A novel acrylamide modified primary-secondary amine analogue as impurities remover for determination of carbendazim and dimethyl phthalate in apples

摘要

A novel acrylamide modified Primary-Secondary Amine (PSA) analogue (acrylamide/3-aminopropyltriethoxysilane/ silica) was prepared and used as impurities remover for pesticide residues (carbendazim and dimethyl phthalate) in apples by QuEChERS combined with pipette-tip micro solid-phase extraction method. The properties of acrylamide/3-aminopropyltriethoxysilane/silica were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy. Under the optimized conditions, factors such as amount and type of adsorbents were investigated. The limit of detection and limit of quantity of the method were 0.012 μg/mL and 0.04 μg/mL for carbendazim, 0.023 μg/mL and 0.08 μg/mL for dimethyl phthalate, respectively. The recoveries of proposed method at three spiked levels analysis were 84.9–90.0% for carbendazim and 84.1–88.2% for dimethyl phthalate, respectively, with the relative standard deviation less than 2.9%. The acrylamide/3-aminopropyltriethoxysilane/silica as potential adsorbent showed strong ability for removing the matrix, and it achieved great ability to retain the targets. It will provide a new material choice for detecting pesticide residues in apple samples.