磁性离子液体石墨烯-固相萃取水中三嗪类除草剂

Solid phase extraction triazine herbicide in water with magnetic ionic liquid graphene

采用微乳共沉淀法制备磁性离子液体石墨烯(MILG),将其作为磁性固相萃取吸附剂,结合超高效液相色谱-串联质谱法实现对环境水样中7种三嗪类除草剂的定量分析。通过对影响因素的优化,在中性溶液中采用10 mg MILG作为萃取剂,吸附20 min萃取效果最佳。7种三嗪类除草剂的检出限为1.1~2.8 ng/L,实际水样中加标回收率为57.8%~101.2%,相对标准偏差在9.1%以内。

The magnetic ionic liquid graphene(MILG)was synthesized by microemulsion coprecipitation method and used as the magnetic solid-phase extracts.Quantitative analysis of seven types of triazine herbicides in environmental water samples was investigated by ultra-high-performance liquid chromatography tandem mass spectrometry.Under the neutral solution,the optimal extraction efficiency was obtained when the extracting amount of MILG and adsorption time was 10 mg and 20 min,respectively.The limits of detection of the method ranged from 1.1 ng/L to 2.8 ng/L for 7 types triazine herbicides.The proposed method was applied to the extraction of triazine herbicide in actual water samples,the recovery was between 57.8%-101.2%,and RSD was less than 9.1%.