An emulsification liquid–liquid microextraction (ELLME) method was successfully developed using phenolic-based deep eutectic solvent (DES) as an extraction solvent for the determination of phenoxy acid herbicides, 3,6-dichloro-2-methoxybenzoic acid (dicamba) and 2-methyl-4-chlorophenoxyacetic acid (MCPA) in environmental water samples. Five different phenolics-based DESs were successfully synthesized by using phenol (DES 1), 2-chlorophenol (DES 2), 3-chlorophenol (DES 3), 4-chlorophenol (DES 4) and 3,4-dichlorophenol (DES 6) as the hydrogen-bond donor (HBD) and choline chloride as the hydrogen-bond acceptor (HBA). The DESs were mixed at 1 : 2 ratio. A homogeneous solution (clear solution) was observed upon the completion of successful synthesis. The synthesized DESs were characterized by using Fourier transform infrared and nuclear magnetic resonance (NMR). Under optimum ELLME conditions (50 µl of DES 2 as extraction solvent; 100 µl of THF as emulsifier solvent; pH 2; extraction time 5 min), enrichment factor obtained for dicamba and MCPA were 43.1 and 59.7, respectively. The limit of detection and limit of quantification obtained for dicamba were 1.66 and 5.03 µg l⁻¹, respectively, meanwhile for MCPA were 1.69 and 5.12 µg l⁻¹, respectively. The developed ELLME-DES method was applied on paddy field water samples, with extraction recoveries in the range of 79–91% for dicamba and 82–96% for MCPA.

采用酚基深共熔溶剂（DES）作为萃取溶剂测定苯氧基酸除草剂，3,6-二氯-2-甲氧基苯甲酸（麦草畏）和2的乳化液-液微萃取（ELLME）方法已成功开发环境水样品中的-甲基-4-氯苯氧基乙酸（MCPA）。通过使用苯酚（DES 1），2-氯苯酚（DES 2），3-氯苯酚（DES 3），4-氯苯酚（DES 4）和3,4-二氯苯酚（DES 6）成功合成了五种不同的基于酚类的DES。作为氢键供体（HBD）和氯化胆碱作为氢键受体（HBA）。将DES以1：2的比例混合。成功完成合成后，观察到均相溶液（澄清溶液）。通过傅立叶变换红外和核磁共振（NMR）对合成的DES进行表征。在最佳ELLME条件下（50μl的DES 2作为萃取溶剂； 100μl的THF作为乳化剂溶剂； pH 2；萃取时间5分钟），麦草畏和MCPA的富集系数分别为43.1和59.7。麦草畏的检出限和定量限分别为1.66和5.03 µg l同时，对于MCPA，^-1分别为1.69和5.12 µg l ^-1。发达的ELLME-DES方法应用于稻田水样，麦草畏的提取回收率在79-91％之间，MCPA的提取回收率在82-96％范围内。