Application of reversed phase short end-capillary electrochromatography to herbicides residues analysis.

Reversed phase capillary electrochromatography was applied to the determination of phenylurea herbicides residues in different samples of vegetables and vegetable processed food. The use of 40% acetonitrile mobile phase content provided a large elution window and strongly reduced the presence of matrix interferences in real samples. The compounds were baseline resolved within 14 min with 97612-113312 N/m range by using the short end injection method. The method was repeatable and linear and applied to the analysis of spiked soya milk and canned soya shoots samples extracted after a reduced sample pretreatment procedure. The analysis of vegetables showed some difficulties arising from the complexity and the strong variability of the matrix.