武汉市大气PM 2.5水溶性无机离子的空间污染特点  

Spatial distribution and temporal trend of main water-soluble inorganic ions in PM 2.5 of Wuhan

作　　者：韩清[1] 徐立[1] 胡迅[1] 黄庆竹 汪耀[1] 毛翔[1] HAN Qing;XU Li;HU Xun;HUANG Qingzhu;WANG Yao;MAO Xiang(Wuhan Centres for Disease Control and Prevention,Wuhan 430015,China)

机构地区：[1]武汉市疾病预防控制中心,武汉430015

出　　处：《公共卫生与预防医学》2020年第1期66-69,共4页Journal of Public Health and Preventive Medicine

基　　金：武汉市卫生计生委青年项目(WG18Q12)。

摘　　要：目的研究武汉市大气PM 2.5中主要水溶性离子的污染水平以及污染特征。方法项目在2017年(每个月连续7 d)对武汉市5个监测点进行PM 2.5采样,通过称量法和离子色谱法,可以测得PM 2.5和主要水溶性离子(如NH 4+)的质量浓度,并对季节性变化和空间分布差异进行分析。结果季节不同,武汉市PM 2.5的质量浓度也有变化。冬季PM 2.5质量浓度最高,春秋次之,夏季最低。离子质量浓度和占比的季节差异性比较大。4种水溶性无机离子质量浓度均是冬季最高,且质量浓度和占比最高的是SO4^2-,NH 4^+和NO^3-相当,Cl^-最低。空间分布上,武昌区总离子质量浓度以及占比最大,东西湖区总离子质量浓度以及占比最低。结论武汉市大气中PM 2.5主要水溶性无机离子季节差异性比较明显,空间分布也存在差异性。Objective To investigate spatial distribution and temporal trend of main water-soluble inorganic ions in PM 2.5 of Wuhan.Methods PM 2.5 samples were simultaneously collected at 5 sites in Wuhan from January 2017 to December 2017(7 consecutive days per month).The main water-soluble ions in PM 2.5 were determined by weighing method and ion chromatography.The seasonal variations and spatial distribution differences were analyzed.Results The results showed that the mass concentration of PM 2.5 in Wuhan changed in different seasons.It was highest in winter,followed by spring and autumn,and lowest in summer.There were obvious seasonal changes in the mass concentrations and proportions of distinct ions.The concentrations of the four detected water-soluble inorganic ions were highest in winter.SO4^2-had highest concentration and proportion,followed by NO^3-and NH4^+,and Cl^-was the lowest.In terms of spatial distribution,the total ion concentration and proportion was the largest in Wuchang and the lowest in Dongxihu.Conclusion The seasonal variation of main water-soluble inorganic ions in PM 2.5 was obvious,and the spatial distribution was also different in Wuhan.

关 键 词：PM 2.5 武汉 水溶性无机离子 污染特征 

分 类 号：R122.2[医药卫生—环境卫生学]