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Stable Isotope Geochemistry <[log in to unmask]>

Subject:

sample size and C13 results

From:

David Denhaan <[log in to unmask]>

Date:

Tue, 1 Feb 2000 10:20:00 -0600

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Stable Isotope Geochemistry <[log in to unmask]>

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Has anyone experienced a problem with introducing too much sample in a continuous flow IRMS application?  I have found if I run more than 1 mg total carbon my delta values become more negative and I develop a sharp fore peak on my ion 44 peak.  From the amplitude of my ion peaks, 2 to 3 volts, I am not overwhelming my collectors.  Any advice would be appreciated.

Thanks,

David DenHaan

National Soil Tilth Laboratory
Ames, Iowa

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