Isogeochemists:

I was having problems last night with Isogeochem recognizing my e-mail
address, which I hope are fixed now, so let me send the message about the
helium we use at the University at Albany that I wanted to send last night,
for Bill and others interested:

We use Air Products "Ultra-Pure Carrier Grade" He, which is supposed to be
99.9995% He (excluding Ne), with our Carlo Erba NA 1500 NC Series II EA and
Micromass Optima.  This grade is between UHP at 99.999% and Research or
Chromatographic Grade which are both 99.9999%.  Our price (through the
University's ChemStores, is about $72 for a 291 cf tank, about $20 more
than HP He (99.997%).  The N2 and O2 appear to be quite low in comparison
with levels in UHP He.  We have never felt the need to employ traps or
scrubbers.  Maybe a good and cost-effective solution.

Steve

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Stephen S. Howe                         Office:  (518) 442-5053
Dept. of Earth & Atmos. Sciences        Stable Isotope Lab:  (518) 442-4471
Earth Science 352B                      FAX:  (518) 442-5825
University at Albany                    E-mail:  [log in to unmask]
1400 Washington Avenue        http://www.albany.edu/geosciences/sshowe.html
Albany, NY  12222-0001      http://www.albany.edu/geosciences/sirmslab.html
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