Capillary zone electrophoresis with indirect UV detection of organic anions using 2,6-naphthalenedicarboxylic acid

Abstract

2,6-Naphthalenedicarboxylic acid (NDC) was characterized as a carrier electrolyte for a separation of organic anions by capillary zone electrophoresis (CZE) with indirect UV detection. Parameters which influence CZE separations such as concentration of NDC, electrolyte pH and various electroosmotic flow modifiers were investigated. The sensitivity obtained with the NDC electrolyte was five times higher than with phthalate, which is commonly used for the separation of organic anions. This method was applied to the determination of organic anions in the ambient air.