Biocorrosion detection by sulphur isotopic fractionation measurements

Abstract : This innovative study presents a local diagnosis approach based on nanoSIMS technique to determine the biotic/abiotic origin of iron sulphides of (sub)micron size heterogeneously located in the corrosion product layers of iron. For iron coupons corroded in controlled conditions, negative δ34Ssulphides-sulphates were obtained in biotic conditions contrary to δ34Ssulphides-sulphates obtained in abiotic ones. These results underline that nanoSIMS is a reliable local technique to detect the formation origin of (sub)micron iron sulphides. This successful methodology was then applied to a complex system representative of an iron corroded in the conditions similar to those of radioactive wastes storage in geological medium.
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S. Grousset, L. Urios, S. Mostefaoui, A. Dauzères, D. Crusset, et al.. Biocorrosion detection by sulphur isotopic fractionation measurements. Corrosion Science, Elsevier, 2019, pp.108386. ⟨10.1016/j.corsci.2019.108386⟩. ⟨cea-02412940⟩

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