Hello Everyone, I need to measure the d13C and d15N of organic matter in volcanic lake sediments. The problem is that the sulphur in these samples "kills" the combustion column in the EA after only 250 samples. We have resorted to running the samples only when a column nears the end of its life. I was wondering if anyone can suggest a better solution and provide general advice on how to handle S-rich samples. Yours truly, Jennifer ------------------------------------------------------ Jennifer Mckay Agente de Recherche / Research Associate GEOTOP - Universite du Quebec a Montreal C.P. 8888, succursale Centre-Ville Montreal, Quebec, Canada H3C 3P8 Telephone bureau/office: 514-987-3000 (poste/ext 2413) Telephone lab: 514-987-3000 (poste/ext 7028) Telephone GEOTOP: 514-987-4080 Telecopieur/Fax: 514-987-3635 E-mail: [log in to unmask] or if that fails try [log in to unmask] ------------------------------------------------------