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Neff, Delphine D.
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document
Bio-corrosion detection by sulphur isotopic fractionation measurements using nanoSIMS
Abstract
ThepresenceofSulphate-ReducingBacteria(SRB)may influencethecorrosionrateofferrousobjectsbyinducing ironsulphidesprecipitation.Thesamephasesareformedby biotic or abiotic ways. Yet, biotic iron sulphides are supposed tobedepletedinheavyisotopesofsulphurrelativetothe startingsulphates[1]. So,sulphurisotopiccomposition analysesenabletodeterminethe(a-)biotic originoftheiron sulfides. Previously, asinglestudy [2] devotedtocorrosion issues had used the sulphur isotopic composition to determine the originofsulphidescompoundsformedonCu/Nisteel. However,thesulphurisotopicfractionationwasobtainedby globalmassspectrometryfromtheprecipitationintoBaSO4 oftheremainingsulphatesofthecorrosionexperiment.This methodisnotadaptedtotheironsulphidesformedinfield samples, presents as strips of some micrometers size [3]. Tofillthisanalyticalgap,inthestudypresentedhere, nanoSIMS(nanoscaleSecondaryIonMassSpectrometry)is usedtodeterminethelocalsulphurisotopiccompositionof theironsulphides within the corrosion product layers oftwo kindsoffieldsamples: ashorttermsystemconsistingofa steelcouponburiedfor24monthsintheAndra (French National Radioactive Waste Management Agency) Underground Research Laboratory devoted to research onthe geologicaldisposalofradioactivewasteatBure(GrandEst, France); and long term systems composed of iron nails buried inthewater-saturatedsoilofthearcheologicalsiteofGlinet (Normandie,France) during around500 years. Thus, thanks to the methodology developed the iron sulphide bio-origin is proved in both corroded samples.