【作者】 于令达； 王广甫； 初钧晗； 朱光华； 张仁健；

【机构】 北京师范大学核科学技术学院射线束技术与材料改性教育部重点实验室； 北京市辐射中心； 中国科学院大气物理研究所东亚区域气候环境重点实验室；

【摘要】 为了系统的反映北京采暖期前与采暖期间大气颗粒物的特征,2008年10月底到12月初在北京北三环内城区使用分级式撞击采样仪进行了大气颗粒物采样并用质子激发X射线荧光分析(PIXE)方法对其中16种化学元素浓度进行了分析。结果表明,采暖期间比采暖期前16种元素总浓度增长3%,As、Cu在采暖期间比采暖期前浓度增幅在30%以上,细粒态Pb浓度增长27%。富集因子分析表明,Cu、As、Pb等有毒元素细粒态富集因子比99年同期有明显减小,说明北京近年实行的环保措施是有效果的。更多还原

【Abstract】 In order to show the characteristics of atmospheric particles before and in heating period in Beijing, samples of atmospheric particles were collected during the period of October ～ December 2008. Concentrations of 16 elements in particles were determined with Proton Induced X-ray Emission (PIXE) technique. The results show that concentrations of 16 elements in heating period increased by 3 percents than that before heating period. Concentrations of As、Cu increased by more than 30 percents, concentration of Pb in fine particles increased by 27 percents. The result of enrichment factors analysis shows that the enrichment factors of Cu,As,Pb decrease largely compared with those in 1999, which indicates that prevention and control of the atmospheric pollution in Beijing are effective.更多还原