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Characteristics, speciation, and bioavailability of mercury and methylmercury impacted by an abandoned coal gangue in southwestern China
Longchao Liang;   Xiaohang Xu;   Jialiang Han;   Zhidong Xu;   Pan Wu;   Jianyang Guo;  Guangle Qiu
2019
Source PublicationEnvironmental Science and Pollution Research
Volume26Pages:37001–37011
Abstract

During coal mining activities, a lot of coal gangue is produced, which usually contains high mercury (Hg) concentrations as well as the acid mine drainage (AMD) generator of pyrite. In the present study, the total mercury (THg) and methylmercury (MeHg) in gangue, water, sediment, paddy soil, and rice samples, collected from abandoned coal mining areas, were analyzed. Results showed that the THg concentrations ranged from 0.37 to 35 mg/kg (11 ± 8.4 mg/kg) and 0.15 to 19 mg/kg (2.0 ± 3.9 mg/kg) in gangue and sediments, respectively. For paddy soils, the THg concentrations and MeHg varied from 0.16 to 0.91 mg/kg and 0.71 to 11 ng/g, respectively. Rice samples exhibited wide concentration ranges of THg (3.0–22 ng/g) and MeHg (0.71–8.9 ng/g). Sequential extraction of Hg revealed that the nitric acid-extractable state Hg (F4) was the dominant Hg species in gangue and sediment, while humic acids state Hg (F3) was the dominant form in paddy soil. Compared with gangue, higher percentages of F3 and the residual state Hg (F5) in both sediment and soil samples implied the transformation of F4 to F3 and F5 during transportation. Soil n-HAs (the difference between the total organic carbon and humic acids) were positively correlated with both THg and MeHg in soil and rice, indicating that n-HAs enhance Hg bioavailability under acidic conditions. Further studies should be conducted to reveal the factors influencing the transformation of different Hg fractions, providing ideas on decreasing the bioavailability of Hg in coal mining areas.

KeywordTotal Mercury Methylmercury Mercury Speciation Biogeochemsitry Influencing Factors Coal Mining Activities
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10148
Collection环境地球化学国家重点实验室
Affiliation1.College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Key laboratory of Karst Environment and Geohazard, Ministry of Land and Resources, Guiyang 550025, China
Recommended Citation
GB/T 7714
Longchao Liang; Xiaohang Xu; Jialiang Han; Zhidong Xu; Pan Wu; Jianyang Guo;Guangle Qiu. Characteristics, speciation, and bioavailability of mercury and methylmercury impacted by an abandoned coal gangue in southwestern China[J]. Environmental Science and Pollution Research,2019,26:37001–37011.
APA Longchao Liang; Xiaohang Xu; Jialiang Han; Zhidong Xu; Pan Wu; Jianyang Guo;Guangle Qiu.(2019).Characteristics, speciation, and bioavailability of mercury and methylmercury impacted by an abandoned coal gangue in southwestern China.Environmental Science and Pollution Research,26,37001–37011.
MLA Longchao Liang; Xiaohang Xu; Jialiang Han; Zhidong Xu; Pan Wu; Jianyang Guo;Guangle Qiu."Characteristics, speciation, and bioavailability of mercury and methylmercury impacted by an abandoned coal gangue in southwestern China".Environmental Science and Pollution Research 26(2019):37001–37011.
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