薄膜扩散梯度（DGT）技术在沉积物-水界面（SWI）测量多种金属用于地球化学研究
Multi-metals Measured at Sediment-Water Interface (SWI) by Diffusive Gradients in Thin Films (DGT) Technique for Geochemical Research.
作者信息
Wu Zhihao, Jiao Lixin, Wang Shengrui, Xu Yuanzhi
机构信息
State 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.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, People's Republic of China.
出版信息
Arch Environ Contam Toxicol. 2016 Feb;70(2):429-37. doi: 10.1007/s00244-015-0184-1. Epub 2015 Jun 23.
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.
薄膜扩散梯度（DGT）技术用于测定孔隙水剖面，并评估沉积物/水界面处金属的再迁移特性。锰的再迁移是由于剖面中的氧化还原反应，产生了两个大峰值：一个在沉积物深度-4.75 cm处，DGT浓度为1355 μg L(-1)；另一个在沉积物孔隙水深度-3.25 cm处，DGT浓度为1040 μg L(-1)。铁还原区在沉积物深度-4.75 cm处有一个大的铁峰值（3209 μg L(-1)）。铁的DGT剖面还表明，沉积物中铁还原/硫还原边界区溶解铁浓度有小峰值和低值。DGT剖面中痕量金属与铁或锰特征的详细对应关系表明，它们的释放与铁或锰氧化物的还原溶解有关。
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