Détermination de la bio-origine des sulfures de fer présents dans les systèmes de corrosion anoxiques par analyse de la composition isotopique du soufre en nanoSIMS

Abstract : Characterisation and determination of the bio-origin of iron sulphides in anoxic corrosion systems thanks to isotopic analyses by nanoSIMS. This study is devoted to the determination of the bacterial or inorganic origin of iron sulphides formed during anoxic corrosion processes by sulfur isotopic composition analyses. Broadly, these analyses are realized by IRMS on dissolved sulphides and sulphates. Yet in this study, surface local isotopic analyses are realized by nanoSIMS in order to preserve the information about the corrosion products’ localization. Two kinds of samples are studied: a sample (CBCC) corroded during 13 months in controlled laboratory conditions; and one archeological sample corroded during about 2000 years in not very well known conditions. When the corrosion system is perfectly well known, as for the CBCC sample, the local isotopic analyses by nanoSIMS actually enable to conclude on the (bio-)origin of the iron sulphides observed. However, when the isotopic composition of the sulphate’s source is unknown, as for the archeological sample, the origin of iron sulphides cannot always be determined.
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Sophie Grousset, Smaïl Mostefaoui, Camille Chautard, Alexandre Dauzères, Didier Crusset, et al.. Détermination de la bio-origine des sulfures de fer présents dans les systèmes de corrosion anoxiques par analyse de la composition isotopique du soufre en nanoSIMS. Matériaux & Techniques, EDP Sciences, 2017, 104, pp.509. ⟨10.1051/mattech/2016039⟩. ⟨cea-01634492⟩

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