Abstract
Our recent method based upon liquid-solid extraction of pesticides from drinking water followed by high-performance liquid chromatography (HPLC) was modified tomake it suitable for monitoring 89 pesticides in ground-water and river water. The modified method involved passing 2, 1.5, and 0.5 L, respectively, of drinking water, groundwater, and river water through a 300-mg Carbopack cartridge at 120-130 mL/min. The complete separation of base-neutral pesticides from acidic ones was accomplished by a stepwise elution. After concentration of the two extracts, pesticides were separated and quantified by reversed-phase HPLC with UV detection
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