丰台区PM_(2.5)中二次水溶性无机盐离子浓度分析

Analysis of Secondary Water-soluble Inorganic Salt IONS Concentration in PM_(2.5)in Fengtai District

在2019年3月至2020年2月间,每月的10-16日和雾霾天气利用采集器将空气中的PM_(2.5)富集在石英纤维滤膜上,送地方机构进行检测.研究北京市丰台区大气污染中二次水溶性离子(SNA)SO^(2-)_(4)、NO^(-)_(3)和NH^(+)_(4)浓度的变化,为丰台区大气污染的研究和治理提供数据支撑.结果表明SO^(2-)_(4)、NO^(-)_(3)和NH^(+)_(4)三种离子在2019年3月至2020年2月之间各月份浓度有显著差异,且均在2月份产生峰值.但只有NO^(-)_(3)的浓度在不同季节间差异明显(P<0.05).由NO^(-)_(3)/SO^(2-)_(4)的春秋冬季比值均>1,夏季比值<1.可见,SO^(2-)_(4)、NO^(-)_(3)和NH^(+)_(4)浓度各月份之间的差异具有统计学意义,但只有NO^(-)_(3)在不同季节间浓度变化明显.丰台区春秋冬季以流动源污染为主,夏季流动源污染不明显.

From march 2019 to february 2020,the air was collected using air-collector in 10th to 16th of each month together with haze weather and the quartz fiber filter membranes were sent to the local organization for testing.Through analyzing the concentration changes of secondary water-soluble ions(SO^(2-)_(4),NO^(-)_(3),NH^(+)_(4))in air pollution in Fengtai District to provide data support for the research and air pollution control.The concentrations of SO^(2-)_(4),NO^(-)_(3),and NH^(+)_(4)varied significantly from march 2019to february 2020,and all peaked in February.Only the concentration of NO^(-)_(3)varied significantly in different seasons(P<0.05).The spring and winter ratios of(NO^(-)_(3)/SO^(2-)_(4))were>1and the summer ratio of(NO^(-)_(3)/SO^(2-)_(4))was<1.The differences of concentrations of SO^(2-)_(4),NO^(-)_(3)and NH^(+)_(4)were statistically significant,but only the concentrations of NO^(-)_(3)varied significantly in seasons.It was mobile source pollution in spring,autumn and winter and the mobile source pollution was not obvious in summer in Fengtai District.