[Analysis of carbaryl and other pesticides by capillary electrophoresis]

Five pesticides, i.e. carbaryl, simazine, atrazine, arnetryne and prometryn were separated by capillary electrophoresis technique. The effects of experimental parameters including pH, the concentration of surfactant and organic modifier on the separation were investigated. From the experiments, we found the optimum electrophoretic conditions were as follows: 20 mmol/L borate-50 mmol/L sodium dodecyl sulfate-10% methanol (volume fraction) as the running buffer (pH 9.2), applied voltage of 25 kV, detection wavelength of 225 nm. Under the optimum conditions, baseline-separation of each component has been obtained using anionic surfactant for micellar electrokinetic chromatography. The results indicated that the calibration curve of carbaryl was linear in the range of concentrations 30 mg/L-200 mg/L. This method has been applied to the determination of real sample with satisfactory results obtained, and the recovery of carbaryl was 93.4%-101.3%, and the relative standard deviation of peak area was 2.59%.