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Modification of the electroosmotic flow and separation selectivity of anions in electrochromatography with pseudo-stationary phases of C14-alkyldimethylammoniopropane sulfonate zwitterionic surfactants by addition of salts to the background electrolyte
Yokoyama, T and Macka, M and Haddad, PR (2001) Modification of the electroosmotic flow and separation selectivity of anions in electrochromatography with pseudo-stationary phases of C14-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
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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
(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.
|Journal or Publication Title:||Fresenius' Journal of Analytical Chemistry|
|Page Range:||pp. 502-506|
|Identification Number - DOI:||10.1007/s002160101030|
The original publication is available at www.springerlink.com
|Date Deposited:||29 Oct 2008 01:10|
|Last Modified:||18 Nov 2014 03:52|
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