We are seeing our QC check standard for nitrogen decreasing significantly after batches of 20 runs. The first check is 98 ppm, the next 82 ppm, the next is 70 ppm, the next is 51 ppm and the last one was 34 ppm.
Wondering why the check is slowly being decreased. Is there a way to adjust something in the instrument? thanks.
Paul Milham
I don't know, but you may have the answer in what it is you do between runs that restores performance.
What happens with C?
Have you systematically investigated? A temperature drop could cause that type of problem since the normal operating temp may be marginal. Otherwise, it's in a later step.
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