SEDISOR is a very small company specialising in the analysis of concentrations (major, trace and ultra-trace) and isotopic compositions (Sr, Nd, Hf, Pb, Li, O, C, N... and dating). We work on all types of inorganic, organic, fluid and solid matrices. We operate as a service provider or as part of a research collaboration in the geosciences as well as the environment, pollution, quality or fraud control. We carry out our measurements using IRMS, ICP-OES, ICP-MS-HR, MC-ICP-MS and TIMS in association with the Pôle de Spectrométrie Océan (PSO).