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Application of mass spectrometry to the analysis of mixtures

By David Mitchell


The work presented in this thesis involves the\ud application of mass spectrometry to the analysis of a\ud number of both commercial products and model organic\ud compounds. Use of soft ionisation techniques for\ud thermally labile and ionic compounds (mainly fast atom\ud bombardment, field desorption and thermospray) has been\ud extensively explored for the provision of both\ud qualitative and quantitative information. More\ud established ionisation techniques (electron impact and\ud chemical ionisation) have also been utilized in order to\ud obtain qualitative data. In many cases comparisons have\ud been made between different ionisation modes, and some\ud discussion of the processes occuring is given. Ion\ud structures and decomposition pathways have been\ud elucidated by both tandem mass spectrometry and high mass\ud resolution measurements.\ud Analysis of both complex mixtures and pure\ud compounds has been performed. The systems studied were:\ud surfactants (anionic - sodium alcohol ether sulphates,\ud nonionic - alcohol ethoxylates, cationics - mainly\ud quaternary ammonium salts), organotin PVC heat\ud stabilisers and organic heterocyclic compounds (some\ud chromans, chromenes and corresponding oximes)

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