Dear Isogeochem-ers, First of all, my thanks to the response on hydrogen isotope equilibration kinetics. The GCA paper was the ticket for me. Would anyone know where I can purchase 34S enriched sulfate or sulfide? Thanks, T.C. Onstott --------------------------------------------------------------------- T.C. Onstott, Dept. of Geosciences Guyot Hall, Princeton, NJ 08544 USA ph: (609) 258-6898 fax: (609) 258-1274 [log in to unmask]