摘要
2014年1~12月,使用URG在线及滤膜采集-实验室分析两种方法对北京市大气细颗粒物PM_(2.5)中的水溶性离子进行检测,并对春、夏、秋、冬这4种不同季节下两种测量方法的差异性进行了比对研究.全年测量结果显示,在线URG所获离子总量高于滤膜采集所获离子总量,其中两种方法所测Cl^-、NO_3^-、Mg^(2+)、Ca^(2+)年均浓度差异不大,而在线所测SO_4^(2-)、NH_4^+、Na^+、K^+结果均明显高于滤膜测试结果.4种主要的水溶性离子中SO_4^(2-)、NO_3^-和Cl^-的相关性较好,NH_4^+相关性略差;不同季节两种测量方法所获结果也略有不同,NO_3^-、SO_4^(2-)、Cl-在秋、冬季差异不显著,而NH_4^+仅在冬季拟合性较好.
Concentrations of water-soluble ions were measured in Beijing during 2014 for comparison of URG online monitoring systems and filter-based manual methods. The differences of four main ions components in spring,summer,autumn and winter were compared.The total concentrations of eight ions measured by URG online were higher than those of filter-based manual method. There was no significant differences among the annual concentrations of Cl-,NO3-,Mg2＋ and Ca2＋ obtained by the two methods,while the concentrations of SO42-,NH4＋,Na＋,K＋ from online were higher than those from filter. NO3-,SO42-,Cl-had good correlations in autumn and winter,and NH4＋ only had better fitting performance in winter.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2016年第10期3730-3736,共7页
Environmental Science
关键词
PM2.5
水溶性离子
在线
手工采样
比对
PM.5
water-soluble ions
on-line monitoring
manual sampling
comparison
