We get tanks from Air Liquide that are routinely near -200 per mil.  We
have also started making our own tailored cylinders by purchasing a cheap
tank of D-poor hydrogen and then spiking it with a small amount of pure HD
to bring it to a composition more similar to our unknowns (this is
particularly helpful for studies of exotic materials, like H2 in air, that
are very D-rich).

John

>I know this question has been discussed before but I cannot find answers
>anywhere in the archives.
>
>Has anyone found a North American supplier of research grade H2 gas
>cylinders in the "normal" working range (0 to -428). I am not talking about
>those costly low pressure 1 L "certified" ref gas cylinders from Messer or
>Oztech suitable for dual inlet ref gas.
>
>We have recently tested a Peak Scientifc Hydrogen HG200 gas generator and it
>produced 100 PSI 99.999 H2 isotopically close (+/- 30 permil)to the water
>put in the device, but its quite costly (~5500 USD) to justify for the
>occasional use.
>
>Am just wondering if anyone has found a supplier in US or Canada yet.
>(Address and cost would be nice).  I imagine these days it would be pretty
>hard to ship a cylinder of H2 from Europe.
>
>Len Wassenaar