Magnetic Biomass Activated Carbon-Based Solid-Phase Extraction Coupled with High Performance Liquid Chromatography for the Determination of Phenylurea Herbicides in Bottled Rose Juice and Water Samples

A biomass activated carbon (BAC) material was prepared from agricultural waste peanut shells. Through the in situ reduction of Fe3+ and Fe2+, magnetic property was successfully introduced into the prepared BAC, resulting in a novel and environmentally-friendly magnetic BAC (MBAC). The as-obtained MBAC was used as magnetic solid-phase extraction (MSPE) adsorbent for the extraction of four phenylurea herbicides (PUHs) (chlortoluron, isoproturon, monolinuron, and buturon) from river water and bottled rose juice sample prior to their determination by high-performance liquid chromatography-ultraviolet detection. The main experimental parameters that could affect the extraction efficiencies were optimized. Under the optimum conditions, a good linearity was achieved in the concentration range of 1.0–200.0 ng mL−1 for the four PUHs, with correlation coefficient of 0.9986–0.9991. The limits of detection (S/N = 3) of the method were ranged from 0.10 to 0.80 ng mL−1. The results indicated that the prepared MBAC was a low-cost and efficient adsorbent for the MSPE of the PUHs.