摘要
对PM 2.5水溶性离子特征及关系进行了分析,旨在更好地发挥植被的生态效益,提高空气质量。以北京南海子公园和西山国家森林公园为观测点,运用双通道颗粒物在线监测设备实时监测PM 2.5质量浓度,使用离子色谱仪测定PM 2.5样品中水溶性离子质量浓度,分析两个观测点PM 2.5质量浓度及水溶性离子特征。南海子公园和西山国家森林公园年均PM 2.5质量浓度分别为90.64、81.45 mg·L^-1,两个观测点环境空气PM 2.5质量浓度均呈冬季最高,春秋次之,夏季最低。PM 2.5水溶性离子中的主要组成成分为SO^2-4、NO^-3、Na^+,其质量浓度四季变化主要受PM 2.5质量浓度影响;二次离子(SO^2-4、NO^-3、NH^+4)季节变化和PM 2.5变化一致,除NO-2外,Na^+、Cl-、NO^-3、Mg^2+、Ca^2+质量浓度季节差异明显。四季内不同梯度下PM 2.5及其水溶性离子质量浓度在空间上都呈现一定的分布规律:南海子公园高于西山国家森林公园。PM 2.5受SO^2-4、Na^+、NO^-3、NH^+4影响较大,基本呈正相关关系,SO^2-4、NO^-3、Na^+、NH^+4的相关性极显著(P=0.88、P=0.83、P=0.90),NO^-3和Na^+、NH^+4之间关系也较显著(P=0.86、P=0.67),Ca^2+、Mg^2+相关性极明显(P=0.96),其他水溶性离子间无明显的相关性。
The characteristics and relationship of PM 2.5 water-soluble ions were analyzed in order to better exert the ecological benefits of vegetation and improve air quality.Taking Beijing Nanhaizi Park and Xishan National Forest Park as observation points,the dual-channel particulate matter online monitoring equipment was used to monitor the PM 2.5 mass concentration in real time,and the ion chromatograph was used to determine the mass concentration of water-soluble ions in the PM 2.5 sample,and the two observation points PM 2.5 were analyzed mass concentration and water-soluble ion characteristics.The average annual PM 2.5 mass concentration of Nanhaizi Park and Xishan National Forest Park is 90.64 and 81.45 mg·L^-1,respectively.The ambient air PM 2.5 mass concentration of the two observation points is highest in winter,followed by spring and autumn,and lowest in summer.The main components of PM 2.5 water-soluble ions are SO^2-4,NO-3,Na^+,and its mass concentration seasonal change is mainly affected by the PM 2.5 mass concentration;the secondary ions(SO^2-4,NO-3,NH^+4)seasonal change and PM 2.5.The change is consistent,except for NO-2,the seasonal differences in Na^+,Cl-,NO-3,Mg^2+,Ca^2+mass concentration are obvious.The spatial distribution of PM 2.5 and its water-soluble ion mass concentration under different gradients in the four seasons showed a certain spatial distribution:Nanhaizi Park was higher than Xishan National Forest Park.PM 2.5 is greatly affected by SO^2-4,Na^+,NO-3,NH^+4,and has a positive correlation.The correlation of SO^2-4,NO-3,Na^+,NH^+4 is extremely significant(P=0.88,P=0.83,P=0.90).The relationship between NO-3,Na^+and NH^+4 is also large(P=0.86,P=0.67),the correlation between Ca^2+and Mg^2+is very obvious(P=0.96),and there is no obvious correlation between other water-soluble ions.
作者
鲁绍伟
温佳美
李少宁
赵娜
蒋燕
张勇
Lu Shaowei;Wen Jiamei;Li Shaoning;Zhao Na;Jiang Yan;Zhang Yong(Beijing Forestry Fruit Science Research Institute,Beijing 100093,P.R.China;Shenyang Agricultural University;Southwest Forestry University;Nanhaizi Country Park Management Office,Daxing District,Beijing)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2020年第10期61-66,共6页
Journal of Northeast Forestry University
基金
北京市农林科学院科技创新能力建设资助项目(KJCX20180202、KJCX20160301、KJCX 20170601)
科技创新团队资助项目(TWKST 201609)
科技创新服务能力建设-科研基地建设-林果业生态环境功能提升协同创新中心(2011协同创新中心)(市级)项目(PXM2017_014207_000024)
关键词
不同污染程度
PM
2.5
水溶性离子
变化特征
Different pollution degrees
PM 2.5
Water-soluble ions
Change characteristics
