摘要
采用色谱—质谱联用中的 SIM(Selected Ion Monitor)方式选择性检测汽油机排气中的多环芳香烃 ,以外标法对排气中的多环芳香烃进行定量分析。用该方法能够减少其它有机成分的干扰 ,快速、准确地测量出汽油机排气中多环芳香烃的含量 ,且重复性较好 ,相对标准偏差 (n=8)低于 12 % ,样品回收率为 79%～ 90 %。使用此方法测定 EQ4 91汽油机不同工况下 14种多环芳香烃典型代表物的排放浓度 ,结果表明每种多环芳香烃有机物排放浓度随着发动机工况的不同变化很大 ,其中强致癌物苯并 (a)芘浓度值为 0 .36 μg/m3～ 8.4 5 μg/m3。
The selected ion monitor of GC-MS was used to selectively measure the polycyclic aromatic hydrocarbons (PAHs) in gasoline engine exhaust emissions.The PAHs in gasoline engine exhaust emissions were analyzed quantitatively with the external standard method.Using this method,there was less interference of other soluble organic fractions,meanwhile the PAHs in gasoline engine exhaust emissions can be determined with high sensitivity and rapidity.The relative standard deviation (n=8) of 14 PAHs was less than 12%,and the recoveries of 14 PAHs ranged from 79%to 90%.14 PAHs in the exhaust emissions of EQ491 gasoline engine were measured with this method,and the experimental data showed that the concentrations of PAHs,among which the concentration of BaP ranged from 0.36 μg/m 3 to 8.45 μg/m 3,in gasoline exhaust emissions were different under various working conditions.The content of PAHs in the exhaust emissions of carburetor gasoline engine was greatly higher than that in the exhaust emissions of turbocharged diesel.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2002年第3期238-242,共5页
Transactions of Csice
基金
天津市自然科学基金资助项目 (0 0 360 4 51 1 )
关键词
汽油机
多环芳香烃
排放特性
色谱-质谱联用
离子监测
测量
Gasoline engine
Polycyclic aromatic hydrocarbon
Gas chromatography mass spectrum
Selected ion monitor
