红外光谱法测定汽油中的甲缩醛  

Determination of Methylal in Gasoline by Infrared Spectroscopy

作　　者：华正江[1] 方敏[1] 任飞[1] 袁丽凤[1] 

机构地区：[1]宁波出入境检验检疫局,浙江宁波315012

出　　处：《化学分析计量》2014年第4期20-22,共3页Chemical Analysis And Meterage

基　　金：宁波出入境检验检疫局科技计划项目(甬K13–2013)

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1145 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0.9995，0.9998，0.9997。质量浓度在0.1～2.2 g／L之间的试样溶液应优先采用0.2 mm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）。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）.

关 键 词：红外光谱 汽油 甲缩醛 

分 类 号：O657.33[理学—分析化学]