Dear isogeochems,


I work on a GC-C-IRMS delta + (MAT 252). For one 2 weeks, I have had a
problem. The amplitude of the CO2 reference peaks decreased during the week
(from 2.5V to 1V in mass 45). So I should adjust the potentials many times
in the week. Now it happens 3 times in the day.

The CO2 bottle and the pression are OK. Does any one know the reason of this
kind of probleme. Should I only wash the ion source ?


Many Thanks



Laure-Amélie Gonthier

Eurofins Scientific