Journal
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
Volume 66, Issue -, Pages 63-71Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.trac.2014.11.012
Keywords
DGT; Diffusive gradients in thin film; Dissolved sulfide; Inductively-coupled plasma; Laser ablation; LA-ICP-MS; Mass spectrometry; Remobilization; Trace metal; 2D image
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Funding
- FWO [FWO 1249013N]
- Natural Environment Research Council [ceh010010] Funding Source: researchfish
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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. (C) 2014 Elsevier B.V. All rights reserved.
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