I have a tank of H2 at +63permil, from electrolysis.

It's from a lab H2 generator so only has 60psi, but we've filled a large cylinder so we get a reasonable life out of it. It's true that there is an extreme fractionation with the process, but near the bottom of the reservoir the remaining water is so heavy that the H2 generated is also very heavy. It's also simple to spike the reservoir with deuterated water to tailor the output.

Paul Eby
University of Victoria

At 12:04 AM 17/05/2006, you wrote:
Hi, since my name popped up...

The gas for the H2 ring test was indeed supplied by Messer. However, these were small lecture bottles with no more than 10 Bar pressure.
For a ConFlo reference gas one should avoid H2 that was manufactured by electrolysis. The lattter results in H2 which is about -700 per mill vs VSMOW (well suited as a working reference gas for the equilibration technique, though).
If the H2 is generated using the Steel Reforming process, it maintains its original isotopic signature (water and natural gas) to a large extent. The resulting delta value is often between -100 and -300 per mill, which is not too bad as a working reference for carrier gas analysis systems.
So, just ask for the manufacturing process when you buy the gas.

Cheers   Willi


Clemente Recio wrote:
A few years ago, the test on mass spec performance for D/H measurement used three low-pressure H2-gas bottles supplied by MESSER GRIESHEIM GmbH; Postfach 10 09 62; 47009 Duisburg; Germany (Willi Brand organized it).

One of the gases was rated at O permil delta D.

Other than that, the ref gas we are currently using was supplied by a local gas manufacturer, and its dD value is -163 permil, that is not bad for both natural waters and common minerals (our supplier is "Carburos Metálicos", but I'm sure they are part of a larger international group; it should not be difficult to find out its Australian equivalent).

Cheers,

Clemente




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
 



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Laboratorio de Isótopos Estables
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Univ. de Salamanca
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Willi A. Brand, Stable Isotope Laboratory     
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