Combination of ionic liquid dispersive liquid-phase microextraction and high performance liquid chromatography for the determination of triazine herbicides in water samples

A temperature-controlled ionic liquid dispersive liquid-phasemicroextraction in combination with high performance liquid chromatography was developed for the enrichment and determination of triazine herbicides such as cyanazine, simazine, and atrazine in water samples. 1-Octyl-3-methylimidazolium hexafluorophosphate ([C₈MIM][PF₆]) was selected as the extraction solvent. Several experimental parameters were optimized. Under the optimal conditions, the linear range for cyanazine was in the concentration range of 0.5-80 μg/L and the linear range for simazine and atrazine was in the range of 1.0-100 mg/L. The limit of detection (LOD, S/N = 3) was in the ranges of 0.05-0.06 μg/L, and the intra day and inter day precision (RSDs, n = 6)was in the ranges of 3.2%-6.6% and 4.8%-8.9%, respectively. Four real water samples were analyzed with the developedmethod, and the experimental results showed that the spiked recoveries were satisfactory. All these exhibited that the developed method was a valuable tool for monitoring such pollutants.