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How is it that carbon tetrachloride shows up on FID?

Posted: Mon Dec 16, 2019 7:33 pm
by osp001
It's a weak signal, admittedly, but how does it show up at all? CCl4 is not combustible under atmospheric conditions; are the FID conditions (gas mixture + higher temperature) responsible for allowing carbon tet to form ions that the detector reflects the detection of an analyte?

Re: How is it that carbon tetrachloride shows up on FID?

Posted: Fri Feb 07, 2020 4:28 pm
by James_Ball
I would think that is correct. The FID looks for ionization not simply combustion, if the temperature can knock off even an electron should give a signal. Dichloromethane and Chloroform are also not considered combustible but they give signals, increasing sensitivity with decreasing number of halogens.