STUDIES ON THE DETERMINATION OF INORGANIC ANIONS BY CAPILLARY ELECTROPHORESIS

被引:54
作者
BENZ, NJ
FRITZ, JS
机构
[1] IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011
[2] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011
关键词
D O I
10.1016/0021-9673(94)80271-8
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
In order to separate anions effectively it is usually necessary to eliminate or reverse the direction of electroosmotic flow (EOF) resulting from attraction of cations to the negatively charged surface of a silica capillary. Previous workers have accomplished this by adding a quaternary ammonium salt (Q(+)) as an EOF ''modifier''. Under typical experimental conditions, a concentration of Q(+) > 0.25 mM is required to reverse the EOF direction. Addition of a low percentage of 1-butanol to the aqueous electrolyte was found to reduce the EOF. A combination of butanol and a very low concentration of Q(+) (typically 0.03 mM) was found to be particularly effective in controlling EOF and in giving effective separations of complex mixtures of anions. The probable mechanism of the butanol-Q(+) effect is discussed.
引用
收藏
页码:437 / 443
页数:7
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