Fourier transform infrared spectroscopy for the determination of CO and CH4, compared with chromatography
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MN MF ME DMC DMO CO2 N2O N2 NO CH4 CO % % % % % % % % % % % 9.39 3.25 0.19 0.18 - 5.01 0.56 47.79 11.77 4.66 17.19 Dear teachers, the data in the table above are the results obtained from chromatographic analysis; the value of CO is lower than that obtained using online (Fourier-transform infrared) analysis； Chromatography employs the external standard method, with a configuration of four valves and six columns, as well as dual TCD+FID detectors. Some people say that methane in the infrared spectrum can cause interference with CO; I’m not sure if this is true or not. I hope the experts here can help me out. Thank you!
If it is indeed a Fourier-transform infrared spectroscopy for the analysis of carbon monoxide and methane, interference can be avoided when establishing the analysis model. Has the original poster mixed things up? This should be non-spectral infrared gas analysis. For multi-component analysis, gas chromatography is a reliable analytical method, as the separation process minimizes interference between the components. Using Fourier infrared spectroscopy to analyze gases requires certain knowledge of stoichiometry as well as some knowledge of mathematical statistics for model development.
Teacher, I have no experience with infrared technology. The online instrument mentioned to me refers to Fourier infrared technology, and it is said to be from ABB company. There has always been a discrepancy in the data from the instruments and analytical tests. They measured MN, NO, and CO online, claiming that the three measurement chambers operated separately without any interference. If it is Fourier infrared, compared to chromatographic analysis, which one is more accurate?
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