We were quite happy with our SPEX CertiPrep 6850 freezer mill (Glen Creston Ltd.) using stainless steel sample tubes and impactors.
We have used this mill for organic samples (wood, finger nails, ecstasy tablets ...) and on occasion soil samples and were happy with the performance though hair for example is hard to get out of the vials once finely milled (electrostatic like heck) even with the sample removal tool (basically a Teflon rod or plunger) available from Spex.
"Facts do not cease to exist because they are ignored."
Aldous Huxley, "Proper Studies", 1927
Dr W Meier-Augenstein, CChem, FRSC
Senior Lecturer - Stable Isotope Forensics
Centre for Anatomy & Human Identification
University of Dundee
Associate Professor (Adjunct)
Dept of Anthropology
Southern Illinois University
Principal Scientist - Stable Isotopes
Stable Isotope Laboratory
Dundee, DD2 5DA
Tel.: +44 (0)1382 560025
Fax: +44 (0)1382 568544
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From: PLASMACHEM-L: Analytical Chem.(ICP's, DCP's, MIP's). on behalf of Pappas, Richard Steve (CDC/CCEHIP/NCEH)
Sent: Fri 22/01/2010 13:19
To: [log in to unmask]
Subject: Ball Mills for sample prep
Does anyone have experience with Spex 5100 or 8000M Mixer Mills, or
similar competitors' products?
The Spex equipment is certainly more affordable than others I have seen,
but that worries me.
The Spex mill seems to have sample vials and grinding balls made from a
wide variety of materials:
Agate, polystyrene, polycarbonate, polyethylene, stainless steel,
"hardened steel," tungsten carbide, zirconia, alumina ceramic vials
Methacrylate, zirconia, tungsten carbide, stainless steel grinding
Some seem attractive from a metals contamination standpoint, but I
wonder about effectiveness, as well as if the machine does a good job
without falling apart in two months or contaminating samples like crazy.
R. Steven Pappas, Ph.D.
Emergency Response & Air Toxicants Branch
Centers for Disease Control & Prevention
4770 Buford Hwy. NE, M.S. F-44
Atlanta, GA 30341-3717
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