Determination of Triazine Herbicides in Environmental Water Samples by Acetonitrile Inorganic Salt Aqueous Two-Phase Microextraction System

Acetonitrile inorganic salt aqueous two-phase extraction method was established for the determination of triazine herbicides (simeton, cyanazine, desmetryn, terbumeton, terbuthylazine and dimethametryn) in environmental water samples by high-performance liquid chromatography (HPLC). The extraction solvents types and volume of acetonitrile, the inorganic salt types and amount of (NH4)(2)SO4, extraction time and pH of sample solution were optimized by single-factor experiment and central composite design. Under the optimum extraction conditions, all linear ranges were obtained with coefficients of determination (r)0.9993. The limits of detection for this proposed method were in the range of 0.16-0.28g/L for six triazine herbicides. The developed method has been successfully applied to the analysis of target triazine herbicides from lake, canal and moat in real-world water samples. The recoveries of target analytes were in the range from 87.0 to 110.9% and the relative standard deviation was lower than 7.3%.