Dear all I have a batch preparation line of S02 from sulphates and sulphides for MS determination of the 34S/32S ratio. Our lab is now engaged with the measurement of isotope ratio of sulphur in oil, and all the references I have found are related to GC-IRMS. I like to know if somebody can provide me any reference (or better a paper) where it is described how to separate the total suphur from an oil matrix in form of an inorganic salt or compound. Thank you in advance. Héctor O. Panarello Director INSTITUTO DE GEOCRONOLOGÍA Y GEOLOGÍA ISOTÓPICA (INGEIS) Pabellón INGEIS - Ciudad Universitaria 1428 Ciudad de Buenos Aires Tel: +54-11-4784 7798 Fax +54-11-47833024