Dear list members,

Does anyone know of a method for measuring 15N at natural abundacne
precision using a continuous flow  C/N analyzer connected to a isotope ratio
mass spectrometer (ANCA system)?  There are severasl published methods
(including our own) for converting enriched NO3 to NH3 with Devarda's alloy,
diffusing it onto acidified paper, putting the paper in tin capsule and
burning it in the C/N analyzer.  However, I do not know if this or a similar
procedure has ever been thouroughly evaluated for natural abundance 15N
measurements.

I would appreciate any information on any experiences anyone has had trying
to use this method, or any method to analyze naural abundace 15N nitrate
using an ANCA system.

Thanks,

Paul D. Brooks.


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Paul D. Brooks, Spectroscopist,
Dept. ESPM,
151 Hilgard Hall,
UC Berkeley, Ca. 94720-3110
USA.

email [log in to unmask]

phone: (510)642-3155
FAX:   (510)643-5098
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