Mixed Hemimicelles Solid phase Extraction of Atrazine and Simazine from Environmental Water Samples Using Alumina-Coated Magnetite Composite Material

A sensitive and selective mixed hemimicelles solid phase extraction magnetic material based on sodium dodecyl sulfate-coated magnetite (Fe3O4)/alumina (Al2O3) is proposed for the preconcentration and determination of atrazine and simazine. Atrazine and simazine were preconcentrated on the composite solid phase as an adsorbent and then determined by high performance liquid chromatography. Several parameters influencing the recoveries of the analytes were investigated. The experimental results showed that it was possible to obtain the highest extraction efficiency when the solution pH and extraction time were 1.5 and 1 min, respectively, using 100 mL of validation solution containing 1.0 mu g of triazines and 1 mL of acetonitrile as an eluent. Recoveries of atrazine and simazine were 72 +/- 1% and 77 +/- 3% with relative standard deviations for 5 determinations of 1.6 and 3.8%, respectively, under optimum conditions. The linear ranges of calibration curves for triazines were from 1 to 20 ng/mL with correlation coefficients of 0.995 (atrazine) and 0.991 (simazine) and the detection limits (signal-to-noise ratio of 3) were 0.11 and 0.17 ng/mL for atrazine and simazine, respectively. The proposed method was successfully applied to the determination of triazines in environmental water samples such as river, tap and pond waters with high precision and accuracy.

Automated summary

In this study, a sensitive and selective mixed hemimicelles solid phase extraction magnetic material was proposed for the preconcentration and determination of atrazine and simazine. The results showed that under optimized conditions, the method achieved high extraction efficiency and accuracy for the determination of triazines in environmental water samples.