大学生寝室春季空气中大气颗粒物粒径分布及其影响因素

摘要

采用直读式DustTrak 8533型颗粒物浓度测定仪于2016年3月26日至4月11日对黄石某高校大学生寝室室内颗粒物浓度进行了连续监测。结果显示,室内PM2.5和PM10的浓度范围分别为33~95μg/m3和45~140μg/m3,PM10日均浓度均未超过国家2级标准,其中PM2.5质量浓度有4 d超过国家2级标准(>75μg/m3)；PM2.5的质量浓度在颗粒物浓度中起着主导作用,占总悬浮颗粒物质量浓度的63%；PM2.5/ PM10和PM10/TSP比值在采样期间起伏变化都比较大,其中PM2.5/PM10在3月29日、4月2日比值达到0.8以上,说明细颗粒物污染比较严重；PM10/TSP比值在0.75~0.92之间波动,说明PM10质量浓度对颗粒物质量浓度影响较大；分析采样监测的温度、湿度、风速与颗粒物浓度的相关性可知,颗粒物质量浓度的变化与温度、湿度都存在弱的负相关性。%The indoor particle mass concentration of the college student's dormitory in Huangshi was analyzed by the direct-reading DustTrak 8533 particle concentration detector from March 26 to April 11,2016,and the factors affecting indoor air quality were discussed. The results indicated that the indoor PM2. 5 and PM10 concentration ranges were 33~95 μg/m3 and 45~140 μg/m3 ,PM10 daily average concentration did not ex-ceed the national secondary standard,but four days in which the concentration of PM2. 5 exceed the national secondary standard( >75 μg/m3 ) . PM2. 5 of the mass concentration played a major role in particulate con-centration and occupied 63% of the total suspended particles. The fluctuations of the ratio of PM2. 5/PM10 and PM10/TSP changed greatly during the sample period,the ratio of PM2. 5/PM10 on March 29 and April 2 were above 0. 8,indicating the fine particle pollution was serious;the ratio of PM10/TSP changed between the 0. 75~0. 92,indicating PM10 mass concentration has great influence on TSP concentration. The correlation between particle concentration and temperature,humidity and air velocity acquired by sampling and monitoring analy-sis showed that there was weak negative correlation between the particle concentration change and temperature and humidity.