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|Title:||Novel diffusive gradients in thin films technique to assess labile sulfate in soil|
|Citation:||Analytical and Bioanalytical Chemistry, 2016; 408(24):6759-6767|
|Ondrej Hanousek, Sean Mason, Jakob Santner, Md Mobaroqul Ahsan Chowdhury, Torsten W. Berger, Thomas Prohaska|
|Abstract:||A novel diffusive gradients in thin films (DGT) technique for sampling labile soil sulfate was developed, based on a strong basic anion exchange resin (Amberlite IRA-400) for sulfate immobilization on the binding gel. For reducing the sulfate background on the resin gels, photopolymerization was applied instead of ammonium persulfate-induced polymerization. Agarose cross-linked polyacrylamide (APA) hydrogels were used as diffusive layer. The sulfate diffusion coefficient in APA gel was determined as 9.83 × 10⁻⁶ ± 0.35 × 10⁻⁶ cm² s⁻¹ at 25 °C. The accumulated sulfate was eluted in 1 mol L⁻¹ HNO₃ with a recovery of 90.9 ± 1.6 %. The developed method was tested against two standard extraction methods for soil sulfate measurement. The obtained low correlation coefficients indicate that DGT and conventional soil test methods assess differential soil sulfate pools, rendering DGT a potentially important tool for measuring labile soil sulfate.|
|Keywords:||Diffusive gradients in thin films (DGT); ICP-MS; sulphur; sulfate; soil|
|Rights:||© The Author(s) 2016. This article is published with open access at Springerlink.com|
|Appears in Collections:||Agriculture, Food and Wine publications|
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