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Modification of the electroosmotic flow and separation selectivity of anions in electrochromatography with pseudo-stationary phases of C-14-alkyldimethylammoniopropane sulfonate zwitterionic surfactants by addition of salts to the background electrolyte

Citation

Yokoyama, T and Macka, M and Haddad, PR, Modification of the electroosmotic flow and separation selectivity of anions in electrochromatography with pseudo-stationary phases of C-14-alkyldimethylammoniopropane sulfonate zwitterionic surfactants by addition of salts to the background electrolyte, Fresenius Journal of Analytical Chemistry, 371, (4) pp. 502-506. ISSN 0937-0633 (2001) [Refereed Article]

DOI: doi:10.1007/s002160101030

Abstract

The effects of salts (NaCl, NaClO4, MgCl2, CeCl3) added to background electrolyte (BGE) solutions (10 mmol L-1 sodium phosphate, pH 7.2) on electroosmotic flow (EOF) and the separation selectivity of anions (chloride, bromide, iodide, nitrite, nitrate, chlorate, thiocyanate, iodate, chromate, and molybdate ion) by capillary electrochromatography using the zwitterionic surfactant 3-(N-N-dimethylmyristylammonio)propane sulfonate (C14N3S) as a pseudo-stationary phase were investigated. There are two mechanisms affecting the separations: 1. the cations and anions of the added salts interact with the zwitterionic surfactant to varying degrees, thus changing the overall retention of the analytes; and 2. they change the EOF and the resulting apparent mobilities. It was shown that a BGE containing perchlorate and a low concentration of zwitterionic surfactant (2 mmol L-1) gave a stable and reproducible EOF and the concentration of perchlorate could be used to manipulate the separation selectivity for polarizable anions, such as iodide and thiocyanate. These effects are discussed in terms of measured association constants describing the interaction of anions and cations with the zwitterion. © Springer-Verlag 2001.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Separation Science
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Yokoyama, T (Dr Takashi Yokoyama)
Author:Macka, M (Professor Mirek Macka)
Author:Haddad, PR (Professor Paul Haddad)
ID Code:22183
Year Published:2001
Web of Science® Times Cited:15
Deposited By:Chemistry
Deposited On:2001-08-01
Last Modified:2011-08-03
Downloads:0

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