Spectral insight into thiosulfate-induced mercury speciation transformation in a historically polluted soil | |
Ting Liu; Jianxu Wang; Xinbin Feng; Hua Zhang; Zongqiang Zhu; Shenggao Cheng | |
2019 | |
发表期刊 | Science of The Total Environment |
卷号 | 657页码:938-944 |
摘要 | We studied the effect of different doses (0.5%, 2% and 5% (w/w)) of ammonium thiosulfate on mercury (Hg) speciation fractionation following its addition to the soil, as well as its accumulation by oilseed rape (Brassica napus L.), corn (Zea mays L.), and sweet potato (Ipomoea batatas L.), and compared them to a non-treated control in a historically polluted soil. The oilseed rape, corn, and sweet potato were planted consecutively in the same soils on days 30, 191, and 276, respectively after the addition of thiosulfate to the soil. The key results showed that bioavailable Hg contents in the rhizosphere soils ranged from 0.18 to 2.54 μg kg−1, 0.28 to 2.77 μg kg−1, and 0.24 to 2.22 μg kg−1, respectively, for the 0.5%, 2% and 5% thiosulfate treatments, which were close to the control soil (0.25 to 1.98 μg kg−1). The Hg L3-edge X-ray absorption near edge structure (XANES) results showed a tendency of the Hg speciation to transform from the Hg(SR)2 (initial soil, 56%; day-191 soil, 43%; day-276 soil, 46%, and day-356 soil, 16%) to nano particulated HgS (initial soil, 26%; day-191 soil, 42%; day-276 soil, 42%, and day-356 soil, 73%) with time in the soil treated with a 5% dose of thiosulfate. The Hg contents in the tissues of the crops, except for oilseed rape, were slightly affected by the addition of thiosulfate to the soil at all dosages, compared to the control. The addition of thiosulfate did not induce the movement of bioavailable Hg to the lower layer of the soil profile. We conclude a promotion of Hg immobilization by thiosulfate in the soil for over one year, offering a promising method for in-situ Hg remediation at Hg mining regions in China. |
关键词 | Thiosulfate mercury Fractionation bioavailability environment Risk Management |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/10238 |
专题 | 环境地球化学国家重点实验室 |
作者单位 | 1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, PR China 2.University of Chinese Academy of Sciences, Beijing 100049, China 3.Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China 4.China University of Geosciences, Wuhan 430074, China |
推荐引用方式 GB/T 7714 | Ting Liu,Jianxu Wang,Xinbin Feng,et al. Spectral insight into thiosulfate-induced mercury speciation transformation in a historically polluted soil[J]. Science of The Total Environment,2019,657:938-944. |
APA | Ting Liu,Jianxu Wang,Xinbin Feng,Hua Zhang,Zongqiang Zhu,&Shenggao Cheng.(2019).Spectral insight into thiosulfate-induced mercury speciation transformation in a historically polluted soil.Science of The Total Environment,657,938-944. |
MLA | Ting Liu,et al."Spectral insight into thiosulfate-induced mercury speciation transformation in a historically polluted soil".Science of The Total Environment 657(2019):938-944. |
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