LIQUID-CHROMATOGRAPHIC DETERMINATION OF N-HERBICIDES IN SURFACE WATERS BY USING DIODE-ARRAY DETECTION AND MULTICOMPONENT ANALYSIS

A multiresidue analysis for twenty-five N-herbicides (1,3,5-triazines and metabolites, phenylurea derivates and substituted anilines) in riv er water samples with PP-HPLC is described. Sample preconcentration an d clean up was done by solid phase extraction. Recovery rates of most herbicides were higher than 80% at the optimum pH value, and detection limits much lower than the maximum permissible concentration of 0.1 m ug/l. By the use of diode array detection and multi-component analysis a high security was reached for substance identification and quantita tion.