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Biocorrosion detection by sulphur isotopic fractionation measurements

Résumé : 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.
Domaine de référence : Biocorrosion
Auteur Grousset S., Urios L., Mostefaoui S., Dauzeres A., Crusset D., Deydier V., Linard Y., Dillmann P., Mercier-Bion F., Neff D.
Année de parution : 2019.
Mots-clés : iron sulphide, microbiological corrosion, NanoSIMS, sulphur isotopic fractionation.
Type de document : Article de revue.
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Ce projet est financé par le Fonds Européen de Développement Régional, la Région Normandie et le Conseil Départemental de la Manche.