| Ionic liquids,because of their non-toxic and non-polluting characteristics,are valued and studied by many chemical workers,and bring new opportunities for the development of chemical industry.The UV quantitative analysis of the ionic liquid HP-NO3,HEP-NO3 and OP-NO3 in the alkyl nitrate pyridine system was carried out in the experiment.The infrared quantitative analysis of the ionic liquids EP-NO3,PP-NO3,BP-NO3,AP-NO3,HP-NO3,HEP-NO3,OP-NO3 in the acetonitrile as the solvent for the ionic liquid of the alkyl pyridine nitrate system was carried out by infrared quantitative analysis.The fluorescence spectra of two ionic liquids AP-NO3 and HP-NO3 were analyzed under different conditions.The ultraviolet quantitative analysis was carried out on the different concentrations of alkyl pyridine ionic liquids HP-NO3,HEP-NO3,OP-NO3 in ethanol and acetonitrile as solvents.The ultraviolet absorption spectrum curve and the quantitative curve are obtained at room temperature,and the standard curve is plotted and the recovery rate is calculated,and the recovery range of the added standard is 97.1%-104.6%.The infrared spectra of seven ionic liquids,such as EP-NO3,PP-NO3,BP-NO3,AP-NO3,HP-NO3,HEP-NO3 and OP-NO3,were quantitatively analyzed with acetonitrile as solvent,The concentration and Absorbance value can be expressed linearly according to Lambert-beer law,and can be a=kc+m by equation.The best quantitative analysis peaks require that the absorbance value increase with the change of concentration,and its absorbance value and concentration need to have a higher correlation degree.That is,the correlation coefficient of M represented in the equation a=kc+m and the slope of K represent will be very large,therefore,the slope and correlation coefficients of each wave number can be calculated by least squares method,the standard working curve is plotted according to the absorbance value of the maximum peak,the recovery rate of the experiment is calculated,and the recovery range of the added standard is 98.8%-101.6%.The experimental results show that the quantitative standard working curve drawn according to the selected analysis peak absorbance has higher correlation coefficient,and has better its plus sign standard recovery rate.The fluorescent spectrophotometer was used to analyze the fluorescence of alkyl nitrate pyridine system ionic liquids under different conditions,and the experimental results showed that different solvents,different proportions of solvents and different ph conditions would have a certain effect on the fluorescence intensity of ionic liquids. |
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