Regarding peak issues in gas chromatography
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This post was last edited by zbx on 2009-12-30 17:00. Gas chromatography was used to measure the mixture of methanol and dimethyl carbonate. Three peaks appeared on the chromatogram. One was more than 0.5, one was more than 0.6, and one was more than 0.7. We determined that 0.6 and 0.7 were the peaks of methanol and dimethyl carbonate, while 0.5 did not know what the peak was. Is it possible that the peak is the azeotrope of methanol and dimethyl carbonate? I would like to ask an expert, thank you.
First of all, what kind of detector are you using? If it is TCD, it may be an air peak. You'd better send a picture so that others can better reference it for you.
I feel like what the person above said is good. You should do some qualitative testing. At least you need to know what other substances may be present in your sample besides these two substances. This will make it easier to characterize. I have never tested this mixture.
You have to tell me what detector you are using, otherwise it won’t be analyzed.
I am using a TCD detector, and apart from these two substances, there should be nothing else. Qualitative methanol is 0.6 and DMC is 0.7. I just felt that there was nothing else, so I guessed that 0.5 was an azeotrope of the two substances.
Post the test instrument configuration and test results pictures so that everyone can analyze them for you.
I have clarified this issue. The other peak is an impurity peak, which means there are three substances in the sample. Thank you for your opinions.