摘要
利用在线气体及气溶胶成分监测系统(MARGA)对南宁市2018年春节期间(2月8—22日)大气PM 1及其水溶性离子进行监测,对比分析春节前后PM 1及其水溶性离子的污染特征。结果表明,监测期间大气PM 1和PM 2.5质量浓度平均值分别为40.40、63.50μg/m 3,PM 1是PM 2.5中的主要成分,二次离子(NO3、SO4^2、NH4^+)是水溶性离子的主要组分,烟花爆竹燃放对PM 2.5的影响略高于PM 1;南宁市大气PM 1存在较为明显的二次转化,烟花爆竹集中燃放污染时段硫氧化率较高,非烟花爆竹集中燃放污染时段氮氧化率较高,SO2通过均相、非均相氧化反应转化为SO4^2-,而NOx主要通过与O 3的光化学反应转化为NO3。禁、限放区域的划定可显著降低南宁市春节期间PM 1浓度,对控制PM 1污染有重要意义。
The concentration of PM 1 and its water-soluble ions was serially monitored by using on-line Monitor for Aerosols and Gases in Ambient Air(MARGA)system during the Spring Festival in Nanning City(February 8 to 22,2018).The pollution characteristic of PM 1 and its water-soluble ions before and after the Spring Festival was compared and analyzed.The results showed that the average mass concentrations of PM 1 and PM 2.5 during the monitoring period were 40.40 and 63.50μg/m 3,respectively.PM 1 was the main component of PM 2.5,and secondary ions(NO3,SO 4^2-,NH4^+)were the main components of water-soluble ions.The impact of fireworks and firecrackers on PM 2.5 was slightly higher than that of PM 1.Atmospheric PM 1 in Nanning City had a relatively obvious secondary transformation.The sulfur oxidation rate was highest during the fireworks and firecrackers concentrated discharge period,and the nitrogen oxidation rate was the highest during the common pollution period with no concentrated discharge of fireworks and firecrackers.SO 2 converted to SO4^2-through homogeneous and heterogeneous oxidation reactions,while NO x mainly converted to NO3 through photochemical reactions with O 3.The delimitation of no-fireworks and firecrackers area could significantly reduce the PM 1 concentration during the Spring Festival in Nanning,which was of great significance for the control of PM 1 pollution.
作者
安学文
黄炯丽
莫招育
刘慧琳
黄华存
陈志明
李宏姣
梁桂云
杨俊超
张达标
穆奕君
黄喜寿
李昊
AN Xuewen;HUANG Jiongli;MO Zhaoyu;LIU Huilin;HUANG Huacun;CHEN Zhiming;LI Hongjiao;LIANG Guiyun;YANG Junchao;ZHANG Dabiao;MU Yijun;HUANG Xishou;LI Hao(College of Resources,Environment and Materials,Guangxi University,Nanning Guangxi 530042;Scientific Research Academy of Guangxi Environmental Protection,Nanning Guangxi 530022;Department of Environmental Science and Engineering,Fudan University,Shanghai 200433)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2021年第1期84-90,共7页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.21777026)
广西重点研发计划项目(桂科AB20238014)
广西自然科学基金资助项目(No.2019GXNSFBA185039、2019GXNSFAA185061)
广西大气污染源解析及预报预警工程技术中心资助项目。
