二维中心切割气相色谱法测定车用汽油中醚类、酯类和甲缩醛含量  

Determination of ether,ester,aldehyde contents in motor gasoline by two-dimensional gas chromatography with a heart-cutting System

作　　者：费旭东 魏宇锋[1] 邱丰[1] 吴颖[2] 

机构地区：[1]上海出入境检验检疫局工业品与原材料检测技术中心,上海200135 [2]东华大学化学化工与生物工程学院,上海201620

出　　处：《现代化工》2015年第7期178-181,共4页Modern Chemical Industry

基　　金：国家质检总局科技计划项目(2014IK267)

摘　　要：采用二维中心切割气相色谱法测定了车用汽油中醚类、酯类和甲缩醛的含量。目标化合物经强极性TCEP色谱柱预分离后，再由非极性DB1色谱柱进一步分离，确定了车用汽油中甲基叔丁基醚（MTBE）、乙基叔丁基醚（ETBE）、乙酸仲丁酯、碳酸二甲酯（DMC）和甲缩醛在柱切换和不切换时的保留时间，建立了双柱定性和定量分析方法。各待测物在10～10000mg,／kg范围内呈良好的线性关系，相关系数均大于0．999；样品中各待测物的平均加标回收率在88．41％～114．84％之间，相对标准偏差（RSD，n=7）在0．04％-3．69％之间，方法检出限（LOD）在0．3803～21．1967mg／kg之间。该方法中样品不需要进行前处理，操作简便，灵敏度高，具有良好的重复性和再现性。A new dual-column qualitative and quantitative analysis method involving the combination of strong polar TCEP column and nonpolar DB1 column is established to determine the contents of ether, ester and aldehyde additives in motor gasoline by two-dimensional gas chromatography with a heart-cutting system. The retention time of methyl ten-butyl ether （MTBE） ,ten-butyl methyl ether （ETBE）,methylal,dimethyl carbonate and 1-methylpropyl acetate are confirmed under the column switching and non-switching condition. The linear relation of five target compounds are good in the range of 10 - 10 000 mg/kg and all the correlation coefficient are higher than 0. 999 6. The average recoveries of the additives are in the range of 88. 41% - 114. 84% , and the relative standard deviation （ RSD, n = 7 ） are between 0. 04% - 3.69%. The study shows that the limits of detection （LOD） of five compounds are 0. 380 3 - 21. 196 7 mg/ kg. This method exhibits the advantage of easy-handle, high sensitivity, reliable and good reproducibility.

关 键 词：二维中心切割技术 气相色谱 车用汽油 甲基叔丁基醚(MTBE) 乙基叔丁基醚(ETBE) 碳酸二甲酯 乙酸仲丁酯 甲缩醛 

分 类 号：TE626.21[石油与天然气工程—油气加工工程]