摘要
采集北京市11个区县内的大气颗粒物样品,分析了TSP、PM10、PM2.5的含量分布特征,重金属元素Cd在大气颗粒物中的地球化学分布特征及其生态风险,结果表明:北京市3种粒径的大气颗粒物中PM2.5的超标幅度最大,并且PM10中载带的重金属大部分都集中在PM2.5中。除密云、通州地区外,Cd元素在不同粒级大气颗粒物中浓度的高低表现为TSP>PM10>PM2.5;不同功能区相比,公园中大气颗粒物中Cd元素浓度明显高于农田区和教育区,因此公园的环境质量问题应该引起相关部门的关注。研究区内不同粒径大气颗粒物中Cd元素的非致癌风险较小,但与其他地区相比,海淀区的非致癌风险较高,大气颗粒物超标幅度最大,因此应该重视海淀区的环境健康问题。
The samples of atmospheric particulate matter were collected from 11 districts/counties of Beijing,the content distribution characteristics in TSP,PM10 and PM2.5,and geochemical characteristics of Cd in them（TSP,PM10,PM2.5） were analyzed,the ecological risk of Cd in atmospheric particulates was assessed.The results indicated that the mass concentration of PM2.5 exceeded the standard highest among three particle sizes of atmospheric particulates in Beijing.With heavy metals in PM10,most of them are concentrated in PM2.5.Except Miyun and Tongzhou,the concentration level of Cd in three particle sizes of atmospheric particulates is TSPPM10PM2.5.Comparing with different functional areas,the mass concentration of Cd in the park is higher than that in the education area and farmland area,so the environmental quality problems in the park should arouse the relevant departments＇ concern.Although the non-cancer risk of Cd of atmospheric particulates is low,the non-cancer risk in Haidian district is the highest in Beijing.Therefore,more attention should be paid to the environmental health issues in Haidian district.
出处
《现代地质》
CAS
CSCD
北大核心
2012年第5期983-988,共6页
Geoscience
基金
中央高校基本科研业务费专项资金资助项目
中国地质调查局"北京市平原区农田生态系统区域生态地球化学评价"项目(13100)
关键词
大气颗粒物
CD
地球化学特征
生态风险评估
北京市
atmospheric particulate matter
Cd
geochemical characteristics
ecological risk assessment
Beijing
