采暖期北京市不同粒径颗粒物16种元素的分布特征研究

发布时间：2018-02-19 22:23

本文关键词： 大气颗粒物采暖期元素北京　出处：《环境与健康杂志》2016年12期 　论文类型：期刊论文

【摘要】：目的了解采暖期北京市不同粒径颗粒物上16种元素的浓度水平、聚集程度和分布特征。方法于2015年采暖期在北京市使用PSW-8型气溶胶粒度分布采样器和石英滤膜采集大气颗粒物样品,采用重量法测定不同粒径大气颗粒物的浓度,采用微波消解-ICP/MS法测定不同粒径颗粒物中16种元素的浓度。结果不同粒径大气颗粒物浓度及负载的元素浓度均不同,粒径小于2.1μm的颗粒物浓度及其上负载的元素浓度较高。不同元素在不同粒径颗粒物中的富集程度不一致,Pb、Mn和Cu 3种元素在不同粒径单位质量颗粒物中的含量均较高。大气颗粒物中Se、Pb、Cs、Ag、As、Rb、Cd和Bi 8种元素也主要集中在粒径小于2.1μm的颗粒物上,占该元素总浓度的比例均大于60%,而Co、U、V和Sr 4种元素主要集中在粒径大于2.1μm的颗粒物中。结论采暖期北京市大气颗粒物浓度及负载元素浓度较高,不同粒径颗粒物上元素的浓度水平、聚集程度和分布特征有所差异,有必要进一步关注较小粒径颗粒物的人群健康影响研究。
[Abstract]:Objective to investigate the concentrations of 16 elements in different particle sizes in Beijing during heating period. Methods during the heating period of 2015, PSW-8 aerosol particle size distribution sampler and quartz filter membrane were used to collect atmospheric particulate matter samples, and gravimetric method was used to determine the concentration of different particle sizes in Beijing. The concentrations of 16 elements in different particle sizes were determined by microwave digestion-ICP / MS method. The concentration of particles with particle size less than 2.1 渭 m and the concentration of elements loaded on them were higher. The enrichment degree of different elements in particles with different particle sizes was not consistent. The contents of three elements, PbPb-Mn and Cu, were higher than those in particles with different particle sizes per unit mass. In atmospheric particulate matter, the eight elements of Seo PbPb, CsPbCsCsAg-Ag-AsB, Rb, CD and Bi are also mainly concentrated in particles with particle size less than 2.1 渭 m, and the concentration of the eight elements in the atmospheric particulate matter is less than 2.1 渭 m. The proportion of the total concentration of the elements is greater than 60, while the four elements of Cochon UV and Sr are mainly concentrated in the particles whose diameter is larger than 2.1 渭 m. Conclusion the concentration of atmospheric particles and load elements in Beijing is higher during heating period. The concentration, aggregation and distribution of elements on particles with different particle sizes are different, so it is necessary to pay more attention to the population health effects of smaller particles.
【作者单位】：中国疾病预防控制中心环境与健康相关产品安全所;
【基金】：国家卫生计生委卫生公益性行业科研专项(201402022)
【分类号】：X513

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