Potential of microcolumn liquid chromatography and capillary electrophoresis with flame photometric detection for determination of polar phosphorus-containing pesticides

The potential of microcolumn liquid chromatography (mu LC) and capillary el ectrophoresis (CE) with on-line, flame photometric detection (FPD) in the P -selective mode has been studied for determination of polar P-containing pe sticides, glyphosate and its main metabolite, aminomethylphosphonic acid (A MPA), ethephon, fosetyl-aluminium and acephate. Acephate was determined by reversed-phase mu LC-FPD using large-volume injections with peak compressio n, the other compounds were determined by mu LC-FPD and CE-FPD using simple , large-volume injection procedures to obtain limits of detection of 7.5-50 0 ng . mL(-1) and 1.0 mug . mL(-1), respectively. The methods showed accept able repeatability and robustness and were successfully applied for rapid a nd selective determination of pesticides in fruit, vegetable and water samp les.