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In situ measurements of concentrations of Cd, Co, Fe and Mn in estuarine porewater using DGT.

Authors
  • Wu, Zhihao1
  • He, Mengchang
  • Lin, Chunye
  • 1 State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, No. 19, Xinjiekouwai Street, Beijing 100875, China. [email protected] , (China)
Type
Published Article
Journal
Environmental pollution (Barking, Essex : 1987)
Publication Date
May 01, 2011
Volume
159
Issue
5
Pages
1123–1128
Identifiers
DOI: 10.1016/j.envpol.2011.02.015
PMID: 21397371
Source
Medline
License
Unknown

Abstract

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.

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