成都市中心城区大气PM_1的污染特征及来源解析  

Pollution level and source apportionment of atmospheric particles PM_1 in downtown area of Chengdu

作　　者：林瑜[1,2] 叶芝祥 杨怀金[1,2] 张菊 朱羽蒙[3] LIN Yu;YE Zhi-xiang;YANG Huai-jin;ZHANG Ju;ZHU Yu-meng(College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China;Air Environmental Modeling and Pollution Controlling Key Laboratory of Sichuan Higher Education Institutes, Chengdu 610225, China;Sichuan academy of environmental sciences, Chengdu 610041, China)

机构地区：[1]成都信息工程大学资源环境学院,四川成都610225 [2]大气环境模拟与污染控制四川省高校重点实验室,四川成都610225 [3]四川省环境保护科学研究院,四川成都610041

出　　处：《中国环境科学》2017年第9期3220-3226,共7页China Environmental Science

基　　金：成都信息工程大学(KFKT2015006)

摘　　要：为了解成都市中心城区大气中PM_1污染特征,分别于2015年各季节典型月对中心城区大气PM_1进行膜样品采集,并分析其中的化学组分.结果表明,2015年中心城区PM_1的年均质量浓度为51.97μg/m^3.水溶性离子总量(TWSI)占总PM_1质量浓度的44.56%,是PM_1的主要成分.NO_3^-/SO_4^(2-)年均值为0.66(<1),表明中心城区固定源污染大于移动源的污染.PM_1的硫氧化率(SOR)(0.34)远远大于氮氧化率(NOR)(0.07),说明成都市硫的转化比氮的转化要快很多.有机碳(OC)/元素碳(EC)的相关性分析显示夏季相关性最弱(R^2=0.66),其他各季相关性较好(R^2=0.89),说明夏季OC、EC来源差异较大,其他各季来源相同.源解析结果显示PM_1主要来源有6类:二次硝酸盐、二次硫酸盐、机动车尾气及生物质燃烧源、燃煤尘、扬尘源以及冶金.Membrane samples of atmospheric PM1were collected and their chemical components were analyzed duringtypical months of each season in2015at Chengdu downtown area,to investigate the pollution characteristic caused byatmospheric PM1.Results showed that average mass concentration of the atmospheric PM1at Chengdu downtown areaduring2015was51.97μg/m3.Main backbone of the atmospheric PM1was appeared as water soluble total ion(TWSI),which accounting for44.56%of the total atmospheric PM1.An average NO3-/SO42-of0.66(<1)indicating a greatercontribution of stationary sources in atmospheric PM1pollution than that of mobile sources.A much faster conversion ofsulfur than nitrogen was proved by the higher SOR of0.34(than NOR of0.07).The weaker correlation of organic carbon(OC)/elemental carbon(EC)in summer(R2=0.66)than other seasons(R2=0.89),indicated that the sources of OC and ECin summer was widely,while in other seasons were fixed.Source analysis results showed that there were six kinds of mainsource of the atmospheric PM1at Chengdu downtown area in2015,which were secondary nitrates,secondary sulfates,vehicle exhaust and biomass combustion,coal dust,dust source,and metallurgy.

关 键 词：成都 PM1 有机碳和元素碳 水溶性无机离子 无机元素 来源解析 

分 类 号：X831[环境科学与工程—环境工程] X513