This study is devoted to determining ethanol concentration in gasoline using a measurement of aggregation-induced emission which is a phenomenon where nonemissive in solutions molecules, such as 5-(4-dimethylaminobenzylided)barbituric acid (I) or 2,2'-bis(hydroxy-1,1'-naphtalazine) (II) are induced to emit efficiently when they aggregate in poor solvents. The proposed method consists of two steps. First of them includes extraction of ethanol from gasoline-ethanol mixture (90%) with water (10%). Second step includes an addition of non-fluorescent solutions of compounds I or II in N-methyl pyrrolidone to the aqueous extract (1:5 v/v) and measuring the intensity of fluorescence at wavelength 530 nm and 644 nm, respectively. The exact concentration of ethanol in tested sample is established from comparison of its emission intensity with intensity of fluorescence measured for a calibration sample obtained under identical conditions with a water-ethanol solution having a known concentration of ethanol.

Novel fluorescent method of determining ethanol concentration in gasoline based on observation of aggregation-induced emission

248th National Meeting (2014)

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