▎ 摘　　要

In this work, nanocomposites of reduced graphene oxide coated with ZnO were synthesized using a hydrothermal reduction strategy. Nanocomposite was then used as a sorbent for microextraction in a packed syringe, and its application to the extraction of carbamate pesticides from juice samples prior to high-performance liquid chromatography detection was demonstrated. Factors affecting the enrichment efficiency of the microextraction in a packed syringe procedure were optimized, which included desorption conditions, sample pH, salting-out effect, washing solution, and sample cycles. Under optimal conditions, the prepared materials exhibited excellent enrichment efficiency for carbamate pesticides. Good linearity existed in the concentration range of 0.5-200 ng/mL, with correlation coefficients of 0.9991-0.9997. The limits of detection of these carbamate pesticides were in the range of 0.23-1.21 ng/mL, and the average recoveries of the analytes at two spiked levels for real-sample analysis ranged from 90.5 to 104.2% with relative standard deviations of 3.6-5.9%.