Nicholas Landau wrote:
>> Dear friends:
>> HELP! I am a grad student at Rutgers University, New Brunswick NJ. I am
> searching for an instrument with which to measure millimolar (or better
> yet, micromolar) concentrations of H2 in the headspace of culture vessels.
>> From what I understand, there are two instruments which fit the bill.
>> One is a GC equipped with a molecular sieve column, an oven which can be
> programmed to run a temperature gradients (or a dual detector,) and a
> TCD. One would use Ar or N2 as the carrier gas.
>> Even more sensitive is a trace gas analyzer, equipped with a reducing
> mercury hydrogen probe.
>> If anybody knows of such an instrument in the NYC - Philadelphia area
> which could be used periodically, I would be very grateful of any
> news. So far, I have not been able to locate one at RU, at least one
> which is currently operational. I would value any leads whatsoever.
If ALL you want to see is hydrogen... all you need is a helium leak detector
retuned for mass 2 instead of mass 4. Nanomolar should be a snap, with
infinitesimal sample size. Calibrate with a permeation tube.
--
Alan "Uncle Al" Schwartz
UncleAl0 at ix.netcom.com ("zero" before @)
uncleal at uvic.ca (to 30 July, cAsE-sensitive!)
http://www.ultra.net.au/~wisby/uncleal.htm
(Toxic URL! Unsafe for children, Democrats, and most mammals)
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