【作者】 于国光； 王铁冠； 吴大鹏； 王娟；

【Author】 YU Guoguang WANG Tieguan~* WU Dapeng WANG Juan China University of Petroleum-Beijing,Beijing,102249

【机构】 中国石油大学(北京)；

【摘要】 作者采集了北京市春、夏、秋、冬四个季节的 PM₁₀和 PM_2．5颗粒物样品。用色谱-质谱技术,对美国环保总局推荐的18种优控多环芳烃进行了检测和定量。研究结果表明：北京地区 PM₁₀质量浓度的年均值为0．1569 mg/m³,可吸入颗粒物污染比较严重；PM_2．5质量浓度的年均值为0．0955mg/m³,PM_2．5/PM₁₀浓度比的年均值为60．87%,可吸入颗粒物中的 PM_2．5细粒子占了很大比例。PM₁₀和 PM_2．5的质量浓度春季最高,PM_2．5/PM₁₀浓度比为53．80%,粗粒子含量相对较高,可能与春季风大和沙尘暴有关；然后依次为冬季、秋季、夏季的质量浓度。多环芳烃单体浓度在0．10～36．71ng/m³之间,萘、芴、苊等低分子量 PAHs 的含量低,高分子量 PAHs 的含量相对较高,其中苯并[ghi]苝的含量最高；主要分布在 PM_2．5颗粒物中,约在 70%以上；具有季节性变化规律,一般是冬季＞秋季＞春季＞夏季。18种多环芳烃的总浓度与多环芳烃单体浓度具有相同的分布规律；不同环数多环芳烃的浓度为5环＞4环＞6环＞3环＞2环,其中4环和5环芳烃约占总浓度的63%以上,应该是化石燃料燃烧造成的。更多还原

【Abstract】 PM₁₀ and PM_2.5 samples in spring,summer,autumn and winter were collected in Beijing.18 priority PAHs suggested by US EPA were detected and quantified by GC-MS.The average concentration of PM₁₀ in whole year was 0.1569 mg/m³,which showed the pollution of inhaled particles was serious.Furthermore,the average concentration of PM_2.5 was 0.0955 mg/m³ and the average ratio of PM_2.5/PM₁₀ was 60.87%.In the range of inhaled particles,the fine particles(PM_2.5) accounted for much.The concentration of PM₁₀ and PM_2.5 was the highest in spring,and the ratio of PM_2.5/PM₁₀ was 53.80% which indicated the conteat of coarse particles was high relatively.This maybe related with big wind and sandstorm in spring It was followed with winter,autumn and summer.The concentration of individual PAHs was 0.10～36.71ng/m³.The concentration of PAHs of high molecular weight was abundant relatively,and BghiP was the highest.On the other hand,the concentration of PAHs of low molecular weight,such as Nap,Flu,Acy,was very low.With more than 70% in PM_2.5,PAHs were mainly in PM_2.5.The concentration of individual PAHs in different seasons ranged as below:winter＞autumn＞spring ＞summer.The total concentration of 18 PAHs had the same distribution as individual PAHs,and the distribution of PAHs of different rings ranged as below:5 rings＞4 rings＞6 rings＞3 rings＞2 rings.The concentration of PAHs of 4 rings and 5 rings was more than 63% of total PAHs.This maybe attributed to the combustion of fossil fuel.更多还原