文献类型：期刊文献

英文题名：Microcolumn-based speciation analysis of thallium in soil and green cabbage

作者：Jia, Yanlong Xiao, Tangfu Sun, Jialong Yang, Fei Baveye, Philippe C.

第一作者：Jia, Yanlong

通信作者：Xiao, TF[1]

机构：[1]Guizhou Inst Technol, Sch Resources & Environm Engn, Guiyang 550003, Guizhou, Peoples R China;[2]Guangzhou Univ, Sch Environm Sci & Engn, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Guangzhou 510006, Guangdong, Peoples R China;[3]Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Guizhou, Peoples R China;[4]Univ Paris Saclay, AgroParisTech, UMR Ecosys, Ave Lucien Bretignieres, F-78850 Thiverval Grignon, France

第一机构：贵州理工学院资源与环境工程学院

通信机构：corresponding author), Guangzhou Univ, Sch Environm Sci & Engn, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Guangzhou 510006, Guangdong, Peoples R China.

年份：2018

卷号：630

起止页码：146-153

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20180904831621);Scopus(收录号：2-s2.0-85042256913);WOS:【SCI-EXPANDED(收录号:WOS:000432467700016)】；

基金：This research was supported by the National Natural Science Foundation of China (U1612442, 41563015, 41473124, 41673138, 41563010), Guizhou Provincial Science and Technology Foundation (2014J2079), Innovation Group project for the Education Department of Guizhou Province (2016045) and the Guizhou Institute of Technology Foundation (XJGC20140606, 20140605). Dr. Simon Foster from University of Canberra was appreciated for his good suggestions.

语种：英文

外文关键词：Tl speciation; Extraction; Soil; Green cabbage; Geochemical fraction; Tl bioavailability

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. (C) 2018 Elsevier B.V. All rights reserved.