摘要
2017年1月—12月期间在四川省宜宾市布置4个点位,共采集360个PM_(2.5)样品膜,采用美国沙漠研究所DRI Model 2001型热光分析仪测定PM_(2.5)样品中OC、EC的浓度值,应用OC/EC比值法对SOC进行了估算.结果表明,宜宾市PM_(2.5)年均浓度为75.2μg·m^(-3).OC、EC年均浓度分别为14.3μg·m^(-3)和4.30μg·m^(-3),季节变化趋势为冬季>秋季>春季>夏季,OC占PM_(2.5)比例为19.0%,为PM_(2.5)重要组成部分.SOC年均浓度为4.70μg·m^(-3),对OC贡献较大,在OC中占比为29.3%;SOC在OC中的占比春季>冬季≈秋季>夏季.进一步对OC1、OC2、OC3、OC4、EC1、EC2、EC3、和OPC进行主成分分析,结果表明机动车尾气、燃煤排放和生物质燃烧是宜宾市PM_(2.5)中OC和EC的主要贡献源,可贡献PM_(2.5)中碳组分的54.0%—69.0%.
Three hundred and sixty PM2.5 samples were collected in locations in Yibin,Sichuan Province,from January 2017 to December 2017.The concentrations of organic carbon(OC)and element carbon(EC)in PM2.5 samples were determined by DRI Model 2001 Thermo/Optical Carbon Analyzer.The secondary organic carbon(SOC)was then estimated by the OC/EC ratio.The results showed that the annual average concentration of PM2.5 in Yibin was 75.2μg·m-3.The annual average concentrations of OC and EC were 14.3μg·m-3 and 4.30μg·m-3,respectively.Also,the OC and EC concentrations showed a seasonal variation in an order of winter>autumn>spring>summer.OC accounted for 19.0%of PM2.5,which was an important part of PM2.5.Annual average concentration of SOC was 4.70μg·m-3,accounting for 29.3%of total OC.Note that the proportion of SOC in OC followed the order of spring>winter≈autumn>summer.Further principal component analysis(PCA)of OC1,OC2,OC3,OC4,EC1,EC2,EC3 and OPC showed that motor vehicle exhaust,coal-fired emissions and biomass burning were the main sources of OC and EC in PM2.5 in Yibin,contributing 54.0%—69.0%of the carbonaceous aerosol in PM2.5.
作者
尹寒梅
陈军辉
冯小琼
徐雪梅
姜涛
钱骏
叶宏
YIN Hanmei;CHEN Junhui;FENG Xiaoqiong;XU Xuemei;JIANG Tao;QIAN Jun;YE Hong(Sichuan Province Environmental Protection Technology Engineering Co.,Ltd.,Chengdu,610041,China;Sichuan Research Institute of Environmental Protection,Chengdu,610041,China)
出处
《环境化学》
CAS
CSCD
北大核心
2019年第4期738-745,共8页
Environmental Chemistry
