Method development for the analysis of pesticides on a nitrophenol basis

Pesticides on a nitrophenol basis and nitrophenols which may be formed by biotransformation from other plant-protecting agents may be extracted from aqueous samples with high recoveries by continuous liquid/liquid extraction using a rotary perforator and by solid phase extraction, respectively. Determination of these compounds in possible by high performance liquid chromatography with photodiode array detection where identification is based both on the retention time and the UV spectra. Alternatively, a gas chromatographic analysis after derivatization with heptafluorobutyric anhydride has been evaluated.