【摘要】 通过对异辛烷、汽油和甲缩醛的红外谱图进行分析,确定了1 145 cm–1处吸收峰作为甲缩醛的红外定量谱带。基于朗伯–比耳定律,分别采用0.1,0.2,0.5 mm光程池,对系列浓度标准溶液进行吸光度的测定,建立校准曲线,适合定量的溶液浓度范围分别为0.2~4.2,0.1~2.2,0.1~0.9 g/L;线性方程分别为Y=0.070X+0.001,Y=0.136X+0.001,Y=0.322X+0.002;相关系数分别为0.999 5,0.999 8,0.999 7。质量浓度在0.1~2.2 g/L之间的试样溶液应优先采用0.2mm光程池,测定结果的相对误差小于5%,重复性相对标准偏差小于2.0%(n=6)。更多还原

【Abstract】 The infrared spectrum of isooctane, gasoline and methylal was analyzed with the result that the absorption peak of 1 145 cm–1 was appropriate for quantitative analysis of methylal in gasoline. The calibration curves were established respectively on Lamber–Beer equation law by 1 145 cm–1 peak absorbency of standard methylal solution with 0.1, 0.2 and 0.5 mm pathlength cells. The linear equation were Y=0.070X+0.001, Y=0.136X+0.001, Y=0.322X+0.002 with the correlation coefficents of 0.999 5,0.999 8,0.999 7, respectively. It was preferential to use 0.2 mm pathlength cell to quantitatively analyze methylal solution with the concentration between 0.1 g/L and 2.2 g/L, and the relative error of test results was less than 5%, and the relative standard deviation of repeatability was less than 2.0%(n=6).更多还原