Abstract
Gas chromatographic-mass spectrometric identification of urea derivatives formed by the reaction of amines with isocyanates N,N′-Di- and N,N′,N′-trisubstituted ureas constitute suitable derivatives for the gas chromatographic (GC) determination of primary and secondary amines. The GC identification of N- tert.-butyl-,N′,N′-alkyl urea derivatives presented in the first communication has been succesfully confirmed by mass spectrometry (MS) and mass fragmentometry. The reproduced mass spectra of six N- tert.-butyl-,N′,N′-alkyl ureas were interpreted according to the decomposition mechanisms of less complicated alkyl ureas known from the literature. Using combined GC-MS the detection limit was 10 ng; for a mass fragmentometric determination 500 pg were necessary. GC retention data of N- tert.-butyl-,N′,N′-alkyl ureas and N-3-trifluoromethylphenyl ureas on SE-30, OV-17, SE-30-QF-1 and OV-101 liquid phases are presented in standardized form as Kováts' retention indices.
Published Version
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