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Microcolumn-based speciation analysis of thallium in soil and green cabbage
Yanlong Jia;  Tangfu Xiao;  Jialong Sun;  Fei Yang;  Philippe C. Baveye
2018
发表期刊Science of The Total Environment
卷号630页码:146-153
摘要

Thallium (Tl) is a toxic trace metal, whose geochemical behavior and biological effects are closely controlled by its chemical speciation in the environment. However, little tends to be known about this speciation of Tl in soil and plant systems that directly affect the safety of food supplies. In this context, the objective of the present study was to elaborate an efficient method to separate and detect Tl (I) and Tl(III) species for soil and plant samples. This method involves the selective adsorption of Tl(I) on microcolumns filled with immobilized oxine, in the presence of DTPA (cliethyleneffiaminepentaacetic acid), followed by DTPA-enhanced ultrasonic and hearing-induced extraction, coupled with ICP-MS detection. The method was characterized by a LOD of 0.037 mu g/L for Tl(I) and 0.18 mu g/L for Tl(III) in 10 mL samples. With this method, a second objective of the research was to assess the speciation of Tl in pot and field soils and in green cabbage crops. Experimental results suggest that DTPA exit-acted Tl was mainly present as Tl(I) in soils (>95%). Tl in hyperaccumulalor plant green cabbage was also mainly present as Tl(I) (>90%). With respect to Tl uptake in plants, this study provides direct evidence that green cabbage mainly takes up Tl(I) from soil, and transports it into the aboveground organs. In soils, Tl(III) is reduced to Tl(I) even at the surface where the chemical environment promotes oxidation. This observation is conducive to understanding the mechanisms of Tl isotope fractionation in the soil-plant system. Based on geochemical fraction studies, the reducible fraction was the main source of Tl getting accumulated by plants. These results indicate that the improved analytical method presented in this study offers an economical, simple, fast, and sensitive approach for the separation of Tl species present in soils at trace levels. 

关键词Tl Speciation extraction soil green Cabbage geochemical fractionTl Bioavailability
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/42920512-1/8774
专题环境地球化学国家重点实验室
作者单位1.School of Resources and Environmental Engineering, Guizhou Institute of Technology, Guiyang 550003, China
2.Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
4.UMR Ecosys, AgroParisTech, Université Paris-Saclay, Avenue Lucien Brétignières, 78850 Thiverval-Grignon, France
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Yanlong Jia;Tangfu Xiao;Jialong Sun;Fei Yang;Philippe C. Baveye. Microcolumn-based speciation analysis of thallium in soil and green cabbage[J]. Science of The Total Environment,2018,630:146-153.
APA Yanlong Jia;Tangfu Xiao;Jialong Sun;Fei Yang;Philippe C. Baveye.(2018).Microcolumn-based speciation analysis of thallium in soil and green cabbage.Science of The Total Environment,630,146-153.
MLA Yanlong Jia;Tangfu Xiao;Jialong Sun;Fei Yang;Philippe C. Baveye."Microcolumn-based speciation analysis of thallium in soil and green cabbage".Science of The Total Environment 630(2018):146-153.
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