Can anyone recommend a source of hydrogen reference gas
with a del D SMOW reasonably close to 0? At the moment I'm
using a reference gas with del D < -400.

Thanks very much for your help.

Jane

*********************************************
Dr. Jane L Alexander
Department of Earth and Planetary Sciences
Harvard University
20 Oxford Street                   phone:   (617) 496 5894
Cambridge                             fax:       (617) 496 4387
MA 02138                             e-mail: [log in to unmask]