Synthesis of MOF-۵ Modified Bi۲WO۶ Polyoxometalate Accommodated on the Pores of Hollow Fiber for HF-SPME of Acetamiprid, Abamectin and Diazinon and their Determination by High Performance Liquid Chromatography-Ultraviolet

In this study, metal organic framework-۵/ Bi۲WO۶ (MOF-۵/Bi۲WO۶) composite was synthesized for using in hollow fiber solid phase microextraction (HF-SPME) for separating acetamiprid, abamectin, and diazinon as the model compounds. To use the prepared adsorbent in the HF-SPME configuration, propylene hollow fiber was soaked in the methanolic mixture of adsorbent for accommodating the sorbent inside the pores of hollow fiber. In the next step, various parameters were optimized. Under optimal condition, the linear ranges for measuring acetamiprid, abamectin and diazinon were ۰.۲-۱۰۰ µg L-۱, ۰.۲-۱۰۰ µg L-۱, and ۰.۵-۲۰۰ µg L-۱, respectively. The coefficients of determination (R۲) were ۰.۹۹۶۱ to ۰.۹۹۸۲. The limits of detection (LODs) of the method for acetamiprid, abamectin, and diazinon were ۰.۰۶, ۰.۰۵, and ۰.۱۴ μg L-۱, respectively. Moreover, the enrichment factors (EFs) were ۶۴, ۶۶, and ۶۲ for acetamiprid, abamectin, and diazinon, respectively. In addition, the absolute recoveries (ARs%) were in the range of ۶۲-۶۴%. Relative standard deviation values (RSD%) for the concentration of ۲.۰ μg L-۱ , ۱۰ μg L-۱, and ۱۰۰ μg L-۱ of acetamiprid were between ۱.۱% and ۴.۷%, for abamectin between ۱.۱% and ۴.۵% and for diazinon between ۱.۷% and ۳.۰%. Finally, the proposed method was used to determine acetamiprid, abamectin and diazinon in orange, quince, pomegranate, and agricultural water. The results showed that the percentage of relative recovery of these toxins in the real samples studied was between ۸۹ and ۱۰۲.

Keywords:

Pesticides , Solid phase microextraction , experiment design , MOF-۵/Bi۲WO۶ composite , Hollow Fiber