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In-situ characterization and assessment of arsenic mobility in lake sediments.
Environ Pollut. 2016 Jul; 214:314-323.EP

Abstract

In-situ characterization and assessment of arsenic (As) mobility in sediments was scarce. In this study, the distributions of labile As at a vertical resolution of 2 mm were obtained in the sediments of a large Lake Taihu through in-situ measurements using a Zr-oxide diffusive gradients in thin films (Zr-oxide DGT) technique. The DGT-labile As, interpreted as DGT flux (FDGT), exhibited three different patterns in the lake, with all the patterns generally showing an increasing mobility followed by a decreasing mobility with sediment depth. The mobility of As could be characterized by the average FDGT (0.06-1.27 pg cm(-2) s(-1)) in the top 10 mm surface sediments, the maximal FDGT (FDGT-M, 0.14-2.44 pg cm(-2) s(-1)) in the end of the initial increasing phase of FDGT, and the diffusion length (ΔL, 28-66 mm) from the depth showing the FDGT-M to the sediment-water interface. The upward mobilization of labile As from the deep sediments to the surface sediments and overlying water became evident when FDGT-M > 1.7 pg cm(-2) s(-1) or ΔL < 41 mm. The results, for the first time, showed a prospect in in-situ risk assessment of the pollution of sediment As. It was suggested that the increasing mobility of As in the upper sediments was controlled by the reduction of As(V) and the reductive dissolution of Fe(III) (hydr)oxides, while the decreasing mobility in the deep sediments was attributed to immobilization of As(III) by secondary Fe(II)-bearing minerals.

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.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China. Electronic address: 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.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.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.GIS Centre, Ryan Institute and School of Geography and Archaeology, National University of Ireland, Galway, Ireland.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27107255

Citation

Sun, Qin, et al. "In-situ Characterization and Assessment of Arsenic Mobility in Lake Sediments." Environmental Pollution (Barking, Essex : 1987), vol. 214, 2016, pp. 314-323.
Sun Q, Ding S, Wang Y, et al. In-situ characterization and assessment of arsenic mobility in lake sediments. Environ Pollut. 2016;214:314-323.
Sun, Q., Ding, S., Wang, Y., Xu, L., Wang, D., Chen, J., & Zhang, C. (2016). In-situ characterization and assessment of arsenic mobility in lake sediments. Environmental Pollution (Barking, Essex : 1987), 214, 314-323. https://doi.org/10.1016/j.envpol.2016.04.039
Sun Q, et al. In-situ Characterization and Assessment of Arsenic Mobility in Lake Sediments. Environ Pollut. 2016;214:314-323. PubMed PMID: 27107255.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - In-situ characterization and assessment of arsenic mobility in lake sediments. AU - Sun,Qin, AU - Ding,Shiming, AU - Wang,Yan, AU - Xu,Lv, AU - Wang,Dan, AU - Chen,Jing, AU - Zhang,Chaosheng, Y1 - 2016/04/20/ PY - 2016/01/10/received PY - 2016/04/10/revised PY - 2016/04/11/accepted PY - 2016/4/24/entrez PY - 2016/4/24/pubmed PY - 2017/1/4/medline KW - Arsenic KW - Eutrophication KW - High resolution KW - Mobility KW - Sediment KW - Zr-oxide DGT SP - 314 EP - 323 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ Pollut VL - 214 N2 - In-situ characterization and assessment of arsenic (As) mobility in sediments was scarce. In this study, the distributions of labile As at a vertical resolution of 2 mm were obtained in the sediments of a large Lake Taihu through in-situ measurements using a Zr-oxide diffusive gradients in thin films (Zr-oxide DGT) technique. The DGT-labile As, interpreted as DGT flux (FDGT), exhibited three different patterns in the lake, with all the patterns generally showing an increasing mobility followed by a decreasing mobility with sediment depth. The mobility of As could be characterized by the average FDGT (0.06-1.27 pg cm(-2) s(-1)) in the top 10 mm surface sediments, the maximal FDGT (FDGT-M, 0.14-2.44 pg cm(-2) s(-1)) in the end of the initial increasing phase of FDGT, and the diffusion length (ΔL, 28-66 mm) from the depth showing the FDGT-M to the sediment-water interface. The upward mobilization of labile As from the deep sediments to the surface sediments and overlying water became evident when FDGT-M > 1.7 pg cm(-2) s(-1) or ΔL < 41 mm. The results, for the first time, showed a prospect in in-situ risk assessment of the pollution of sediment As. It was suggested that the increasing mobility of As in the upper sediments was controlled by the reduction of As(V) and the reductive dissolution of Fe(III) (hydr)oxides, while the decreasing mobility in the deep sediments was attributed to immobilization of As(III) by secondary Fe(II)-bearing minerals. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/27107255/In_situ_characterization_and_assessment_of_arsenic_mobility_in_lake_sediments_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0269-7491(16)30306-2 DB - PRIME DP - Unbound Medicine ER -