Siberian Federal University

The interfering influence of the anions of typical low-molecular organic acids (citric, formic, maleic, fumaric, tartaric, succinic, and malic) on the determination of fluoride ions by capillary electrophoresis with using chromate background electrolyte was studied. For low concentration of fluoride ions, it was found that the peaks of anions of citric, maleic, and fumaric acids were well separated from the peak of fluoride ions. The peak of succinic acid was nearly baseline separated from the peak of fluoride ions. The peaks of anions of malic and formic acids were poorly separated from the peak of fluoride ions. The peak of tartaric acid was not separated from the peak of fluoride ions. It is shown that the anions of studied acids were baseline separated with the peak of fluoride ions when the difference between their effective electrophoretic mobility and mobility of fluoride ions was above or equal to 1.5·10-9 m2·V-1·s-1