摘要
为研究冬季城市大气细颗粒物(PM_(2.5))在不同湿度段的污染特征,选取相对湿度(RH)较高的成都市为研究区域,于2014年冬季划分RH<60%,60%<RH<80%和RH>80%3个湿度段进行大气PM_(2.5)采样。结果表明:采样期间PM_(2.5)日均浓度范围为106.96~233.89μg/m3,超标率100%。PM_(2.5)浓度和RH相关系数r=0.473。PM_(2.5)质量浓度、总离子浓度及二次离子浓度在RH>80%分别是RH<60%时的1.48倍、1.74倍和1.89倍,与成都市高湿静稳天气造成污染累积有关。主成分分析发现RH>80%时PM_(2.5)的主要来源是燃煤燃油源,而RH<60%时,主要为机动车尾气和扬尘源等。
In order to study the pollution characteristics of fine particulate matter（ PM_（2.5）） in different humidity segments during winter,Chengdu City,with high relative humidity（ RH）,was selected as the study area and the PM_（2.5） samples were collected in winter,2014. The division of RH60 %,60 %RH80 % and RH80 % represented three humidity segments for sampling. The results showed that the mass concentrations of PM_（2.5） were 106.96-233.89 μg/m3 and the standard exceeding ratio was 100% in sampling period. The correlation coefficient of concentration of PM_（2.5） with humidity was 0.473.The concentration of PM_（2.5）,total ions and the second inorganic ions during RH80 % was 1.48,1.74 and 1.89 times as much as that in RH60 %,which was relative with the static stability and higher moisture resulting pollution accumulation.The results of principal component analysis that showed the main sources of PM_（2.5） were coal and oil combustion emissions when RH80 %,whereas dust and motor vehicles emission were the main sources when RH60 %.
出处
《成都信息工程大学学报》
2017年第6期662-666,共5页
Journal of Chengdu University of Information Technology
基金
四川省教育厅基金资助项目(重点)(13Z197)
国家自然科学基金资助项目(21407014)
四川省科技支撑计划基金资助项目(2015GZ0240)
关键词
环境科学
环境监测
细颗粒物
污染特征
湿度
水溶性离子
environmental science
environmental monitoring
fine particulate matter
pollution characteristic
humidity
water-soluble ion
