重庆城区不同粒径颗粒物元素组分研究及来源识别

Element Composition and Source Identify of Different Particle Size in Chongqing Down City

为研究重庆市大气颗粒物的污染特征及其来源,于2010年3—10月在主城区分别采集PM1.0、PM2.5和PM103种粒径的颗粒物样品,利用XRF分析其中的26种元素浓度。结果表明,重庆市主城区S元素在各粒径中含量都较高,细粒子中K的含量较高,粗粒子中Si、Ca和Fe的浓度较大。富集因子分析表明,主城区Cd、S、Se等污染元素的富集系数较大,且粒径越小,富集现象越明显。利用因子分析得出土壤风沙、扬尘、燃煤的燃烧、机动车燃油产生的尾气排放、生物质燃烧排放是重庆市颗粒物污染的主要来源。

To research the characteristics and sources of particles in Chongqing down city, samples of PM1.0, PM25 and PM10 were collected, and 26 elements of the samples were determined by XRF. The results showed that S had the high concentrations in all different diameter particles, K had high concentration in fine particle, and Si, Ca, Fe had high concentration in coarse particle. The Cd, S,Se had enrichment factors, and the factors in the fine particles were higher than in coarse particles. Factor analysis showed that the soil, dust, coal, mobile exhaust gas, biomass burning on the chemical composition were the main sources of particle in Chongqing.