Guo; Xun Wang; Leiming Zhang; Xinbin Feng. 2021. "Isotopic compositions of atmospheric total gaseous mercury in ten Chinese cities and implications for land surface emissions." 2021, no. : 1-28.
Microaerophilic Fe(II)-oxidizing bacteria are often chemolithoautotrophs, and the Fe(III) (oxyhydr)oxides they form could immobilize arsenic (As). If such microbes are active in karstic paddy soils, their activity would help increase soil organic carbon and mitigate As contamination. We therefore used gel-stabilized gradient systems to cultivate microaerophilic Fe(II)-oxidizing bacteria from karstic paddy soil to investigate their capacity for Fe(II) oxidation, carbon fixation, and As sequestration. Stable isotope probing demonstrated the assimilation of inorganic carbon at a maximum rate of 8.02 mmol C m–2 d–1. Sequencing revealed that Bradyrhizobium, Cupriavidus, Hyphomicrobium, Kaistobacter, Mesorhizobium, Rhizobium, unclassified Phycisphaerales, and unclassified Opitutaceas were fixing carbon. Fe(II) oxidation produced Fe(III) (oxyhydr)oxides, which can absorb and/or coprecipitate As. Adding As(III) decreased the diversity of functional bacteria involved in carbon fixation, the relative abundance of predicted carbon fixation genes, and the amount of carbon fixed. Although the rate of Fe(II) oxidation was also lower in the presence of As(III), over 90% of the As(III) was sequestered after oxidation. The potential for microbially mediated As(III) oxidation was revealed by the presence of arsenite oxidase gene (aioA), denoting the potential of the Fe(II)-oxidizing and autotrophic microbial community to also oxidize As(III). Thisstudy demonstrates that carbon fixation coupled to Fe(II) oxidation can increase the carbon content in soils by microaerophilic Fe(II)-oxidizing bacteria, as well as accelerate As(III) oxidation and sequester it in association with Fe(III) (oxyhydr)oxides.
Hui Tong; Chunju Zheng; Bing Li; Elizabeth D. Swanner; Chengshuai Liu; Manjia Chen; Yafei Xia; Yuhui Liu; Zengping Ning; Fangbai Li; Xinbin Feng. Microaerophilic Oxidation of Fe(II) Coupled with Simultaneous Carbon Fixation and As(III) Oxidation and Sequestration in Karstic Paddy Soil. Environmental Science & Technology 2021, 55, 3634 -3644.
AMA StyleHui Tong, Chunju Zheng, Bing Li, Elizabeth D. Swanner, Chengshuai Liu, Manjia Chen, Yafei Xia, Yuhui Liu, Zengping Ning, Fangbai Li, Xinbin Feng. Microaerophilic Oxidation of Fe(II) Coupled with Simultaneous Carbon Fixation and As(III) Oxidation and Sequestration in Karstic Paddy Soil. Environmental Science & Technology. 2021; 55 (6):3634-3644.
Chicago/Turabian StyleHui Tong; Chunju Zheng; Bing Li; Elizabeth D. Swanner; Chengshuai Liu; Manjia Chen; Yafei Xia; Yuhui Liu; Zengping Ning; Fangbai Li; Xinbin Feng. 2021. "Microaerophilic Oxidation of Fe(II) Coupled with Simultaneous Carbon Fixation and As(III) Oxidation and Sequestration in Karstic Paddy Soil." Environmental Science & Technology 55, no. 6: 3634-3644.