环杭州湾区域秋冬季PM_(2.5)中有机碳和元素碳污染特征及来源  

Characteristics and sources of organic carbon and elemental carbon in PM_(2.5) in autumn and winter of Hangzhou Bay area

作　　者：朱俊 王琼真 丁皓 李涵 于馥玮 季政权 蒋琦清 李文娟 吴建 ZHU Jun;WANG Qiongzhen;DING Hao;LI Han;YU Fuwei;JI Zhengquan;JIANG Qiqing;LI Wenjun;WU Jian(Eco-Environmental Science Research&Design Institute of Zhejiang Province,Hangzhou Zhejiang,310007)

机构地区：[1]浙江省生态环境科学设计研究院,浙江杭州310007

出　　处：《环境污染与防治》2021年第7期864-870,共7页Environmental Pollution & Control

基　　金：国家重点研发计划项目(No.2018YFC0213806)。

摘　　要：为了探究环杭州湾区域PM_(2.5)碳组分的污染特征及来源,于2019年10月16日至12月27日在杭州、宁波、湖州、嘉兴、绍兴、舟山6个城市同步采集PM_(2.5)样品,测定有机碳(OC)和元素碳(EC)浓度。结果表明,PM_(2.5)中OC和EC表现为绍兴(11.5、2.3μg/m^(3))与杭州(10.0、2.4μg/m^(3))>宁波(8.4、1.9μg/m^(3))与湖州(8.0、2.1μg/m^(3))>嘉兴(7.2、1.7μg/m^(3))>舟山(4.0、0.8μg/m^(3))。OC/PM_(2.5)(质量分数)和EC/PM_(2.5)(质量分数)分别为14.6%~21.0%和3.2%~4.6%,区域内以绍兴和宁波最高。基于OC/EC最小比值法的二次有机碳(SOC)估算结果显示,SOC/OC(质量分数)为23.5%~35.1%,嘉兴最高、湖州最低。各点位8个碳组分总体以EC1占比最高,OC1、EC2、EC3占比最低。碳组分的主成分分析表明,各点位碳质颗粒物的主要来源均为机动车尾气、燃煤和生物质燃烧,舟山的柴油车尾气和生物质燃烧贡献率之和为29.61%,杭州的柴油车尾气贡献率(12.94%)明显低于湖州、绍兴、嘉兴、宁波(16.84%~18.77%)。To explore the characteristics and sources of carbon components in PM_(2.5) in Hangzhou Bay area,PM_(2.5)samples were collected simultaneously in Hangzhou,Ningbo,Huzhou,Jiaxing,Shaoxing and Zhoushan from October 16 to December 27,2019,and the concentrations of organic carbon(OC)and elemental carbon(EC)were determined.The results showed that OC and EC in PM_(2.5) in descending order were Shaoxing(11.5,2.3μg/m^(3))and Hangzhou(10.0,2.4μg/m^(3))>Ningbo(8.4,1.9μg/m^(3))and Huzhou(8.0,2.1μg/m^(3))>Jiaxing(7.2,1.7μg/m^(3))>Zhoushan(4.0,0.8μg/m^(3)).OC/PM_(2.5)(mass fraction)and EC/PM_(2.5)(mass fraction)were from 14.6%to 21.0%and from^(3).2%to 4.6%for all the six sites,respectively,with both of the highest ratios found in Shaoxing and Ningbo.Estimated by OC/EC minimum ratio method,secondary organic carbon(SOC)/OC(mass fraction)was 23.5%to 35.1%,with the highest ratio found in Jiaxing and the lowest ratio found in Huzhou.The contribution of EC1 in the sum of eight carbon components was highest in all the six cities,while contributions of OC1,EC2,EC3 were lowest.The result of principal components analysis of eight carbon components showed that motor vehicle exhaust,coal combustion and biomass burning were the major sources of carbonaceous particles in all the six sites,and diesel vehicle exhaust and biomass burning accounted for 29.61%of carbonaceous particles in Zhoushan,while the contribution of diesel vehicle exhaust to carbonaceous particles(12.94%)in Hangzhou was lower than that in Huzhou,Shaoxing,Jiaxing and Ningbo(16.84%-18.77%).

关 键 词：PM_(2.5) 有机碳 元素碳 来源 

分 类 号：X513[环境科学与工程—环境工程]