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The problem with the standard gas mix

http://www.chromforum.org/viewtopic.php?t=81884

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The problem with the standard gas mix

Posted: Mon Feb 05, 2018 11:29 am
by sana70
Hi
I have a standard mix gas contain: CO2 10.2 ppm CO 2.3ppm in nitrogen
I injected this STD two month ago and it's peak size was normal, today I inject this STD again but the peak sizes was abnormal, peak size of CO2 was so decrease, this problem is about the mix gas, but i dont know why this happened?
i analysis bay gas chromatography with FID detector and methanaizer

Re: The problem with the standard gas mix

Posted: Mon Feb 05, 2018 2:31 pm
by GasMan
Did the CO peak also drop off in sensitivity? If the answer is 'Yes', then I would suspect the nickel catalyst.

Gasman

Re: The problem with the standard gas mix

Posted: Wed Feb 07, 2018 5:01 am
by sana70
The answer is NO, CO peak size was the same, just CO2 changed

Re: The problem with the standard gas mix

Posted: Tue Feb 27, 2018 2:16 pm
by AICMM
How are you injecting? Like Gasman, I would suspect methanizer before standard.

Best regards,

AICMM
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