2018年天津市大气PM2.5中水溶性离子污染特征  

Pollution characteristics of water-soluble ions in atmospheric PM2.5 in Tianjin in 2018

作　　者：段梦茹 吕光[2] 张明月[2] 汤乃军[1,3] DUAN Meng-ru;LU Guang;ZHANG Ming-yue;TANG Nai-jun(School of Public Health, Tianjin Medical University, Tianjin 300070, China)

机构地区：[1]天津医科大学公共卫生学院,天津300070 [2]天津市疾病预防控制中心理化科 [3]天津市环境营养与人群健康重点实验室

出　　处：《环境与健康杂志》2019年第3期236-239,共4页Journal of Environment and Health

摘　　要：目的分析2018年天津市大气PM2.5中水溶性离子的污染特征,为科学制定防控措施提供参考依据。方法于2018年每月10-16日及雾霾日对天津市和平区和宝坻区两个监测点进行大气PM2.5采样,采用离子色谱法检测大气PM2.5中4种水溶性离子(Cl^-、SO4^2-、NO3^-、NH4^+)的质量浓度。结果和平区和宝坻区检测点大气PM2.5中的Cl^-、SO4^2-、NO3^-、NH4^+质量浓度分别为1.32、5.32、8.14、4.11μg/m3和1.05、6.39、10.07、6.36μg/m^3;和平区各组分浓度均以四季度最高,宝坻区各组分浓度多为一季度最高。和平区和宝坻区大气PM2.5中的硫氧化率(SOR)均以三季度最高,两监测点的全年[NO3^-]/[SO4^2-]比值均值分别为1.81和1.77。结论本次监测地区的大气PM2.5中4种水溶性离子污染水平有一定差异,移动源污染已成为大气PM2.5污染的重要来源。Objective To analyze the pollution characteristics of w ater-soluble ions in PM2.5 in T ianjin in 2018 ,and to provide a reference to the scientific prevention and control m easures. Methods On the 10th -16th of each m onth and haze days in 2018, two monitoring points in H eping district and Baodi district of Tianjin were selected for sam p lin g ,an d w ater-soluble ions (CI-, SO42-, NO3- and NH4+) in atm ospheric PM2.5 were determ ined and analyzed by ion chrom atography. Results The annual average concentrations of CI-,S042-, N03- and NH4+ were1.32,5.32,8.14and4.11μg/m3 in Heping district, 1.05,6.39,10.07 and 6.36 p-g/m3 in Baodi d istric t, respectively. The concentration of each component in H eping district was the highest in the fourth quarter,w hile that in Baodi district was the highest in the first quarter. The SOR and NOR of the two monitoring points were the highest in the third quarter,and the average values of [N03-]/[S042-] were 1.81 and 1.77 ,respectively. Conclusion The significant difference is seen in the pollution levels of four w ater-soluble ions betw een the two investigated districts in Tianjin in 2018 ,and the mobile source is considered as an im portant source of PM2.5 pollution in Tianjin.

关 键 词：大气PM2.5 水溶性离子 污染特征 

分 类 号：R122.2[医药卫生—环境卫生学]