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长链的溴代咪唑离子液体具有表面活性剂性质,其可以作为光度法中增敏剂使用。采用离子液体溴化十二烷基咪唑盐(C12minBr)作为新型光度增敏剂测定食品中铝(Ⅲ)的含量。在pH为4.8的Britton-Robinson缓冲液中,离子液体C12minBr对Al3+-铬天青体系具有增敏作用,形成Al(Ⅲ)-CAS-C12minBr三元配合物,并在650nm波长处有最大吸收,铝的质量浓度在0.0005～0.050g/mL范围内符合朗伯比尔定律,方法的检出限为0.1ng/mL,表观摩尔吸光系数ε650=1.31×105L/mol·cm。将该法用于罐装啤酒中铝含量的测定,结果与火焰原子吸收光度法测定结果一致,回收率在97.0%～106.0%之间。
Long chain bromoimidazolium ionic liquids have surfactant properties that can be used as sensitizers in photometry. Determination of aluminum (Ⅲ) in food by ionic liquid bromide dodecyl imidazolium bromide (C12minBr) as a new photometric sensitizer. The ionic liquid C12minBr sensitized Al3 + -chromium blue system to Al (Ⅲ) -CAS-C12minBr ternary complex at pH4.8 in Britton-Robinson buffer with the maximum absorption at 650nm, The concentration of aluminum in the range of 0.0005 ~ 0.050g / mL accords with Lambertil’s law. The detection limit of this method is 0.1ng / mL, and the apparent molar absorptivity ε650 = 1.31 × 105L / mol · cm. The method was applied to the determination of aluminum content in canned beer. The results were consistent with the results of flame atomic absorption spectrometry. The recoveries ranged from 97.0% to 106.0%.