南京大气PM10谱分布和细粒子中多环芳烃的研究

文章使用分级采样器采集夏秋两季南京市不同功能区的大气PM10样品,运用GC-MS等方法,研究细粒子中的多环芳烃(PAHs)的分布特征和污染来源。结果表明:各功能区秋季细粒子质量浓度均大于夏季,本底区细粒子质量浓度最低,为41.7～59.0μg/m3;交通商业区浓度最高,为206.5～467.0μg/m3。各功能区PM1...

Spectral Distribution Characteristics in PM_(10) and PAHs in Fine Particles from Different Districts in Nanjing City

Different PM10 samples were collected at different functional areas of Nanjing at summer and fall seasons respectively.Based on GC-MS method,the distribution characteristics of polycyclic aromatic hydrocarbons(PAHs)in PM10 and the source of pollution were studied.Results showed that for all the functional areas,the concentration of fine particles in fall was lower than that in summer.At the background zone the concentration was the lowest,with 41.7~59.0μg/m3,while traffic and commercial area had the highest concentration of 206.5~467.0μg/m3 which was 4 times than that at the background area.PM10 particles in most functional area appear bimodal distribution,and PM10 mass concentrations are related with both coarse and fine particles.PAHs concentration of fine particles in summer are significantly lower than that in autumn,PAHs in PM2.1 are mostly adsorbed on the PM1.1.Fine particles in PAHs in summer and autumn have apparent distribution characteristics in space and time,with summer low-ring PAHs content of functional areas to be significantly less than in autumn,the background zone is mainly 4 ring in autumn,in summer to 2 ring,the mixing zone and industrial area are mainly 2 rings in fall,5 rings mainly in summer.Traffic and commercial area is mainly 3 ring PAHs in summer and 4 rings in fall.Adopting source identification parameters method to analyze the source of PAHs of fine particles in different functional atmosphere areas in Nanjing,it has found that PAHs mainly come from the incomplete combustion of fossil fuels. Back trajectory analysis showed that the seasonal migration of air mass track can affect the distribution of air pollutants.