Purity testing of sulfonic acids of different chain length by capillary electrophoresis

Abstract

A CZE method has been developed for the purity testing of sulfonic acids. By use of an optimized electrolyte system, short analysis times and high resolution (R S=2–4) can be achieved for inorganic anions and for alkyl sulfonic acids from methane-1- to decane-1-sulfonic acid. By use of indirect UV detection by-products of different sulfonic acids can be determined at the 2 m level, equivalent to 0.02%,w/w.