I have a request to set up for carbonate stable isotope analysis. We
have a Gas Bench II, without trapping and concentration loops, and a
Delta Plus XL available with the possibility of using a Delta V if
necessary. I have not analyzed carbonates before. Samples will
probably be in the 1mg size range. It seems that a good starting place
would be to use manually added phosphoric acid to the carbonate sample
in flushed Exetainers. However, this would appear to generate about 2%
v/v CO2 in the Exetainer head space, when out Delta Plus XL saturates at
about 0.3% v/v. Can we dilute with the Gas Bench?
I am also curious if the residual acidified sample can be used for
ICP-OES analysis of Mg, Ca, Mn, Fe and Sr. Since this is not typically
done I assume there is a problem with analyzing samples in a phosphoric
acid matrix. Any information anyone has would be helpful. This later
question on ICP is also being sent to the Plasmachem list, apologies for
Does anyone have recommendations on procedures for this analysis? Any
advice and/or literature on the subject would be useful.
Thanks in advance, Paul Brooks.
Mr. Paul D. Brooks, Spectroscopist,
Dept. Integrative Biology MC3140
1005 Valley Live Sceince Building,
UC Berkeley, CA 94720-3140.
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