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|Title:||Diffusive gradients in thin films measurement of sulfur stable isotope variations in labile soil sulfate|
|Citation:||Analytical and Bioanalytical Chemistry, 2016; 408(29):8333-8341|
|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 Springerlink.com|
|Appears in Collections:||Agriculture, Food and Wine publications|
Aurora harvest 8
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