Fellow CF-IRMS users, I'm just curious what others are getting for %C and/or %N values of the following NIST standards... 1. NIST 1515 (apple leaves) 2. NIST 1547 (peach leaves) 3. NIST 1566b (oyster tissue) 4. NIST 1570a (spinach leaves) 5. NIST 1573a (tomato leaves) 6. NIST 1575 (pine needles) 7. NIST 1577b (bovine liver) 8. NIST 2976 (mussel tissue) I'll show you mine, if you show me yours. Also, if you have results for any other plant/animal/soil NIST standards not listed above, I'd love to see those too. If enough people respond, I can post an (anonymous) summary of results to the list. Cheers! Rick Rick Doucett, Ph.D. Colorado Plateau Stable Isotope Laboratory Department of Biological Sciences Northern Arizona University Building 21, South Beaver St. Flagstaff, AZ, 86011-5640 Tel: 928-523-0967 Fax: 928-523-7500 Email: [log in to unmask] NEW WEBSITE: http://www4.nau.edu/cpsil/