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Stable Isotope Geochemistry

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Stable Isotope Geochemistry <[log in to unmask]>
Subject:
memory affects
From:
David Denhaan <[log in to unmask]>
Date:
Wed, 17 Nov 1999 15:28:51 -0600
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Stable Isotope Geochemistry <[log in to unmask]>
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I am analyzing leachate samples from a soil column to which enriched N has been added.  The leachate has been evaporated and the salt that remains is analyzed on a Finnigan Delta S for N15.  The samples are highly enriched and I have been having problems with memory affects and a background build up that I think is due to halides.  What can I do to minimize these problems?  Is there an enrichment affect when the leachate is evaporated?  If anybody has experience with a similar experimental design or running enriched samples please drop me a line.

David DenHaan
National Soil Tilth Lab
Ames, IA

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