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- Posts: 22
- Joined: Tue Sep 29, 2009 5:15 am
Hello,
Not sure if I post this to the right section of the forum.
I posted something about dimethylamine analysis before in the GC forum and that method should work ok for me. That was for analysis of other amines in DMA but direct column injection from a non-aqueous matrix so I can do it by GC direct injection.
This time, however, I need to analyse DMA itself in a very heavy aqueous matrix which contains apart from high contents of DMA (20 % or more), surfactants, etc. I would like to analyse DMA by derivitisation (possibly with 9-fluorenyl-methylchloroformate) but I have my concerns as the method I found in the literature uses this technique for analysis of DMA in groundwater where (i) the levels of DMA are supposed to be relatively low; (ii) the matrix is fairly clean. None of these is the case with my matrix.
Therefore I am now inclined to think that may be the best approach is to ditch the HPLC idea and analyse DMA underivatised by head space GC considering the heavy matrix of the system and the fact that DMA is the only volatile present in this system.
Any thoughts would be highly appreciated.
Regards,
B
Not sure if I post this to the right section of the forum.
I posted something about dimethylamine analysis before in the GC forum and that method should work ok for me. That was for analysis of other amines in DMA but direct column injection from a non-aqueous matrix so I can do it by GC direct injection.
This time, however, I need to analyse DMA itself in a very heavy aqueous matrix which contains apart from high contents of DMA (20 % or more), surfactants, etc. I would like to analyse DMA by derivitisation (possibly with 9-fluorenyl-methylchloroformate) but I have my concerns as the method I found in the literature uses this technique for analysis of DMA in groundwater where (i) the levels of DMA are supposed to be relatively low; (ii) the matrix is fairly clean. None of these is the case with my matrix.
Therefore I am now inclined to think that may be the best approach is to ditch the HPLC idea and analyse DMA underivatised by head space GC considering the heavy matrix of the system and the fact that DMA is the only volatile present in this system.
Any thoughts would be highly appreciated.
Regards,
B
