固相萃取-紫外光谱法测定水样中咪唑类离子液体的含量  

Determination of ionic liquids in water samples by ultraviolet spectroscopy with solid phase extraction

作　　者：张婧[1] 赵文岩[1] 孙艳红[1] 其布日[1] 赵洋[1] 

机构地区：[1]内蒙古大学化学化工学院,呼和浩特010021

出　　处：《分析试验室》2013年第3期65-67,共3页Chinese Journal of Analysis Laboratory

基　　金：内蒙古自治区教育厅重点项目(NJZZ11014);国家自然科学基金(21167008)资助

摘　　要：为了消除无机盐对紫外法测定离子液体的干扰,采用固相萃取(SPE)预富集,再利用紫外光谱法测定了水样中3种离子液体[C4mim][PF6]、[C6mim][PF6]、[C4mim][BF4]的含量。在波长190～300 nm范围内研究了3种离子液体的最大吸收波长,同时还考察了几种常见无机盐对离子液体紫外光谱吸收的影响。采用SPE方法富集100 mL水样时,富集倍数F=100/3,对三种离子液体的富集率分别为90%,91%和51%,并且溶液的pH与盐的浓度对富集率有一定的影响。当离子液体加标浓度分别为0.01、0.05和0.10 mg/L时,该方法的回收率大于90%。In order to eliminate the interference of inorganic salts on the UV method for the determination of the ionic liquids （ILs） , a method for the determination of three kinds of ionic liquids 1-butyl-3-methylimidazolium hexafluorophosphate and 1-hexyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium tetrafluoroborate in water samples by ultraviolet spectroscopy with solid phase extraction for preconcentration was developed. The absorption spectra of the three kinds of ionic liquids were studied over the range of 190-300 nm, and the effect of several common inorganic salts on the UV absorption of the ILs were investigated. The enrichment efficiency of the solid phase extraction （SPE） on the above mentioned ionic liquids were 90% ,91% and 51%, respectively, for enriching 100 mL of water samples, the enrichment time F = 100/3, and pH and salt concentrations of water samples had some effects on enrichment efficiency. The recoveries of the method were more than 90% for the ionic liquids at spiked levels of 0. 01, 0. 05 and 0. 10 mg/L.

关 键 词：离子液体 紫外光谱 固相萃取 

分 类 号：O657.3[理学—分析化学]