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Peak Chromium Pollution in Summer and Winter Caused by High Mobility of Chromium in Sediment of a Eutrophic Lake: In Situ Evidence from High Spatiotemporal Sampling

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    Peak Chromium Pollution in Summer and Winter Caused by High Mobility of Chromium in Sediment of a Eutrophic Lake: In Situ Evidence from High Spatiotemporal Sampling
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    • Xianfang Fan
      Xianfang Fan
      State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
      More by Xianfang Fan
    • Shiming Ding*
      Shiming Ding
      State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
      *Phone: +86-25-86882207; fax: +86-25-86882207; e-mail: [email protected]
      More by Shiming Ding
      Orcidhttp://orcid.org/0000-0001-5317-1899
    • Musong Chen
      Musong Chen
      State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
      More by Musong Chen
    • Shuaishuai Gao
      Shuaishuai Gao
      State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
      University of Chinese Academy of Sciences, Beijing 100049, P. R. China
      More by Shuaishuai Gao
    • Zhen Fu
      Zhen Fu
      State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
      University of Chinese Academy of Sciences, Beijing 100049, P. R. China
      More by Zhen Fu
    • Mengdan Gong
      Mengdan Gong
      State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
      More by Mengdan Gong
    • Daniel C. W. Tsang
      Daniel C. W. Tsang
      Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P. R. China
      More by Daniel C. W. Tsang
      Orcidhttp://orcid.org/0000-0002-6850-733X
    • Yan Wang
      Yan Wang
      State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
      Nanjing Easysensor Environmental Technology Company, Limited, Nanjing 210018, P. R. China
      More by Yan Wang
    • Chaosheng Zhang
      Chaosheng Zhang
      International Network for Environment and Health, School of Geography and Archaeology, National University of Ireland, Galway H91 CF50, Ireland
      More by Chaosheng Zhang
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    Environmental Science & Technology

    Cite this: Environ. Sci. Technol. 2019, 53, 9, 4755–4764
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    https://doi.org/10.1021/acs.est.8b07060
    Published March 28, 2019
    Copyright © 2019 American Chemical Society
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    Abstract

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    To study the mechanisms of chromium (Cr) mobilization in sediments of eutrophic lakes, monthly sampling was performed in the Meiliang Bay of Lake Taihu, China, combined with laboratory experiments. High-resolution dialysis and diffusive gradients in thin film (DGT) sampling techniques were used. Results indicated that in July 2016 and January 2017, the concentrations of soluble Cr and DGT-labile Cr(VI) in the overlying water exceeded both drinking and fishery water quality standards, resulting from the high mobility of Cr in sediments. In July (summer), the high concentration of soluble Cr (134.04 ± 7.20 μg/L) detected in the anaerobic sediments was primarily caused by the complexation of Cr(III) with dissolved organic matter (DOM). This mechanism was supported by an observed simultaneous increase of soluble Cr and DOM under simulated anaerobic conditions. In January (winter), the high concentrations of soluble Cr (97.55 ± 9.65 μg/L) and DGT-labile Cr(VI) (25.83 ± 1.25 μg/L) in aerobic sediments were primarily caused by reoxidation of Cr(III) by Mn(III/IV) oxides as evidenced by the lowest concentrations of soluble and DGT-labile Mn(II). This study sheds light on the full-year variation and mechanisms of Cr mobilization in eutrophic lake sediments and suggests the urgent need for remediation of Cr pollution especially for winter.

    Copyright © 2019 American Chemical Society

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.8b07060.

    • Tables showing water and sediment characteristics of the sampling site, input parameters used for Cr speciation calculation, average values of Cr concentrations and correlation analysis under control, aerobic, and anaerobic treatments; Figures showing vertical distributions of soluble Cr and DGT-labile Cr(VI), total Cr concentrations and fraction concentrations in sampling site, variation of water and sediment parameters in aerobic–anaerobic incubation experiment, hourly changes in soluble Cr concentrations in algae addition experiment, and schematic illustration of Cr mobility in a sediment–water system (DOCX)

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    Cite this: Environ. Sci. Technol. 2019, 53, 9, 4755–4764
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.est.8b07060
    Published March 28, 2019
    Copyright © 2019 American Chemical Society
    Request reuse permissions

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