▎ 摘　　要

Silica and graphene oxide were separately modified by using three different kinds of silane coupling agents, including (3-chloropropyl)-trimethoxysilane (NQ54), 3-methacryloxypropyltrimethoxysilane (KH570), and (3-aminopropyl) triethoxysilane (KH550). The characterization of obtained materials was tested by Fourier transform infrared spectroscopy and scanning electron microscopy, and the electronegativity was determined by Zetasizer Nano ZSP. The obtained materials were used to determine the sulfamerazine and sulfameter by ultrasonic-assisted dispersive solid-phase extraction. The static sorption experiment showed that the graphene oxide modified by NQ54 had a good sorption ability for two targets. Under the optimal condition, a reliable analytical method was developed for high recognition towards two targets in milk by NQ54-modified graphene oxide with satisfactory extraction recoveries (sulfamerazine 96.75% and sulfameter 94.08%, respectively). The recoveries of proposed method at three spiked levels were 92.16-101.71% and 92.95-103.81%, respectively, with the relative standard deviation less than 3.20%. It was indicated that graphene oxide modified by NQ-54 showed better performance for two targets, and the proposed method had been successfully applied for the determination of sulfonamides sample in milk.