Dear Dr. Roland,
I have a Finnigan Delta plus IRMS coupled to the Flash elemental analyser
for the combution and stable isotope ratio analysis on a continuous flow
basis. I have been measuring the delta 13C and 15N in the same sample
fairly easily with this set up. The manual of the finnigan systems should
provide you the requisite information on the methodology. Briefly, there is
a method for sample acquisition called JumpNC method. Typically, this
methods swtiches between the two isotopes. First it meaures the N2 signal
and rapidly changes over to the carbon measurement mode. Depending on the
elution of the two gas peaks, we can fix the appropriate time for the swtich
over. I have seen that at a flow rate of helium carrier flow of 85 ml per
min and the GC temperature at 80 oC, the two peaks seperate at 210 sec from
the start of the run.
I am not sure if this method of sample acquisiton would be available with
the other IRMS syetmes.
Hope this helps.
Regards and best wishes
Dr. M.S. Sheshshayee
National Facility for Stable Isotopes in Biological Sciences
Department of Crop Physiology
University of Agricultural Sciences
GKVK Campus, Bangalore 560 065
Ph(W): +91-80-363 6713
Ph(H): +91-80-363 6414
>From: "Roland A. Werner" <[log in to unmask]>
>Reply-To: Stable Isotope Geochemistry <[log in to unmask]>
>To: [log in to unmask]
>Subject: [ISOGEOCHEM] d13C and d15N from the same sample
>Date: Fri, 22 Nov 2002 12:19:54 +0100
>Dear Isotope community,
>I am interested in measuring d13C and d15N values from the same sample
>(or d18O and d2H from the same sample). Can anyone provide me with
>literature citations concerning methodological papers or applications of
>this in any field.
>Thanks a lot + Best regards
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