PDF hadddad.pdf | Request a copy Full text restricted Available under University of Tasmania Standard License.

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.

Item Type:	Article
Authors/Creators:	Yokoyama, T and Macka, M and Haddad, PR
Journal or Publication Title:	Fresenius' Journal of Analytical Chemistry
ISSN:	0937-0633
DOI / ID Number:	10.1007/s002160101030
Additional Information:	The original publication is available at www.springerlink.com
Item Statistics:	View statistics for this item

Actions (login required)

Item Control Page