Abstract
Direct derivatisation of fifteen phenylurea herbicides with heptafluorobutyric anhydride (HFBA) has been studied. Quantitative conversion is obtained within 1 h at 60°C, using hexane as solvent. The nuclear magnetic resonance and mass spectrometric characteristics of the HFB-herbicides are reported, as well as their behaviour in adsorption high-performance liquid chromatography and capillary gas chromatography; detection limits are of the order of 50 pg and 1 pg, respectively, using electron-capture detection. Applications to water and crop samples are reported.
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