采暖期不同阶段大气超细颗粒物污染特征初步研究

Preliminary study on pollution characteristics of ambient ultrafine particles during heating period

目的研究冬季采暖期大气污染典型地区超细颗粒物(UFPs)的污染特征。方法分别于采暖前期(2016年11月14—27日)、采暖中期(2017年1月2—15日)和采暖后期(2017年3月6—19日)以天津市中心某交通路口为监测点监测UFPs污染水平。结果冬季采暖期监测点UFPs日粒数浓度、日表面积浓度和日质量浓度平均水平分别为(11 720±3 062)粒/cm^3、(116.22±29.93)μm^2/cm^3和(1.37±0.37)μg/m^3,最高浓度分别为23 317粒/cm^3、264.25μm^2/cm^3和3.2μg/m^3;相关性分析发现在8:30监测的UFPs粒数浓度与PM_(2.5)质量浓度呈负相关(r=-0.327,P<0.05)。结论该监测点UFPs污染浓度较高,粒数浓度与PM_(2.5)质量浓度存在一定关联。

Objective To investigate the pollution characteristics of ambient ultrafine particles（UFPs） of typical atmospheric pollution areas in China. Methods The daily number concentrations, surface area concentrations and mass concentrations of UFPs in early stage（Dec14-Dec27,2016）, middle stage（Jan2-Jan15, 2017） and late stage（Mar 6-Mar19, 2017） of heating period were monitored on a monitoring site in central area of Tianjin. Results The average number concentration, surface area concentration and mass concentration of UFPs were（11 720 ±3 062）/cm3,（116.22 ±29.93） μm2/cm3 and（1.37 ±0.37）μg/m3 respectively;While the highest number concentration, surface area concentration and mass concentration of UFPs respectively run up to 23 317/cm3, 264.25 μm2/cm3 and 3.2 μg/m3; The mass concentrations of PM2.5 were negatively correlated to the number concentrations of UFPs on 8：30（r=-0.327,P〈0.05）. Conclusion The levels of UFPs is higher. The relationship is seen between mass concentrations of PM2.5 and the number concentrations of UFPs, which will provide reliable experiment data for the study on health effects of UFPs exposure.