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Chemically-assisted phytoextraction from metal(loid)s-polluted soil at a typical carlin-type gold mining area in southwest China
Jianxu Wang;  Ying Xing;  Ping Li;  Jicheng Xia;  Ting Liu;  Xinbin Feng
2018
Source PublicationJournal of Cleaner Production
Volume189Pages:612-619
Abstract

Laowuchang (LWC) gold mine, located in Southwest China, is a typical Carlin-type gold deposit with the characteristic Au-As-Sb-Tl trace elements assemblage. This study focuses on the mobilization of arsenic (As), antimony (Sb), and thallium (TI) in polluted soils collected from LWC mining sites and the influence of adding ammonium thiosulfate in different chelant to soil ratio (0, 0.5 and 2 g kg(-1)) on the efficacy of As, Sb and T1 phytoextraction by Brassica juncea. The soluble metal(loid)s in the soils after harvesting plants was studied to understand the potential of phytoextraction in managing the risk of metal(loid)s dispersion. Results show that the soils contained relatively high concentration of soluble As (3.6 similar to 5.5 mg kg(-1)) and low concentration of soluble Sb (40 similar to 128 mu g kg(-1)) and T1 (6.2 similar to 10 mu g kg(-1)). The level of soluble As in the soils is toxic to the environment according to the Chinese environmental quality standard for irrigation water (GB 5084-92). The key results from phytoextraction experiment were that addition of thiosulfate enhanced As and Sb accumulation in B. juncea compared to the control, and the maximum As and Sb uptake in the roots and shoots occurred in the treatment of 2 g thiosulfate kg(-1) of soil. However, application of thiosulfate inhibited plant uptake of TI. The concentration of soluble As in 2 g kg(-1) thiosulfate treatment was decreased significantly compared with the control and initial soils. Compared with the initial soils, soluble Sb was increased both in non-treated (control) and treated soils. However, no noticeable difference was observed between the soils of non-treated and treated plants. Both plant growth and thiosulfate amendment increased the soluble T1 in the soil, when compared to the initial soil. We conclude that thiosulfate-assisted phytoextraction might be used to reduce the environmental risk apparent for LWC soil through reducing the soluble As fractions, while managing the soluble fractions of Sb (compared with control soil). Meantime, further studies are required to manage the Tl risk in the soils at LWC mining site. 

KeywordThiosulfate phytoextraction metal(Loid)S environmental Risk
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8773
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550082, PR China
2.School of Chemistry and Materials Science, Guizhou Normal University, Guiyang, 550001, China
3.University of Chinese Academy of Sciences, Beijing, 100049, China
Recommended Citation
GB/T 7714
Jianxu Wang;Ying Xing;Ping Li;Jicheng Xia;Ting Liu;Xinbin Feng. Chemically-assisted phytoextraction from metal(loid)s-polluted soil at a typical carlin-type gold mining area in southwest China[J]. Journal of Cleaner Production,2018,189:612-619.
APA Jianxu Wang;Ying Xing;Ping Li;Jicheng Xia;Ting Liu;Xinbin Feng.(2018).Chemically-assisted phytoextraction from metal(loid)s-polluted soil at a typical carlin-type gold mining area in southwest China.Journal of Cleaner Production,189,612-619.
MLA Jianxu Wang;Ying Xing;Ping Li;Jicheng Xia;Ting Liu;Xinbin Feng."Chemically-assisted phytoextraction from metal(loid)s-polluted soil at a typical carlin-type gold mining area in southwest China".Journal of Cleaner Production 189(2018):612-619.
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