Investigation of DGT as a metal speciation technique for municipal wastes and aqueous mine effluents

Tahir Yapici, Ismail I. Fasfous, John Murimboh, Chuni L. Chakrabarti*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

This paper reports the results of an investigation on the performance of the Diffusive Gradient in Thin Films (DGT) Technique in speciation of metals in aqueous samples of municipal wastes and mine effluents. The DGT was assessed regarding its suitability for in situ determination of metal speciation in municipal wastes and aqueous mine effluents. As the thickness of the diffusive gel layer of the DGT was increased to 0.40, 0.80, and 1.60 mm, a decrease in the amount of accumulated metal mass was observed for most of the metals studied in all the effluent samples. However, the results were different from one field-study site to another. Effect of kinetics also was observed in the amount of accumulated metal mass by the DGT. The computer speciation code, Windermere Humic Aqueous Model (WHAM VI), was used to predict the metal speciation of Cd, Cu, Ni, Pb, Co, and Zn, and WHAM predictions were compared with those of the experimentally determined metal speciation by the DGT technique (free and labile metal ions). This comparison showed good similarities between the theoretically predicted WHAM VI values and the experimentally measured values by DGT. The DGT technique was found to be simple and useful for investigating chemical speciation of trace metals in aqueous samples of municipal wastes and aqueous mine effluents.

Original languageEnglish (US)
Pages (from-to)70-76
Number of pages7
JournalAnalytica Chimica Acta
Volume622
Issue number1-2
DOIs
StatePublished - Aug 1 2008
Externally publishedYes

Keywords

  • Aqueous mine effluents
  • Diffusive gel layer thicknesses
  • Diffusive Gradient in Thin Film Technique
  • Municipal wastes
  • Trace metals

ASJC Scopus subject areas

  • Analytical Chemistry
  • Environmental Chemistry
  • Biochemistry
  • Spectroscopy

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