Simultaneous Determination of Inorganic Anions and Cations in Cosmetics by Capillary Zone Electrophoresis

For thousands of years the extraordinary waters of the Dead Sea have healed and rejuvenated skin because of their unique mineral content. Natural Sea Beauty products use the power of these Dead Sea minerals. The capillary electrophoresis technique based on the electromigrative sample introduction from both ends of the capillary was applied for the simultaneous determination of inorganic anions and cations in the cosmetics of Natural Sea Beauty products. The optimized separations were carried out in 5 mmol/L imidazole and 2 mmol/L nitrate electrolyte neutralized with fumaric acid to pH 4.1, using indirect UV detection at 214 nm. Six inorganic ions (K+, Na+, Ca2+, Mg2+, Br-, Cl-) were well separated in less than 6 min. The comparison of the results with ion chromatography is presented. This method is one of ways used to test different produces.