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Published on: September 1, 2020
Multi-metals Measured at Sediment-Water Interface (SWI) by Diffusive Gradients in Thin Films (DGT) Technique for
Zhihao Wu1,2, Lixin Jiao3, Shengrui Wang4
1State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-environment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, People's Republic of China. wzh7185@mail.bnu.edu.cn.
Abstract:
Diffusive gradients in thin films (DGT) technique was used to determine pore water profile and to assess remobilization character of metals at sediment/water interface. The remobilization of Mn was due to redox reaction in profile, which engendered two large peaks: one with DGT concentration of 1355 µg L(-1) at depth of -4.75 cm in sediment and the other with DGT concentration of 1040 µg L(-1) at depth of -3.25 cm in sediment pore water. Fe reduction zone had a large peak of Fe (3209 µg L(-1)) at depth of -4.75 cm in sediment. Fe DGT-profile also indicated the little peaks and low values of dissolved Fe concentration in Fe-reduction/S-reduction boundary zone in sediment. Detailed correspondence of trace metals with Fe or Mn features in DGT-profiles suggested that their release is related to the reductive dissolution of Fe- or Mn-oxide.
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