I get Mol sieve 5A 80/100 from Grace, catalog # 5605, and it was about $50 for 50g. With 50g, you could repack the column yourself 100's of times.
My "kit" is a large syringe without the plunger to use as a funnel, small hoses to connect the funnel to column and opposite end of the column to light vacuum, and a big wooden dowel to tap the column as I'm filling it. Quartz wool at the ends.
I do like to weigh all the old sieve that came out so that I put a similar amount back in. It is possible to create a pretty restrictive column if you use very fine wool or really cram the filling in there. Since the column is only 0.6 m it is pretty easy to refill. Longer columns are somtimes easier to start with a straight piece of tubing. But there you go, a $400 part that is probably $15 in materials.
Manager, Stable Isotope Core Laboratory
Washington State University
School of Biological Sciences
Pullman, WA 99164-4236
Laboratory for Biotechnology and Bioanalysis (LBB2) Stable Isotope Core
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Georges Paradis
Sent: Tuesday, January 08, 2013 4:16 PM
To: [log in to unmask]
Subject: [ISOGEOCHEM] TC/EA GC column molecular sieve
Does anyone know a good source for replacment molecular sieve 5a for the GC column in the Finnigan TC/EA? Marilyn mentioned a while back that there was a Supelco kit for repacking the column, but I'm having a hard time finding it. The Sigma Aldrich website has molesieve 5a packing in
60/80 mesh, but not 80/100 mesh.
The exact replacement column from Agilent (0.6 meter, 1/4" od, 4mm id,
80/100 mesh) is $402. Restek sells a molesieve 5a 3 foot, 1/8" od, 2.1mm id, 80/100 mesh for only $110. Has anyone had any success with a different column?
Georges L. Paradis
Analytical Lab Manager
Marine Science Institute
Bldg 520, Room 4002
University of California Santa Barbara
Santa Barbara, CA 93106
805-893-3802 (MSI lab)
805-893-3041 (ICPMS lab)
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