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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 determination of ionic liquids by ultraviolet spectrophotometry, three kinds of ionic liquids [C4mim] [PF6], [C6mim] [PF6 ], [C4mim] [BF4] content. The maximum absorption wavelength of three kinds of ionic liquids was studied in the wavelength range of 190 ~ 300 nm, and the effects of several common inorganic salts on the absorption of UV spectra were also investigated. When the SPE method was used to enrich 100 mL water samples, the enrichment factor F = 100/3, the enrichment rates of the three ionic liquids were 90%, 91% and 51%, respectively. Set rate has a certain impact. The recoveries of this method were over 90% when the ionic liquids were spiked at 0.01, 0.05 and 0.10 mg / L, respectively.