DETERMINATION OF TRIAZINES AND DINITROANILINES IN WATERS BY HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY AFTER SOLID-PHASE EXTRACTION

A rapid and selective method for the simultaneous determination of triazines and dinitroanilines in real water matrices is suggested based on a preliminary adsorption on an RP 18 cartridge, an elution step using acetonitrile and HPLC separation with a Lichrosorb RP-Select B column and UV detection. The washing step cartridge is critical for triazines: terbutryn is eluted with quantitative recovery only after washing with an NH, solution. The degree of enrichment of the compounds studied has been determined: triazine recoveries are quantitative, while dinitroaniline recoveries are between 66% and 78% at the lowest fortification level. The detection limits for the ten herbicides are in the range 0.03-0.1 mu g/l. The analysis time is 2 h.