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Title: An integrated method for surfactant analysis
Author: Suwanprasert, Thongjuta.
ISNI:       0000 0001 3492 5659
Awarding Body: University of Northumbria at Newcastle
Current Institution: Northumbria University
Date of Award: 2005
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The integration of analytical surfactant methods with HPLC is the purpose of this study. A single separation with a similar stationary phase, mobile phase and detection was developed for faster and more convenient separation. Three different solubilising functionality surfactants (anionic, cationic and non-ionic) were evaluated in a single separation. Three surfactant standards, alcohol ethoxylate (AE), linear alkylbenzene sulphonate (LAS) and benzalkonium chloride (BAK) were investigated in the method development. The different types of reversed phase HPLC stationary phases, Cs (Exsil 80A Cs,150 x 4.6 mm, 3J.lm),endcapped Cg (Symmetry Cg, 150 x 4.6 mm, 3.5 urn), base deactivated Cg (Symmetry Shield RPg, 150 x 4.6 mm, 3.5 urn) and cyanopropyl (Genesis CN, 150 x 4.6 mm, 4J.lm) columns were studied. The following mobile phase modifiers, sodiumĀ· perchlorate, tetramethylammonium bromide (TMA) and ammonium acetate were also investigated. A mixture of two ionic surfactants (BAK and LAS) were separated using the above columns. Isocratic elutions between acetonitrile and either 0.05 M sodium perchlorate or 0.05 M TMA or 0.05 M ammonium acetate were evaluated for separation of the two components. An Exsil 80A Cs, 150 x 4.6 mm, 3 urn, column was chosen for separation of a mixture of the three surfactants. The gradient mobile phase of 0.05 M ammonntium acetate, acetonitrile and methanol was applied at a DV detection of220 nm. All homologues of linear alkylbenzene sulphonate (CIO, Cn. CI2 and Cl3), alcohol ethoxylate (C12, C14,CI6 and CIg) and benzalkonium chloride (C14) appear with k' values from 3.22 (CIO of LAS) - 9.53 (C14ofBAK). An integrated chromatographic system for the separation of these three surfactants was developed in a microbore column. An Exsil 80A Cg, 150 x 2.1 mm, 3 prn column was developed for application in liquid chromatography - mass spectrometry (LC-MS).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available