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Type: Journal article
Title: Diffusive gradients in thin films measurement of sulfur stable isotope variations in labile soil sulfate
Author: Hanousek, O.
Santner, J.
Mason, S.
Berger, T.W.
Wenzel, W.W.
Prohaska, T.
Citation: Analytical and Bioanalytical Chemistry, 2016; 408(29):8333-8341
Publisher: Springer
Issue Date: 2016
ISSN: 1618-2642
Statement of
Ondrej Hanousek, Jakob Santner, Sean Mason, Torsten W. Berger, Walter W. Wenzel, Thomas Prohaska
Abstract: A diffusive gradient in thin films (DGT) technique, based on a strongly basic anion exchange resin (Amberlite IRA-400), was successfully tested for ³⁴S/³²S analysis in labile soil sulfate. Separation of matrix elements (Na, K, and Ca) that potentially cause non-spectral interferences in ³⁴S/³²S analysis by MC ICP-MS (multi-collector inductively coupled plasma-mass spectrometry) during sampling of sulfate was demonstrated. No isotopic fractionation caused by diffusion or elution of sulfate was observed below a resin gel disc loading of ≤79 μg S. Above this threshold, fractionation towards ³⁴S was observed. The method was applied to 11 different topsoils and one mineral soil profile (0-100 cm depth) and compared with soil sulfate extraction by water. The S amount and isotopic ratio in DGT-S and water-extractable sulfate correlated significantly (r² = 0.89 and r² = 0.74 for the 11 topsoils, respectively). The systematically lower ³⁴S/³²S isotope ratios of the DGT-S were ascribed to mineralization of organic S.
Keywords: Diffusive gradients in thin films; MCICP-MS; sulfur; sulfate; isotope ratio
Rights: © The Author(s) 2016. This article is published with open access at
DOI: 10.1007/s00216-016-9949-2
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