Dear IsotopeGeochem,

There appears to be two methods to analyze C-13 and N-15 on combustion
samples with CF-IRMS.  One manufacturer runs the N-15 and then detunes the
source and runs C-13 at reduced sensitivity (VG), while the second has a
diluter that dilutes the C-13 with more carrier gas prior to dynamic
analysis.  Both claim their protocol is superior.  What are the user's
experience with the two systems, pitfalls and positive points?

Thanks is advance and Happy Holidays,

Bill

William J. Showers
Dept of Marine Earth & Atm. Sciences,
North Carolina State Univ.

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