Dispersive solid-phase extraction based on β-cyclodextrin grafted hyperbranched polymers for determination of pyrethroids in environmental water samples

A method was developed using dispersive solid-phase extraction based on hyperbranched polymer functionalized with beta-cyclodextrin for extraction and enrichment of three pyrethroid pesticides (fenpropathrin, cyhalothrin, and ethofenprox) in environmental water samples before high-performance liquid chromatography analysis. The aim of this research was to establish a simple, high-speed, effective, and sensitive method for the detection of target analytes. The as-prepared sorbents were synthesized successfully, and characterized by scanning electron microscopy, energy dispersive spectroscopy, elemental analysis, Brunauer-Emmett-Teller measurement and Fourier transform infrared spectroscopy. The experimental factors influencing the extraction efficiency such as extraction time, pH, ionic strength, desorption conditions, etc. were optimized. Good linearity was observed for all three pyrethroids, and the linear range of fenpropathrin was 10-500 ng/mL, and cyhalothrin, ethofenprox were 5-500 ng/mL. The method detection limits were ranged from 1.0 ng/mL to 2.1 ng/mL under the optimal conditions. The recoveries achieved ranged from 83.1% to 91.6% for the extraction of the three target analytes. Apart from these, the relative standard deviation (intra-day and inter-day) were measured fewer than 6.0%. The method in this work was applied to the rapid enrichment and detection of pyrethroids in environmental water samples.