Two-dimensional images of dissolved sulfide and metals in anoxic sediments by a novel diffusive gradients in thin film probe and optical scanning techniques

Yue Gao*, Sebastiaan van de Velde, Paul N. Williams, Willy Baeyens, Hao Zhang

*Corresponding author for this work

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

A novel diffusive gradients in thin film probe developed comprises diffusive gel layer of silver iodide (AgI) and a back-up Microchelex resin gel layer. 2D high-resolution images of sulfide and trace metals were determined respectively on the AgI gel by densitometric analysis and on the Microchelex resin layer with laser-ablation-inductively-coupled plasma mass spectrometry (LA-ICP-MS).We investigated the validity of the analytical procedures used for the determination of sulfide and trace metals. We found low relative standard deviations on replicate measurements, linear trace-metal calibration curves between the LA-ICP-MS signal and the true trace-metal concentration in the resin gel, and a good agreement of the sulfide results obtained with the AgI resin gel and with other analytical methods. The method was applied on anoxic sediment pore waters in an estuarine and marine system. Simultaneous remobilization of sulfide and trace metals was observed in the marine sediment.

Original languageEnglish
Pages (from-to)63-71
Number of pages9
JournalTRAC-TRENDS IN ANALYTICAL CHEMISTRY
Volume66
Early online date14 Jan 2015
DOIs
Publication statusPublished - Mar 2015

Keywords

  • 2D image
  • DGT
  • Diffusive gradients in thin film
  • Dissolved sulfide
  • Inductively-coupled plasma
  • LA-ICP-MS
  • Laser ablation
  • Mass spectrometry
  • Remobilization
  • Trace metal

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Environmental Chemistry

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