文摘
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. Electronic supplementary materialThe online version of this article (doi:10.1007/s00244-015-0184-1) contains supplementary material, which is available to authorized users.