顶空-气相色谱法测定修正类产品中10种苯类溶剂残留

Determination of 10 Kinds of Benzene Solvents Residues in Modified Products by Headspace-Gas Chromatography

建立了顶空-气相色谱法测定修正类产品中10种苯类溶剂残留的分析方法,通过优化样品前处理过程和色谱条件,10种苯系化合物的线性相关系数均大于0.999,方法定量下限（S/N=10）为0.924～1.044mg/kg,回收率为83.5%～118.5%,相对标准偏差为1.8%～8.2%。该方法具有节省溶剂、快速、重复性好、易操作等特点。通过实验发现,部分修正液在一定温度下挥发出大量的甲苯、二甲苯、苯乙烯和一定量的1,2,4-三甲苯等,且环境温度越高,苯类物质的挥发量越高。

A headspace - gas chromatographic method was established for the determination of 10 kinds of benzene solvent residues in modified products. By optimizing the sample pretreatment and chromatographic conditions, the linear correlation coefficients of 10 analytes were more than 0. 999, and the quantitation limits （ S/N = 10 ） were in the range of 0. 924 - 1. 044 mg/kg. The recoveries were in the range of 83.5% - 118.5% , with relative standard deviations of 1.8% - 8.2% . The method had the advantages of saving solvent, rapidness, good repeatability and easy operation. The experiment indicated that, under the condition of a certain temperature, correction fluid samples were volatilized a great deal of toluene, xylene, ethylbenzene and styrene, and a certain amount of 1, 2, 4-trimethylbenzene. Forthermore, the higher the temperature varied, the larger the volatile amount of benzene solvents was obtained.