摘要
采用底盘测功机模拟汽车的加速、减速、匀速和怠速过程,采集了机动车排放的尾气,并对尾气中颗粒态物质和气态物质的多环芳烃含量进行了分析.结果表明,柴油车和汽油车无论在何种工况下,尾气中低环多环芳烃在气态物质中的含量都要高于在颗粒态物质中的含量;中环多环芳烃在气态物质中和颗粒态物质中的含量相接近;高环多环芳烃在颗粒态物质中的含量要高于气态物质中的含量.机动车尾气中PAHs的苯并[a]芘等效致癌浓度(BaPE)在0.558 ～5.684之间,BaPE/BaP比值在2.029 ～8.413之间,即BaP以外的多环芳烃贡献了相当于103%～741%BaP浓度的等效致癌毒性;尾气中气态物质和颗粒态物质的PAHs总量和苯并[a]芘含量的回归分析表明两者之间存在着较好的线性关系,其可决系数分别为0.8343和0.7158.
In this paper, the exhaust emissions of motor vehicles were collected under the automobile accelerating, decelerating, uniform and idling process on a chassis dynamometer, and the concentration of polycyclic aromatic hydrocarbons of particulate matter and gaseous substances in the collected exhaust gas have been analyzed. The results showed that in whatever condition where the diesel and gasoline vehicles work, the concentration of PAHs in the gaseous substances was higher than that in the paniculate material in lower polycyclic of the exhaust gas and was close to it in middle polycyclie. However, the concentration of PAHs in the gaseous substances was lower than that in the particulate material in high polycyclic. The BaPE of the PAHs exhausted by automobiles was between 0. 558- 5. 684 and the ratio of BaPE/BaP was between 2. 029 - 8. 413. In other words, the PAHs besides BaP contributed to equivalent carcinogenic toxicity equivalent to 103% -741% concentration of BaP. The regression analysis showed that there was a good linear relationship between PAHs and BaP concentrations of paniculate matter and gaseous substances in exhaust gas, with the agreed coefficient being 0. 8343 aud 0.7158 respectively.
出处
《环境科学学报》
CAS
CSCD
北大核心
2008年第12期2493-2498,共6页
Acta Scientiae Circumstantiae
基金
江苏省自然科学基金重点项目(No.BK2004216)~~
