银川市PM2.5重金属元素的环境污染特征分析

 分析了银川市PM2.5中9种重金属元素在春季风沙期、夏秋季非采暖期、冬季采暖期的浓度分布特征和富集因子。结果表明：银川市PM2.5中重金属元素的质量浓度在风沙期、非采暖期、采暖期表现不同，Cu,Ni,Mn,Cr,Fe,Cd元素在风沙期浓度最高，Zn,Pb,Co在采暖期浓度最高，说明风沙期和采暖期是银川市一年中的强污染期；重金属元素在不同粒径颗粒物中的浓度水平有明显差别，有害的重金属元素主要吸附在PM2.5中，应引起重视；Zn,Cd元素在各时段都有明显富集，主要来自人为源贡献；Pb元素在采暖期明显富集，说明银川市冬季采暖燃煤的排放对空气中污染元素Pb的贡献很大。

Environmental Pollution Characteristics of Heavy Metal Elements of PM2.5 in Yinchuan

For Yinchuan city,the distribution character and the enrichment factor of 9 heavy metal elements of PM_(2.5) are analyzed during 3 periods of the year,i.e,spring sandstorm season,no-house heating season and house heating season.The heavy metal mass concentrations are different in the 3 periods,for details,the Cu,Ni,Mn,Cr,Fe and Cd mass concentration are the highest in spring sandstorm season;the Zn,Pb and Co mass concentration are the highest in the house heating season.It is severely polluted in these two periods of the year.Heavy metal mass concentration sharply changed with particle diameters,it is noticeable that the poisonous heavy metal was absorbed mainly in PM_(2.5);Zn and Cd mainly came from the source of human activity,and enriched obviously;Pb mainly produced and enriched by coal-burning in the house-heating season.It is obviously that coal-burning made a big contribution for Pb pollution in the atmosphere.