Wolfram and Isogeochemists:

In our lab, we use a refrigerated immersion probe to cool
acetone in small dewars from room temperature down to less
than -90 C in a few minutes, avoiding the hazards associated
with exotic solvent mixtures.  The refrigeration unit, an
RP-100-CD from Lab Plant, is portable and has proved very
reliable over several years.


Michael Isaacs, Isotope Unit,
Postgraduate Research Institute for Sedimentology,
University of Reading,
Whiteknights, Reading RG6 6AB, UK.

Phone: +44 (0) 118 9875123 ext 7972
Fax:   +44 (0) 118 9310279
Email: [log in to unmask]