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Adduct in GC-MS?

Posted: Sun Dec 12, 2004 11:37 am
by Fabiano
have anyone ever heard that GC-MS with electron impact could generate adducts? more exacly proton adducts.

I´m performing a TMS derivative analysis and some of my peaks are giving 1 mass unit higher than literature, even standards.

other people insist that the equipment is calibrated.

thank you

Posted: Sun Dec 12, 2004 10:40 pm
by wra
You need to tune your GC-MS.

Posted: Mon Dec 13, 2004 12:41 pm
by Fabiano
but if peaks of other give me right spectra and only mine is 1 unit higher, is there some explanation?