The assessment of localized remobilization and geochemical process of 14 metals at sediment/water interface (SWI) of Yingkou coast (China) by diffusive gradients in thin films (DGT)

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• 作者：Zhihao Wu ; Mengchang He ; Shengrui Wang ; Zhaokui Ni
• 关键词：Remobilization ; Geochemical process ; Sediment/water interface (SWI) ; Diffusive gradients in thin films (DGT)
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：73
• 期：10
• 页码：6081-6090
• 全文大小：876 KB
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• 作者单位：Zhihao Wu (1) (2) (3) (4)
  Mengchang He (4)
  Shengrui Wang (1) (2) (3)
  Zhaokui Ni (1) (2) (3)
  
  1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, 100012, Beijing, People’s Republic of China
  2. State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-environment, Chinese Research Academy of Environmental Sciences, 100012, Beijing, People’s Republic of China
  3. Dongtinghu Lake Ecological Observation and Research Station (DEORS), 41400, Yueyang, Hunan Province, People’s Republic of China
  4. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, 100875, Beijing, People’s Republic of China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

A passive sampling technique—diffusive gradients in thin films (DGT) was used to determine profiles of 14 metals on fine scale at SWI of two sites in Yingkou coast and to investigate biogeochemical process of Mn/Fe and other metals. Based on DGT concentration/flux and biogeochemical mechanism, remobilization character of metals in sediment profile was studied. Both profiles of two sites indicated sharp peaks of Fe and Mn at anoxic sediment, which verified redox process of Fe/Mn with large fluxes. Especially, very large peaks of Mn at ?.75?cm (7.239?×?10??μg?cm? s?) and Fe at ?.25?cm (1.420?×?10??μg?cm??s?) at site 2 corresponding with sulfide concentrations at same depths in profile were used for the calculation of saturation index to assess the solubility of metal sulfide. Other metals in certain segments of profiles at two sites indicated coupled geochemical process between them and Fe/Mn. DGT probe should be a reliable tool to measure multi-metals in sediment porewater and to assess geochemical process in coastal area.