Hi Ian:

My first H2 tank from Air Liquide had a d2H about -300 permil. I asked a
local Air Liquide to supply two tanks filled separately. Presumably H2
tanks are filled from a large container that may have light d2H on the
top and heavy on the bottom?? Anyway, after one or two, I got a
tank with a d2H value close to -100 permil.

Feng

---------------------------------------
Feng H. Lu, Ph.D.
Shaw Environmental
Ground Water and Ecosystems Restoration
US EPA NRMRL
P.O. Box 1198
Ada, OK 74821-1198
USA
(580)436-8676




                                                                        
             ian cartwright                                             
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Dear All

I am looking for a source of H2 reference gas (preferably with a d2H in
the -100 to 0 per mil range). Any suggestions of suppliers.

Cheers

Ian


______________________________________________


Dr Ian Cartwright
Head - School of Geosciences
Hydrogeology and Stable Isotopes
Monash University
Clayton Vic. 3800, Australia
t: 03 9905-4887 / 4879, f: 03 9905-4903

...water, our greatest resource