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Microcolumn-based speciation analysis of thallium in soil and green cabbage.
Sci Total Environ. 2018 Jul 15; 630:146-153.ST

Abstract

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 (diethylenetriaminepentaacetic acid), followed by DTPA-enhanced ultrasonic and heating-induced extraction, coupled with ICP-MS detection. The method was characterized by a LOD of 0.037 μg/L for Tl(I) and 0.18 μg/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 extracted Tl was mainly present as Tl(I) in soils (>95%). Tl in hyperaccumulator 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.

Authors+Show Affiliations

School of Resources and Environmental Engineering, Guizhou Institute of Technology, Guiyang 550003, China.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; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China. Electronic address: tfxiao@gzhu.edu.cn.School of Resources and Environmental Engineering, Guizhou Institute of Technology, Guiyang 550003, China.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.UMR Ecosys, AgroParisTech, Université Paris-Saclay, Avenue Lucien Brétignières, 78850 Thiverval-Grignon, France.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29477112

Citation

Jia, Yanlong, et al. "Microcolumn-based Speciation Analysis of Thallium in Soil and Green Cabbage." The Science of the Total Environment, vol. 630, 2018, pp. 146-153.
Jia Y, Xiao T, Sun J, et al. Microcolumn-based speciation analysis of thallium in soil and green cabbage. Sci Total Environ. 2018;630:146-153.
Jia, Y., Xiao, T., Sun, J., Yang, F., & Baveye, P. C. (2018). Microcolumn-based speciation analysis of thallium in soil and green cabbage. The Science of the Total Environment, 630, 146-153. https://doi.org/10.1016/j.scitotenv.2018.02.147
Jia Y, et al. Microcolumn-based Speciation Analysis of Thallium in Soil and Green Cabbage. Sci Total Environ. 2018 Jul 15;630:146-153. PubMed PMID: 29477112.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Microcolumn-based speciation analysis of thallium in soil and green cabbage. AU - Jia,Yanlong, AU - Xiao,Tangfu, AU - Sun,Jialong, AU - Yang,Fei, AU - Baveye,Philippe C, Y1 - 2018/02/21/ PY - 2017/10/09/received PY - 2018/02/04/revised PY - 2018/02/12/accepted PY - 2018/2/25/pubmed PY - 2018/6/23/medline PY - 2018/2/25/entrez KW - Extraction KW - Geochemical fraction KW - Green cabbage KW - Soil KW - Tl bioavailability KW - Tl speciation SP - 146 EP - 153 JF - The Science of the total environment JO - Sci Total Environ VL - 630 N2 - 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 (diethylenetriaminepentaacetic acid), followed by DTPA-enhanced ultrasonic and heating-induced extraction, coupled with ICP-MS detection. The method was characterized by a LOD of 0.037 μg/L for Tl(I) and 0.18 μg/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 extracted Tl was mainly present as Tl(I) in soils (>95%). Tl in hyperaccumulator 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. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/29477112/Microcolumn_based_speciation_analysis_of_thallium_in_soil_and_green_cabbage_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(18)30538-2 DB - PRIME DP - Unbound Medicine ER -