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Coal-seam fire is a source of atmospheric mercury that is difficult to control. The Wuda Coalfield in Inner Mongolia, China, is one of the most severe coal fire disaster areas worldwide and has been burning for more than 50 years. To investigate atmospheric mercury pollution from the Wuda coal fire, gaseous elemental mercury (GEM) concentrations and atmospheric particulate mercury (PHg) speciation were measured using a RA-915+ mercury analyzer and the temperature-programmed desorption method. Near-surface GEM concentrations in the Wuda Coalfield and adjacent urban area were 80 ng m−3 (65–90 ng m−3) and 52 ng m−3 (25–95 ng m−3), respectively, which are far higher than the local background value (22 ng m−3). PHg concentrations in the coalfield and urban area also reached significantly high levels, 33 ng m−3 (25–45 ng m−3) and 22 ng m−3 (14–29 ng m−3), respectively (p < 0.05). There is no clear evidence that PHg combines with organic carbon or elemental carbon, but PHg concentration appears to be controlled by air acidity. PHg mainly exists in inorganic forms, such as HgCl2, HgS, HgO, and Hg(NO3)2·H2O. This work can provide references for the speciation analysis of atmospheric PHg and the safety assessment of environmental mercury.
Yahui Qian; Yanci Liang; Qingyi Cao; Zhe Wang; Yunyun Shi; Handong Liang. Concentration and speciation of mercury in atmospheric particulates in the Wuda coal fire area, Inner Mongolia, China. Environmental Science and Pollution Research 2021, 1 -9.
AMA StyleYahui Qian, Yanci Liang, Qingyi Cao, Zhe Wang, Yunyun Shi, Handong Liang. Concentration and speciation of mercury in atmospheric particulates in the Wuda coal fire area, Inner Mongolia, China. Environmental Science and Pollution Research. 2021; ():1-9.
Chicago/Turabian StyleYahui Qian; Yanci Liang; Qingyi Cao; Zhe Wang; Yunyun Shi; Handong Liang. 2021. "Concentration and speciation of mercury in atmospheric particulates in the Wuda coal fire area, Inner Mongolia, China." Environmental Science and Pollution Research , no. : 1-9.
Microplastics pollution is becoming one of the most serious threats to the surface ecosystem of the earth; it is widespread in oceans, rivers, sediments, soils, and organisms. It is a growing concern as an environmental pollutant, which currently has no clear detection standard. Detection methods still need to be constantly supplemented and improved. This study explored a novel method called time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) in this field. Four types of microplastics in farmland soils, namely, polypropylene, polyvinyl chloride, polyethylene terephthalate, and polyamide 6, were successfully identified in terms of particle size and abundance by combining the high molecular specificity with ion imaging capability of ToF‐SIMS. The procedure based on ToF‐SIMS analysis also provides a methodological reference and basic data for the investigation and research of microplastics in soil, coastal beaches, and sediment.
Chuan Du; Jiang Wu; Jie Gong; Handong Liang; Zhanping Li. ToF‐SIMS characterization of microplastics in soils. Surface and Interface Analysis 2020, 52, 293 -300.
AMA StyleChuan Du, Jiang Wu, Jie Gong, Handong Liang, Zhanping Li. ToF‐SIMS characterization of microplastics in soils. Surface and Interface Analysis. 2020; 52 (5):293-300.
Chicago/Turabian StyleChuan Du; Jiang Wu; Jie Gong; Handong Liang; Zhanping Li. 2020. "ToF‐SIMS characterization of microplastics in soils." Surface and Interface Analysis 52, no. 5: 293-300.
Microplastics (MPs) are emerging pollutants that exist in different environmental media. Because of their wide range and large potential environmental hazards, they have attracted widespread attention in recent years. At present, the research on MP is mostly concentrated on the water ecosystems, and the impact on soil ecosystems is less studied. In this study, 12 typical soil samples from southeastern suburbs of Baoding city were investigated and characterized by time-of-flight secondary ion mass spectrometry (TOF-SIMS) combined with mass high resolution mode and positive and negative ion imaging mode. Four types of MPs, poly (propylene) (PP), poly (vinyl chloride) (PVC), poly (ethylene terephthalate) (PET), and poly (amide 6) (PA6), were quickly identified, of which PET and PA6 accounted for the largest proportion of both up to 30.2%; the particle size of the obtained MPs ranged from 0 to 35 μm, of which the proportion of <10 μm MPs was more than 26.3%, while that of 20–25 μm and 25–35 μm MPs was relatively small (17.83% and 9.3%, respectively). Risk assessment results of the MP in the soil showed that the risk level of MPs in the non-ferrous metal industrial parks and in concentrated with small workshops areas is relatively high, and attention should be paid to such areas. In addition, the study provides a reference method for the investigation and risk assessment of MPs in terrestrial soils, coastal beaches, and sediments.
Chuan Du; Handong Liang; Zhanping Li; Jie Gong. Pollution Characteristics of Microplastics in Soils in Southeastern Suburbs of Baoding City, China. International Journal of Environmental Research and Public Health 2020, 17, 845 .
AMA StyleChuan Du, Handong Liang, Zhanping Li, Jie Gong. Pollution Characteristics of Microplastics in Soils in Southeastern Suburbs of Baoding City, China. International Journal of Environmental Research and Public Health. 2020; 17 (3):845.
Chicago/Turabian StyleChuan Du; Handong Liang; Zhanping Li; Jie Gong. 2020. "Pollution Characteristics of Microplastics in Soils in Southeastern Suburbs of Baoding City, China." International Journal of Environmental Research and Public Health 17, no. 3: 845.