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Screening of chelating ligands to enhance mercury accumulation from historically mercury-contaminated soils for phytoextraction
Jianxu Wang;  Jicheng Xia;  Xinbin Feng
2017
Source PublicationJournal of Environmental Management
Volume186Issue:SIPages:233-239
Abstract

Screening of optimal chelating ligands which not only have high capacities to enhance plant uptake of mercury (Hg) from soil but also can decrease bioavailable Hg concentration in soil is necessary to establish a viable chemically-assisted phytoextraction. Therefore, Brassica juncea was exposed to historically Hg-contaminated soil (total Hg, 90 mg kg(-1)) to investigate the efficiency of seven chelating agents [ammonium thiosulphate, sodium thiosulphate, ammonium sulfate, ammonium chloride, sodium nitrate, ethylenediaminetetraacetic acid (EDTA), and sodium sulfite] at enhancing Hg phytoextraction; the leaching of bioavailable Hg caused by these chelating agents was also investigated. The Hg concentration in control (treated with double-distilled water) plant tissues was below 1 mg kg(-1). The remarkably higher Hg concentration was found in plants receiving ammonium thiosulphate and sodium sulfite treatments. The bioaccumulation factors and translocation factors of ammonium thiosulphate and sodium sulfite treatments were significantly higher than those of the other treatments. The more efficient uptake of Hg by plants upon treatment with ammonium thiosulphate and sodium sulfite compared to the other treatments might be explained by the formation of special Hg-thiosulphate complexes that could be preferentially taken up by the roots and transported in plant tissues. The application of sulfite significantly increased bioavailable Hg concentration in soil compared with that in initial soil and control soil, whereas ammonium thiosulphate significantly decreased bioavailable Hg concentration. The apparent decrease of bioavailable Hg in ammonium thiosulphate-treated soil compared with that in sodium sulfite-treated soil might be attributable to the unstable Hg-thiosulphate complexes formed between thiosulphate and Hg; they could react to produce less bioavailable Hg in the soil. The results of this study indicate that ammonium thiosulphate may be an optimal chelating ligand for phytoextraction due to its great potential to enhance Hg accumulation in plants while decreasing bioavailable Hg concentration in the soil. 

KeywordChelating Ligand Phytoextraction Bioavailable Mercury
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/7781
Collection环境地球化学国家重点实验室
Affiliation1.Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550002, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author Affilication中国科学院地球化学研究所
Corresponding Author Affilication中国科学院地球化学研究所
Recommended Citation
GB/T 7714
Jianxu Wang;Jicheng Xia;Xinbin Feng. Screening of chelating ligands to enhance mercury accumulation from historically mercury-contaminated soils for phytoextraction[J]. Journal of Environmental Management,2017,186(SI):233-239.
APA Jianxu Wang;Jicheng Xia;Xinbin Feng.(2017).Screening of chelating ligands to enhance mercury accumulation from historically mercury-contaminated soils for phytoextraction.Journal of Environmental Management,186(SI),233-239.
MLA Jianxu Wang;Jicheng Xia;Xinbin Feng."Screening of chelating ligands to enhance mercury accumulation from historically mercury-contaminated soils for phytoextraction".Journal of Environmental Management 186.SI(2017):233-239.
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