| 宁波市不同粒径颗粒物中无机离子污染特征研究 |
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| 引用本文： | 蔡秋亮,李建荣,佟磊,钟宁,易辉,肖航.宁波市不同粒径颗粒物中无机离子污染特征研究[J].地球化学,2020(3):306-314. |
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| 作者姓名： | 蔡秋亮 李建荣 佟磊 钟宁 易辉 肖航 |
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| 作者单位： | 中国科学院城市环境研究所区域大气环境研究卓越创新中心城市环境与健康重点实验室;中国科学院大学;中国科学院宁波城市环境观测研究站;闽南师范大学 |
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| 基金项目： | 海峡西岸城市群灰霾生成、消散与防控机制(U1405235)。 |
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| 摘 要： | 细颗粒物(PM2.5)对气候、空气质量和人体健康具有显著影响,水溶性无机离子是PM2.5主要成分。在2018-01-24至2018-02-20期间,宁波地区经历了一系列低温和PM2.5浓度较高的天气过程,利用在线离子色谱(MARGA)和颗粒物化学组分监测仪(ACSM)监测宁波气溶胶的无机离子,研究了PM2.5和亚微米细颗粒物(PM1.0)中硫酸根(SO4^2?)、硝酸根(NO3^?)和铵根(NH4^+)(三者统称为SNA)的变化特征。结果表明,SNA的质量浓度均与PM2.5有明显正相关;随PM2.5质量浓度的增加,SO4^2?当量浓度(摩尔浓度×所带电荷数)百分比呈现减少趋势,而NO3^?百分比呈现增加趋势;NH4^+百分比未呈现明显变化趋势;NH4^+主要分布在1.0μm以下粒径的颗粒物中,SO4^2?主要分布在1.0~2.5μm的粒径的颗粒物中;PM2.5中NH4+当量浓度百分比低于PM1.0。0~1.0μm粒径段的颗粒物中NH4^+可以完全中和SO4^2?和NO3^?,形成硫酸铵和硝酸铵,还可形成其他形态的铵盐;1.0~2.5μm粒径段的颗粒物中NH4^+不能完全中和SO4^2?及NO3^?,NH4^+当量浓度低于SO42?和NO3?两者当量浓度之和,SNA主要以硝酸铵和硫酸铵形式存在,还存在其他形态的硝酸盐或硫酸盐。本次工作通过对PM2.5和PM1.0中SNA存在形式及其在不同粒径中主导成分的研究,为宁波市大气污染特征的了解提供科学依据。
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| 关 键 词： | 在线离子色谱 在线颗粒物化学组分监测仪 PM2.5 PM1.0 无机离子 宁波 |
Study on the characteristics of inorganic ions in different particle sizes in Ningbo |
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| CAI Qiu-liang,LI Jian-rong,TONG Lei,ZHONG Ning,YI Hui,XIAO Hang.Study on the characteristics of inorganic ions in different particle sizes in Ningbo[J].Geochimica,2020(3):306-314. |
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| Authors: | CAI Qiu-liang LI Jian-rong TONG Lei ZHONG Ning YI Hui XIAO Hang |
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| Institution: | (Key Laboratory of Urban Environment and Health,Center for Excellence in Regional Atmospheric Environment,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China;University of Chinese Academy of Sciences,Beijing 100049,China;Ningbo Urban Environment Observation and Research Station-NUEORS,Chinese Academy of Sciences,Ningbo 315830,China;Minnan Normal University,Zhangzhou 363000,China) |
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| Abstract: | PM2.5 has a significant impact on climate,air quality and human health.Between January 24 and February 20,2018,Ningbo experienced a series of haze episodes.Monitor for Aerosols and Gases(MARGA)and Aerosol Chemical Speciation Monitor(ACSM)were used to measure the concentrations of sulfate,nitrate,and ammonium(SNA)in Ningbo.We studied the characteristics of sulfate,nitrate,and ammonium in different particle sizes,PM1.0 and PM2.5.Results indicated that the SNA concentration positively correlated to the mass concentration of PM2.5.The percentage of equivalent concentration(molar concentration×number of charges)of sulfate decreased,while that of nitrate increased and that of ammonium remained unchanged with the mass concentration of PM2.5.The percentage of equivalent concentration of ammonium in PM2.5 was lower than that observed in PM1.0.The particle size of ammonium was mostly distributed in PM1.0,while sulfate was mostly distributed in the 1.0-2.5μm range.NH4+in the particulate matter with a particle size range of 0-1.0μm completely neutralized SO4^2?,NO3^?,and SNA form of ammonium nitrate and ammonium sulfate as well as other ammonium salts with anions.NH4+in the particulate matter with a particle size range 1.0-2.5μm particle size failed to completely neutralize SO4^2?and NO3^?and the equivalent concentration of NH4+was less than that of the sum of SO4^2?and NO3^?.SNA mainly existed as ammonium nitrate,ammonium sulfate and as other nitrate or sulfate salts with cations.In this report,the existing forms of SNA and its dominant components in PM1.0 and PM2.5 were clarified,which provided the scientific basis for understanding the characteristics of air pollution in Ningbo. |
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| Keywords: | monitor for aerosols and gases aerosol chemical speciation monitor PM2 5 PM1 0 inorganic ions Ningbo |
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