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Hi all, We have been asked to run some soil samples taken from a salt marsh in Australia, the majority of which are from the surface, but there are also some from a core. The samples have been dried and ground and analysed for TOC. Based on a requirement of 400 ug carbon per sample for our system (Sercon 20-22), some of the samples will require between 5 and 15 mg of soil per capsule. I spend the majority of my time working with collagen in the 1 mg range, so this venturing into the unknown. For those of you working with soils, is there anything I need to be aware of when running this type of material for delta 13C, and how much material per capsule is too much? Many thanks for any assistance. Matt -- Please note that I check emails only twice a day, so urgent or quick queries may be resolved more efficiently by telephone or face-to-face. *Mr Matthew von Tersch* *BioArCh Laboratory Manager* *Department of Archaeology - University of York* *Room 229, Environment Building* *Wentworth Way* *York YO10 5DD* *Tel: 01904 328282* *E-mail: [log in to unmask] <[log in to unmask]>*