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 tri azines and dinitroanilines in real water matrices is suggested based o n a preliminary adsorption on an RP 18 cartridge, an elution step usin g acetonitrile and HPLC separation with a Lichrosorb RP-Select B colum n and UV detection. The washing step cartridge is critical for triazin es: terbutryn is eluted with quantitative recovery only after washing with an NH, solution. The degree of enrichment of the compounds studie d has been determined: triazine recoveries are quantitative, while din itroaniline recoveries are between 66% and 78% at the lowest fortifica tion level. The detection limits for the ten herbicides are in the ran ge 0.03-0.1 mu g/l. The analysis time is 2 h.