摘要
为探究自贡市冬季大气PM_(2.5)污染特征,文章分析了自贡市冬季大气PM_(2.5)中水溶性离子、无机元素和碳质组分的浓度水平及来源。结果表明,二次无机离子(NO_(3)^(-)、SO_(4)^(2-)、NH_(4)^(+))是自贡冬季PM_(2.5)中水溶性离子的重要组成部分,占PM_(2.5)质量浓度的45.8%。SOR和NOR值分别为0.45和0.31,说明自贡市二次离子污染较为严重;PM_(2.5)中无机元素总浓度为2.7μg/m^(3),占PM_(2.5)质量浓度的3.9%。通过富集因子法分析,Pd、Te、Ag、Cd、Sb、Se、Mo、Sn、Hg、Br、Cs、Tl为高度富集;As、Co、Sc、Ga、Pb、Cr、Zn、Cu、Ni为中度富集;Al、K、Mn、V、Ba为轻度富集;TC质量浓度为19.3μg/m^(3),其中OC为11.7μg/m^(3)、EC为7.5μg/m^(3),分别占PM_(2.5)质量浓度的15.3%、9.8%。PM_(2.5)中SOC平均浓度为1.6μg/m^(3),占OC的13.7%;自贡市冬季PM_(2.5)来源贡献大小依次为二次硝酸盐(24.5%)、移动源(20.9%)、二次硫酸盐(18.1%)、工业源(17.2%)、生物质燃烧源(10.1%)、扬尘源(9.2%),应重点管控移动源、水泥行业、道路扬尘和施工扬尘、生物质燃烧等排放源。
In order to explore the characteristics of PM_(2.5) pollution in Zigong city in winter,the concentrations and sources of water-soluble ions,inorganic elements and carbon components in PM_(2.5) in winter were analyzed.The results showed that secondary inorganic ions(NO_(3)^(-),SO_(4)^(2-),and NH_(4)^(+))were important components of water-soluble ions in PM_(2.5) in Zigong in winter,accounting for 45.8% of the mass concentration of PM_(2.5).SOR and NOR were 0.45 and 0.31 respectively,indicating that secondary ion pollution in the City was serious.The total concentration of inorganic elements in PM_(2.5) was 2.7μg/m^(3),accounting for 3.9%of the mass concentration of PM_(2.5).By enrichment factor analysis,Pd,Te,Ag,Cd,Sb,Se,Mo,Sn,Hg,Br,Cs,Tl were highly enriched.As,Co,Sc,Ga,Pb,Cr,Zn,Cu,Ni were moderately enriched.Al,K,Mn,V and Ba were slightly enriched.The mass concentration of TC was 19.3μg/m^(3),of which 11.7μg/m^(3) for OC and 7.5μg/m^(3) for EC accounted for15.3% and 9.8% of the mass concentration of PM_(2.5) respectively.SOC average concentration in PM_(2.5) was 1.6μg/m^(3),accounting for 13.7%of OC.The contribution of PM_(2.5) sources in winter is secondary nitrates(24.5%),mobile sources(20.9%),secondary sulfates(18.1%),industrial sources(17.2%),biomass combustion sources(10.1%)and dust sources(9.2%),and the emission sources such as mobile sources,cement industry,road dust and construction dust,and biomass combustion should be mainly controlled.
作者
钟宗莲
刘忠鹏
何军
何水晶
朱渌波
ZHONG Zonglian;LIU Zhongpeng;HE Jun;HE Shuijing;ZHU Lubo(Zigong Ecological Environment Monitoring Center of Sichuan Province,Zigong 643030,China;Zigong City Water Supply and Drainage Design Institute,Zigong 643000,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2021年第2期85-89,共5页
Environmental Science & Technology
作者简介
钟宗莲(1990-),女,工程师,硕士研究生,主要研究方向为环境监测及大气环境污染治理,(电子信箱)zhong_xxiao188@163.com;通讯作者:刘忠鹏,男,高级工程师,主要研究方向为环境监测及管理,(电子信箱)liznpy@163.com。
