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Thu, 25 Feb 1999 07:24:16 -0800 |
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Andrew:
You may want to get in touch with Bruno at Costech Analytical in
Valencia, California, 1-800-524-7219. They supply tin cups
especially for liquid samples, part numbers 041062, 041063 and
041064. Part number 041064 looks to be quite small with dimensions
of 1 x 5.5 mm. This may help you in terms of keeping the amount if
tin to a minimum.
Regards,
Bill Griffis
*******************************************************
William L. Griffis
Chemist
Integrated Stable Isotope Research Facility (ISIRF)
Terrestrial Plant Ecology Branch
Western Ecology Division
National Health and Environmental Effects
Research Laboratory
US Environmental Protection Agency
200 SW 35th Street
Corvallis, Oregon 97333
Telephone: 541-754-4761 FAX: 541-754-4799
E-mail: [log in to unmask]
*******************************************************
>>> Andrew Johnston <[log in to unmask]> - 2/25/99 6:17 AM >>>
Hi
I am using some solvents to transfer an azo dye into tin cups for
elemental combustion and then ms analysis. This has proved to be
tricky as the solvent, acetone, has the effect of creeping up the
sides and over the top of the cup resulting in loss of sample.
To reduce this I have been using Chromosorb and it works to some
extent but nothing is ever perfect....
so I thought I would use the smooth wall tin cups with a flat base.
They work great and dont need any chromosorb!!
Now this is a whole bunch more tin being combusted
Does anyone have any advice or tips to improve the combustion of the
sample. I remember someone telling me that it is best to increase the
O2 time.
We are using an ANCA SL sampler converter attached to a 20-20 IRMS
Europa Scientific.
Any advice or tips are most welcome.
Andrew Johnston
Dr A.M.Johnston
CEP
SCRI
Dundee
DD2 5DA
Scotland
Tel No: 44 1382 562731
Fax No: 44 1382 562426
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