Accurate measurements of pesticide levels in the environment are necessary to set policies, yet actual analytical methods are limited by the use of toxic solvents and tedious procedures. Here, we used a thermo-switchable deep eutectic solvent, a mixture of oleic acid and lidocaine in dispersive liquid–liquid microextraction to improve the extraction of four organophosphorus pesticides and five pyrethroids in simulated water samples. Concentrations were measured by high-performance liquid chromatography. Results show that the deep eutectic solvent can be dispersed by shaking and aggregated by heating in the water during the extraction process, which shortened the extraction time to 5 min. Concentrations were measured with good precision, 0.8–9.7% standard deviation, and low detection limit of 0.16–0.81 µg L⁻¹. Analysis of natural river waters spiked with pesticides showed 81–113% recovery.

准确测量环境中的农药水平对于制定政策是必要的，但实际的分析方法受到有毒溶剂的使用和繁琐程序的限制。在这里，我们在分散液-液微萃取中使用可热切换的低共熔溶剂、油酸和利多卡因的混合物来改进模拟水样中四种有机磷农药和五种拟除虫菊酯的萃取。通过高效液相色谱法测量浓度。结果表明，深层共晶溶剂在萃取过程中可以通过摇晃分散和在水中加热聚集，从而将萃取时间缩短至5 min。以良好的精度、0.8–9.7% 的标准偏差和 0.16–0.81 µg L ^{-1的低检测限测量浓度}. 对添加农药的天然河水的分析表明回收率为 81-113%。