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Simultaneous measurements of arsenic and sulfide using diffusive gradients in thin films technique (DGT).
Environ Geochem Health. 2018 Oct; 40(5):1919-1929.EG

Abstract

Diffusive gradients in thin films technique (DGT) is a dynamically passive sampling technique which has been applied increasingly to the environmental monitoring field. In the preliminary period, the DGT with zirconium hydroxide-silver iodide as the binding phase (ZrO-AgI DGT) has been developed for the determination of sulfide (S(II)). On this basis, this paper developed its determination method for inorganic arsenite (As(III)) to further realize the simultaneous and high-resolution measurements of labile inorganic As and S(II) in sediments. ZrO-AgI binding gel had a strong ability in adsorbing and fixing As(III), showing a linear increase in the initial 12.5 min. After saturation of S(II) on ZrO-AgI binding gel, the adsorption rate and adsorption capacity of As(III) reduced by 8 and 14%, respectively. A stable elution rate (89.1 ± 2.2%) was obtained by extraction of As(III) on the binding gel using a mixture solution of 1.0 M NaOH and 1.0 M H2O2 (1:1). The DGT capacity of As(III) determined by the ZrO-AgI DGT was 23.6 μg cm-2. DGT uptakes of As(III) were independent of pH (4.0-9.0) and ionic strength (0.01-100 mM), and they did not interfere with each other during the uptake process. Simultaneous measurements of labile As and S(II) in four sediment cores of Taihu Lake (China) with ZrO-AgI DGT showed that they had similarly vertical distributions in the top 16-mm layer in one core and in the whole profile up to the 35 mm depth in two cores. It likely reflected a simultaneous release of As and S(II) in sediments by synchronous reduction of As-hosted oxidized iron and sulfate, respectively. The simultaneous decreases of labile As and S(II) from their co-precipitation (e.g., As2S3) were not obvious in deeper sediment layer through the measurement with ZrO-AgI DGT.

Authors+Show Affiliations

Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China. smding@niglas.ac.cn.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.International Network for Environment and Health, National University of Ireland, Galway, Ireland.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28477161

Citation

Xu, Lv, et al. "Simultaneous Measurements of Arsenic and Sulfide Using Diffusive Gradients in Thin Films Technique (DGT)." Environmental Geochemistry and Health, vol. 40, no. 5, 2018, pp. 1919-1929.
Xu L, Sun Q, Ding S, et al. Simultaneous measurements of arsenic and sulfide using diffusive gradients in thin films technique (DGT). Environ Geochem Health. 2018;40(5):1919-1929.
Xu, L., Sun, Q., Ding, S., Gong, M., & Zhang, C. (2018). Simultaneous measurements of arsenic and sulfide using diffusive gradients in thin films technique (DGT). Environmental Geochemistry and Health, 40(5), 1919-1929. https://doi.org/10.1007/s10653-017-9968-8
Xu L, et al. Simultaneous Measurements of Arsenic and Sulfide Using Diffusive Gradients in Thin Films Technique (DGT). Environ Geochem Health. 2018;40(5):1919-1929. PubMed PMID: 28477161.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Simultaneous measurements of arsenic and sulfide using diffusive gradients in thin films technique (DGT). AU - Xu,Lv, AU - Sun,Qin, AU - Ding,Shiming, AU - Gong,Mengdan, AU - Zhang,Chaosheng, Y1 - 2017/05/05/ PY - 2017/01/26/received PY - 2017/04/25/accepted PY - 2017/5/10/pubmed PY - 2019/5/29/medline PY - 2017/5/7/entrez KW - Arsenic KW - Diffusive gradients in thin films technique (DGT) KW - Sediment KW - Simultaneous measurement KW - Sulfide SP - 1919 EP - 1929 JF - Environmental geochemistry and health JO - Environ Geochem Health VL - 40 IS - 5 N2 - Diffusive gradients in thin films technique (DGT) is a dynamically passive sampling technique which has been applied increasingly to the environmental monitoring field. In the preliminary period, the DGT with zirconium hydroxide-silver iodide as the binding phase (ZrO-AgI DGT) has been developed for the determination of sulfide (S(II)). On this basis, this paper developed its determination method for inorganic arsenite (As(III)) to further realize the simultaneous and high-resolution measurements of labile inorganic As and S(II) in sediments. ZrO-AgI binding gel had a strong ability in adsorbing and fixing As(III), showing a linear increase in the initial 12.5 min. After saturation of S(II) on ZrO-AgI binding gel, the adsorption rate and adsorption capacity of As(III) reduced by 8 and 14%, respectively. A stable elution rate (89.1 ± 2.2%) was obtained by extraction of As(III) on the binding gel using a mixture solution of 1.0 M NaOH and 1.0 M H2O2 (1:1). The DGT capacity of As(III) determined by the ZrO-AgI DGT was 23.6 μg cm-2. DGT uptakes of As(III) were independent of pH (4.0-9.0) and ionic strength (0.01-100 mM), and they did not interfere with each other during the uptake process. Simultaneous measurements of labile As and S(II) in four sediment cores of Taihu Lake (China) with ZrO-AgI DGT showed that they had similarly vertical distributions in the top 16-mm layer in one core and in the whole profile up to the 35 mm depth in two cores. It likely reflected a simultaneous release of As and S(II) in sediments by synchronous reduction of As-hosted oxidized iron and sulfate, respectively. The simultaneous decreases of labile As and S(II) from their co-precipitation (e.g., As2S3) were not obvious in deeper sediment layer through the measurement with ZrO-AgI DGT. SN - 1573-2983 UR - https://www.unboundmedicine.com/medline/citation/28477161/Simultaneous_measurements_of_arsenic_and_sulfide_using_diffusive_gradients_in_thin_films_technique__DGT__ L2 - https://doi.org/10.1007/s10653-017-9968-8 DB - PRIME DP - Unbound Medicine ER -