TY - JOUR

T1 - Diffusive gradients in thin films measurement of sulfur stable isotope variations in labile soil sulfate

AU - Hanousek, Ondrej

AU - Santner, Jakob

AU - Mason, Sean

AU - Berger, Torsten W.

AU - Wenzel, Walter W.

AU - Prohaska, Thomas

N1 - Publisher Copyright: © 2016, The Author(s).

PY - 2016/9/29

Y1 - 2016/9/29

N2 - 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.

AB - 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.

KW - Diffusive gradients in thin films

KW - Isotope ratio

KW - MC ICP-MS

KW - Sulfate

KW - Sulfur

UR - http://www.scopus.com/inward/record.url?scp=84989159117&partnerID=8YFLogxK

U2 - 10.1007/s00216-016-9949-2

DO - 10.1007/s00216-016-9949-2

M3 - Article

AN - SCOPUS:84989159117

VL - 408.2016

SP - 8333

EP - 8341

JO - Analytical and bioanalytical chemistry

JF - Analytical and bioanalytical chemistry

SN - 1618-2642

IS - 29

ER -