College of Plant Protection , China Agricultural University , 2 Yuanmingyuan West Road , Beijing 100193 , People's Republic of China.
Institute of Equipment Technology , Chinese Academy of Inspection and Quarantine , 3 Gaobeidian North Road , Beijing 100123 , People's Republic of China.
J Agric Food Chem. 2018 Sep 12;66(36):9418-9425. doi: 10.1021/acs.jafc.8b03244. Epub 2018 Sep 4.
To elucidate the relationship between the structure of ionic liquid (IL) and its enrichment ability to trace pesticides from an environmental water sample, a series of imidazole-based ILs were synthesized to extract four fungicides (boscalid, cyprodinil, fluazinam, and pyrimethanil) through an in situ ionic liquid dispersive liquid-liquid microextraction method. The results showed that aromatic heterocyclic monocation ionic liquids (MILs) had better extraction ability to fungicides than other three alicyclic heterocyclic MILs. Dication ionic liquids (DILs) with the four carbons at the side chain had better ability to extract fungicides than MILs, and DILs with a long bridge carbon chain had better recoveries of fungicides with low K values. The proposed method showed high mean enrichment factors and high recoveries of the fungicides from real water samples. The rules of the relationship between the structure of IL and enrichment ability are instructive to the application of ILs in pretreatment of complex substances.
为了阐明离子液体（IL）的结构与其从环境水样中富集痕量农药能力之间的关系，合成了一系列基于咪唑的 IL，通过原位离子液体分散液-液微萃取方法提取四种杀菌剂（肟菌酯、咯菌腈、氟啶胺和嘧菌酯）。结果表明，芳香杂环单阳离子 IL（MILs）对杀菌剂的萃取能力优于其他三种脂环杂环 MILs。侧链带有四个碳原子的二价离子液体（DILs）对杀菌剂的萃取能力优于 MILs，而具有长桥碳链的 DILs 对低 K 值杀菌剂的回收率更好。该方法对实际水样中杀菌剂的平均富集因子和回收率较高。IL 结构与富集能力之间关系的规律对 IL 在复杂物质预处理中的应用具有指导意义。
