Determination of Aromatic Amines by Sedimentation Accelerated-Inorganic Salt-Dispersive Liquid-Liquid Microextraction-Capillary Zone Electrophoresis

A new dispersive liquid-liquid microextraction (DLLME) was developed on the basis of two phenomena, chloroform can be generated by the reaction of chloral hydrate and sodium hydroxide, and the chloroform droplets dispersed into bulk aqueous solution can be swiftly carried to the bottom of the centrifuge tube with the addition of calcium chloride. The advantages of the new DLLME lie in dispersive solvent free and centrifugation operation compared with the conventional DLLME. Three common aromatic amines were chosen as the analytes to verify the feasibility of the new DLLME method. These compounds were analyzed by capillary zone electrophoresis (CZE) with the background electrolyte aqueous solution containing 80 mmol/L H[sub 3]PO[sub 4] + 60 mmol/L Tris (pH=2.6). The average recoveries for three compounds were within 80.7%-110.2% when tap water and rain water were analyzed.