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A novel multi-functional adsorbent (RP-SAX adsorbent) bearing hydrophobic and anion exchange groups was synthesized for the simple and rapid determination of residual acephate (AP) in vegetables. Macroporous base resin was obtained by suspension copolymerization with glycidyl methacrylate, stearyl methacrylate and glycerin dimethacrylate, and then ethyldimethylamine was introduced at glycidyl groups on the base resin. The adsorbent was packed into a syringe-type tube and used for extraction of AP. AP in the vegetable extract was quantitatively entrapped on the adsorbent and was completely eluted with 3 mL of 30 mmol/L trisodium phosphate in 50% (v/v) methanol solution. The eluate was directly injected into an HPLC-UV detection system with a reverse-phased column. The recoveries of 5 mg/L AP spiked in vegetable extraction samples ranged from 77% to 100%.

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Development of a Novel Multi-functional Adsorbent Bearing with Long-Chain Hydrophobic and Anion Exchange Groups for the Simple and Rapid Determination of Residual Acephate in Vegetables