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建立了气相色谱-硫化学发光检测器联用法(GC-SCD)同时测定车用汽油中噻吩、2-甲基噻吩、3-甲基噻吩、3-甲基苯并噻吩、5-甲基苯并噻吩含量的分析方法。选择甲基硅氧烷毛细管色谱柱作为分离柱,考察了色谱条件对车用汽油中噻吩类硫化物分离的影响,确定了合适的SCD检测条件,对噻吩类硫化物进行了准确定性分析。车用汽油中5种噻吩类硫化物的添加回收率在83.56%~115.10%之间,相对标准偏差(RSD)在0.54%~5.54%之间,各待测物在0.50~150.0 mg/L质量浓度范围内呈现良好的线性关系,相关系数在0.996 2~0.999 6之间,样品中各待测物检出限在0.17~0.36 mg/kg之间,能够满足车用汽油中微量噻吩类硫化物的定量检测需求。
The simultaneous determination of thiophene, 2-methylthiophene, 3-methylthiophene, 3-methylbenzothiophene and 5-methylbenzene in automotive gasoline by gas chromatography-sulfur chemiluminescence detector And thiophene content analysis method. Methyl silicone capillary column was selected as the separation column. The influence of chromatographic conditions on the separation of thiophenes in gasoline was investigated. The suitable conditions for the determination of thiophene sulfide were determined and the accurate qualitative analysis of thiophenes sulfides was carried out. The recoveries of five thiophene sulfides in benzine gasoline ranged from 83.56% to 115.10%, the relative standard deviations (RSDs) ranged from 0.54% to 5.54%, and the analytes ranged from 0.50 to 150.0 mg / L The correlation coefficients ranged from 0.996 2 to 0.999 6, and the detection limits of all analytes in the sample ranged from 0.17 to 0.36 mg / kg, which could meet the requirements of trace thiophenes sulfides Quantitative detection needs.