大气中PM_(2.5)水溶性离子在线观测与滤膜采集-实验室检测的比对分析  

Comparison Analysis between Online Monitoring and Filter-based Laboratory Analysis for Water-soluble Ions in PM_(2.5) in the Atmosphere

作　　者：李昌龙 李克诚 LI Chang-long;U Ke-cheng(Xuzhou Ejwironment Monitoring Center Station in Jiangsu,Xuzhou,Jiangsu 221002,China;Qilu University of Technology,School of Materials Science&Engineering,Ji9nan 250353,China)

机构地区：[1]江苏省徐州市环境监测中心站,江苏徐州221002 [2]齐鲁工业大学材料科学与工程学院,河南250353

出　　处：《四川环境》2022年第5期90-96,共7页Sichuan Environment

基　　金：江苏省PM_(2.5)与臭氧协同控制重大专项(2019023)。

摘　　要：通过MARGA在线监测系统及滤膜采集-实验室分析方法进行比对,评估了两种方法对PM_(2.5)中水溶性组分SO_(4)^(2-)、NO_(3)^(-)和NH_(4)^(+)的测定结果。结果显示:(1)两种方法所测得的SO_(4)^(2-)、NO_(3)^(-)和NH_(4)^(+)浓度相关性较好;SO_(4)^(2-)浓度差值较小;MARGA在线所测NO_(3)^(-)和NH_(4)^(+)浓度较滤膜采集-实验室分析偏高9.5%和17.2%,特别是夏季偏差较大。(2)当PM_(2.5)质量浓度>75μg/m^(3)时,两种方法所测得SO_(4)^(2)、NO_(3)^(-)和NH_(4)^(+)浓度偏差不大;当PM_(2.5)质量浓度≤35μg/m^(3)时,偏差较大,应予以重视。为减少颗粒物手工采集过程NH_(4)NO_(3)的损失,需要对单一的滤膜采集方式进行优化。By comparing the MARGA online monitoring system with the filter collection and laboratory analysis method,the results of the two methods for the determination of water-soluble components SO_(4)^(2-),NO_(3)^(-)and NH_(4)^(+)in PM_(2.5)were evaluated.The results showed that(1)The concentrations of SO_(4)^(2-),NO_(3)^(-)and NH_(4)^(+)measured by the two methods had good correlation.The concentration difference of SO_(4)^(2-)was small.Compared with the membrane collection method,the mean concentrations of NO_(3)^(-)and NH_(4)^(+)measured by MARGA were 9.5%and 17.2%higher,especially in summer.(2)When the mass concentration of PM_(2.5)was less than 35μg/m^(3),the deviation of SO_(4)^(2),NO_(3)^(-)and NH_(4)^(+)were larger,which should be paid more attention.When the mass concentration of PM_(2.5)was greater than 75μg/m^(3),the deviation was small.In order to reduce the loss of NH_(4)NO_(3)in the process of manual collection of particulate matter,it is necessary to optimize the single filter membrane collection mode.

关 键 词：PM_(2.5) 水溶性离子 MARGA 手工采样 

分 类 号：X703[环境科学与工程—环境工程]