Determination of environmentally relevant aromatic amines in the ppt levels by cation selective exhaustive injection-sweeping-micellar electrokineticchromatography

Environmentally important aromatic amines are determined by micellar electr okinetic chromatography (MEKC) with UV detection. Using a combination of fi eld-enhanced sample injection in the capillary zone electrophoresis format (performed for a longer period than usual, e.g., 200 s at high voltages; ca tion selective exhaustive injection) and sweeping in the MEKC format, from 10(4)- to 10(5)-fold improvements in detector response are achieved for all positively chargeable test analytes. Preliminary results indicate that lim its of detection for the positively chargeable aromatic amines are in the p arts per trillion (ppt) levels.