I would appreciate if somebody could point to me to the solution of
the following problem: I am running a EA-MS (Carlo Erba
CHN 1110 + Delta C) for analysis of 13 C and 15 N in a variety of
After switching the instrumen off and back on about two weeks ago,
the CO2 showed a broad tailing, resulting in wrong results
for 13C/12 C in standards and also too low measured C -
concentrations. The N2 peak seems perfectly o.k., concentrations and
isotope ratios. I have changed the O2 and carrier flow rates in all
directions, put on new oxidation and reduction columns, renewed the
Anhydron water trap - but, alas, to no avail...
Is it possible the chromatographic column needs to be changed (the
instrument has done about 10000 measurements).
Any help VERY welcome !
Institut fuer Geologie
Lehrstuhl fuer Sediment- und Isotopengeologie