汾河平原典型城市秋冬季PM_(2.5)中二次无机离子生成机制与影响因素研究  

Study on the formation mechanism and influencing factors of secondary inorganic ions in PM_(2.5) from typical cities in the Fenhe Plain in autumn and winter

作　　者：周永乾 ZHOU Yongqian(MOE Key Laboratory of Resources and Environmental System Optimization,College of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学环境科学与工程学院,资源环境系统优化教育部重点实验室,北京102206

出　　处：《黑龙江环境通报》2025年第2期21-24,共4页Heilongjiang Environmental Journal

摘　　要：本文对2020年11月至2021年1月汾河平原典型城市(晋中市、太原市和三门峡市)大气PM_(2.5)进行采集并分析。结果表明,观测期间汾河平原典型城市PM_(2.5)平均浓度均超过国家二级标准限值。各城市WSIIs浓度在PM_(2.5)中占比均在37%以上,SNA浓度在WSIIs中占比均在78%以上。三门峡市、晋中市SO_(4)^(2-)和NO_(3)^(-)主要通过非均相氧化反应生成,太原市SO_(4)^(2-)和NO_(3)^(-)的生成受气相和非均相氧化反应的双重影响。各城市颗粒物整体呈碱性。三门峡市大气中NH4+主要以NH4Cl、(NH_(4))_(2)SO_(4)和NH_(4)NO_(3)形式存在,晋中市和太原市NH4+则主要以(NH_(4))_(2)SO_(4)和NH_(4)NO_(3)形式存在。汾河平原典型城市WSIIs组分的主要来源是二次源,其次为燃煤源、移动源、扬尘源和生物质燃烧源。The atmospheric PM_(2.5) samples were from 3 typical cities in the Fenhe Plain(Jinzhong,Taiyuan and Sanmenxia)during November 2020 to January 2021.The analysis results showed that the average concentration of PM_(2.5) in 3 typical cities in Fenhe Plain exceeded level 2 of the National Ambient Air Quality Standards.For each city,the WSIIs concentrations accounted for more than 37%of the PM_(2.5) and the SNA concentrations accounted for more than 78%of the WSIIs.SO_(4)^(2-)and NO_(3)^(-)were mainly formed through heterogeneous oxidation in Sanmenxia and Jinzhong,while the formation of SO_(4)^(2-)and NO_(3)^(-)in Taiyuan was accomplished by both gaseous phase and heterogeneous oxidation.The PM_(2.5) is alkaline in each city.The NH4+in Sanmenxia mainly existed in the form of NH4Cl,(NH_(4))_(2)SO_(4) and NH_(4)NO_(3).However,the NH4+in Jinzhong and Taiyuan mainly existed in the form of(NH_(4))_(2)SO_(4) and NH_(4)NO_(3).The main source of WSIIs in typical cities of Fenhe Plain was secondary source,followed by coal combustion sourc,mobile source and fugitive dust source,and biomass combustion source.

关 键 词：汾河平原城市 细颗粒物 SNA 生成机制 来源解析 

分 类 号：X513[环境科学与工程—环境工程]