Isogeochemers, We are developing an automatic sample carousel to replace the manual carbonate prep system sold by UIC for their coulometer (to do % carbonate determination). So far we have obtained numbers like 99.6 +/- 0.11% for reagent grade CaCO3, running a sample every 5 minutes. Is there anybody out there who might be interested in such a system? Neil S. Summer Stable Isotope Laboratory Department of Geology 1112 Turlington Hall, University of Florida, PO Box 117340 Gainesville, FL 32611-7340 email: [log in to unmask] Phone: (352) 392-2296 FAX: (352) 392-9294