羟基离子液体磁性氧化石墨烯混合半胶束磁性固相萃取高效液相色谱测定环境水中的除草剂  

Mixed hemimicelles magnetic solid-phase extraction based on hydroxyl ionic liquid-coated magnetic graphene oxide for the determination of herbicides in enviormental water samples coupled with high-performance liquid chromatography

作　　者：郭振福[1] 庚丽丽[1] 王素利[1] GUO Zhenfu;GENG Lili;WANG Suli(Hebei North University,Hebei Key Laboratory of Quality And Safety Analysis-Testing for Agro-Products and Food,Hebei,Zhangjiakou,075000,China)

机构地区：[1]河北北方学院,河北省农产品食品质量安全分析重点实验室,张家口075000

出　　处：《环境化学》2021年第8期2561-2568,共8页Environmental Chemistry

基　　金：河北省自然基金(B2017405049);河北省高等学校科学重点研究项目(ZD2016139);河北北方学院自然科学一般项目(YB2020001)资助.

摘　　要：本文建立了羟基离子液体磁性氧化石墨烯混合半胶束磁性固相萃取高效液相色谱测定环境水中除草剂的分析方法。利用具有大的表面积和较强的吸附能力的羟基功能化离子液体1-羟己基-3-甲基咪唑溴盐(HFIL)包被磁性氧化石墨烯作为磁性固相萃取吸附材料,富集环境水的除草剂。对萃取效率的一些影响因素进行优化,如磁性氧化石墨烯与离子液体的质量比、萃取时间、解吸条件、离子强度等,从而选择最佳萃取条件。在最佳条件下,5种除草剂的平均回收率在81.2%—90.2%之间,相对标准偏差为1.9%—3.9%。浓度在10—500μg·L^(−1)范围内线性良好,相关系数在0.9955—0.9987之间,最小检出限为0.036—0.053μg·L^(−1),并且将建立的方法应用于实际环境水样5种除草剂的测定。In this study,a novel mixed hemimicelles magnetic solid phase extraction method based on hydroxyl ionic liquid-coated magnetic graphene oxide(Fe_(3)O_(4)/GO)was developed for the simultaneous extraction and determination of herbicides in enviormental water samples coupled with high-performance liquid chromatography.Fe_(3)O_(4)/GO after modification with 1-hydroxyl hexyl-3-methylimidazoliumbis bromide(HFIL)has high surface area and excellent adsorption capacity,which were used as magnetic solid-phase extraction(MSPE)adsorbent to enrich herbicides in environmental water samples.The factors affecting the extraction efficiency such as the ratio of the amout of Fe_(3)O_(4)/GO and ionic liquid,extraction time,desorption conditions and ionic strength were investigated to select the best extraction conditions.Under optimal conditions,the recoveries of five target compounds were obtained ranging from 81.2%to 90.2%and the relative standard deviations(RSDs,n=5)were 1.9%—3.9%.Linearities were achieved in the range of 10—500μg·L^(−1) with correlation coefficients ranging from 0.9955 to 0.9987.The limits of detection were in the range of 0.036—0.053μg·L^(−1).The method was successfully applied to the determination of the target five herbicides in the environmental water samples.

关 键 词：磁性氧化石墨烯 羟基离子液体 除草剂 磁性固相萃取 高效液相色谱 

分 类 号：O658.2[理学—分析化学] O657.72[理学—化学] X832[环境科学与工程—环境工程]