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Stable Isotope Geochemistry

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Subject:
From:
Howie Spero <[log in to unmask]>
Date:
Tue, 10 Dec 1996 07:41:17 -0700
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Dear Juske:

	We have found that sample size should not affect either C or O
value in a common acid bath system. We run samples in the size range 10-100
ug without problems. However, if your water trap is inefficient, you will
see an oxygen drift as the run goes on. The other possibility is the
architecture of your system. The potential for fractionation does exist if
you have a lot of surface area before the water trap. Look at the following
reference for specifics.

 Wachter, E.A. & Hayes, J.M. (1985) Exchange of oxygen isotopes in carbon
dioxide-phosphoric acid systems. Chemical Geology, 52, 365-374.

	Good luck.


Howie Spero

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