Which chromatography column should be chosen?
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I need to analyze some benzene samples whose main impurities are thiophene and cyclohexane. I plan to use a SP3400 gas chromatograph with a FID detector; what kind of chromatography column should I choose? Does the manufacturer sell it? This post was last edited by Canghai Yili Sha on 2009-3-11 10:30.]
It is recommended that you purchase the 30-meter, 0.25-coating version of HP-5 or DB-1; make sure to adjust the temperature of the column chamber, and that will suffice
Benzene and cyclohexane can be analyzed using a FID detector, but the sensitivity for analyzing thiophene is low; it is not as effective as using an FPD detector； In this way, if thiophene is analyzed using a FPD detector alone, it can be analyzed with a polyethylene glycol column; whereas when benzene and cyclohexane are analyzed using a FID detector, they can be analyzed with an SE-30 column.
Is the level of thiophene in the benzene you’re analyzing high? If the thiophene level isn’t high, using a FID detector won’t work; and even when the thiophene level is high, it’s not easy to use a FID detector either.