Dear All, Quite some time ago, there were reports that isotope ratio measurement via IR absorption was being developed. Does anyone know what the state of the art is, or can you tell me who to contact to find out? -Tom Johnson *********************** Thomas M. Johnson Assistant Professor Dept. of Geology University of Illinois at Urban-Champaign 245 Natural History Bldg. MC-102 1301 W. Green St. Urbana, IL 61801 (217) 244-2002 FAX (217) 244-4996 [log in to unmask] Visit the Hydrogeology Program's web site: www.geology.uiuc.edu/Hydrogeology ************************