Hello listmembers, Has anyone calibrated these soils as a standard for %C,N and C,N isotopes. Any numbers available will be gratefully appreciated. NIST 2711 Montana Soil (moderately elevated trace element conc) NIST 2709 San Joaquin Soil NIST 8704 Buffalo River Sediment Thank you, Valerie ******************* Valerie Claymore Lab Manager Rafter Stable Isotope Lab GNS Science 30 Gracefield Road Lower Hutt New Zealand phone +64-4-570-4645 fax +64-4-570-4657 ***********************