| Implications of Mercury Speciation in Thiosulfate Treated Plants | |
Jianxu Wang; Xinbin Feng ; Christopher W. N. Anderson; Heng Wang; Lirong Zheng; Tiandou Hu
| |
| Corresponding Author | Xinbin Feng |
| 2012 | |
| Source Publication | Environmental Science and Technology
 |
| Volume | 46Issue:10Pages:5361-5368 |
| Abstract | Mercury uptake was induced in two cultivars of Brassica juncea under field conditions using thiosulfate. Analysis was conducted to better understand the mechanism of uptake, speciation of mercury in plants, and redistribution of mercury in the soil. Plant mercury and sulfur concentrations were increased after thiosulfate treatment, and a linear correlation between mercury and sulfur was observed. Mercury may be absorbed and transported in plants as the Hg-thiosulfate complex. The majority of mercury in treated plant tissues (two cultivars) was bound to sulfur in a form similar to beta-HgS (66-94%). Remaining mercury was present in forms similar to Hg-cysteine (1-10%) and Hgdicysteine (8-28%). The formation of beta-HgS may relate to the transport and assimilation of sulfate in plant tissues. Mercury-thiosulfate complex could decompose to mercuric and sulfate ions in the presence of free protons inside the plasma membrane, while sulfide ions would be produced by the assimilation of sulfate. The concomitant presence of mercuric ions and S' would precipitate beta-HgS. The mercury concentration in the rhizosphere decreased in the treated relative to the nontreated soil. The iron/manganese oxide and organic-bound fractions of soil mercury were transformed to more bioavailable forms (soluble and exchangeable and specifically sorbed) and taken up by plants. |
| Subject Area | 环境地球化学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/4844 |
| Collection | 环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文 环境地球化学国家重点实验室 |
| Corresponding Author | Xinbin Feng |
| Recommended Citation GB/T 7714 | Jianxu Wang,Xinbin Feng,Christopher W. N. Anderson,et al. Implications of Mercury Speciation in Thiosulfate Treated Plants[J]. Environmental Science and Technology,2012,46(10):5361-5368. |
| APA | Jianxu Wang,Xinbin Feng,Christopher W. N. Anderson,Heng Wang,Lirong Zheng,&Tiandou Hu.(2012).Implications of Mercury Speciation in Thiosulfate Treated Plants.Environmental Science and Technology,46(10),5361-5368. |
| MLA | Jianxu Wang,et al."Implications of Mercury Speciation in Thiosulfate Treated Plants".Environmental Science and Technology 46.10(2012):5361-5368. |
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