259 

 The tertiary amines running from N,N-dimethyl-l-dodecanamine to N,N- 

 dimethyl-l-octadecanaminewere not identified until relatively late in the work of this 

 dissertation. Some of these amines elute at almost identical retention times as the 

 carboxylic acids, and their peaks are sometimes hidden under more abundant sample 

 components. When EI mass spectra were examined, there are only two significant 

 ions present, that of the base beak at m/z 58 (due to ^-cleavage of the chain) and 

 that of the corresponding odd-mass molecular ion. Library identification typically 

 fails to identify these compounds correctly. Upon manual inspection of library mass 

 spectra for suspected amines, it was determined that in addition to the 12 carbon or 

 greater chain, substitutions of anything larger than but methyl groups would result 

 in additional characteristic ions in the spectra. Once the proper restrictions were 

 imposed upon the library search, the identification of these amines were achieved 

 readily provided they were contained within the library. 



The final component of interest to be discussed in the text is one which was 

 introduced unintentionally into the system but later used to aid in comparisons. The 

 compound 1,1-difluoroethene is found in Dust-Off. Dust-Off was employed to cool 

 down the glass injection port liner between runs prior to introducing a sample. 

 When the glass injection port liner was reinserted and the analysis conducted, latent 

 difluoroethene was cryo-focused with the sample. Normally, this was the first peak 

 which eluted off of the column. This retention time of this component was later 

 used in correlating analyses acquired with the same GC and MS parameters. 



