Journal
ENVIRONMENTAL POLLUTION
Volume 159, Issue 5, Pages 1123-1128Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2011.02.015
Keywords
In situ; Porewater; DGT (diffusive gradients in thin films); Sediment; Chelex resin
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Funding
- National Key Basic Research and Development Plan of China (973 Program) [2004CB418502]
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Vertical profiles of metals were measured by the in situ application of DGT (diffusive gradients in thin films). Well-defined laboratory systems ensured the good reproducibility and precision DGT accumulated metals on a chelex resin after diffusional transport through a layer of hydrogel. Three kinds of DGT probes (with three thicknesses of diffusive gel: 0.40 mm, 0.80 mm and 1.92 mm) measured interfacial concentration and induced flux from solid to solution phase which had intricate variations with depth. The DGT induced flux and interfacial concentration of four metals belonged to partially sustained state, indicating a labile equilibrium of metals between solid phase and porewater. The concentration profiles showed the good correlation between Mn and Co and peak concentrations of Mn and Fe between -2.00 cm and -5.25 cm with depth. (C) 2011 Elsevier Ltd. All rights reserved.
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