杭州市PM_(2.5)中水溶性离子的污染特征研究  

Pollution characteristics of water-soluble ions in PM_(2.5) of Hangzhou

作　　者：陈金媛[1] 唐凯杰 朱莹[2] 刘柏辰[1] 

机构地区：[1]浙江工业大学环境学院,浙江杭州310014 [2]中国计量大学质量与安全工程学院,浙江杭州310018

出　　处：《浙江工业大学学报》2016年第4期410-416,共7页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金资助项目(21177114);浙江省自然科学基金资助项目(LZ15B070001)

摘　　要：为全面了解杭州市PM_(2.5)中水溶性离子的污染特征及其来源,于2014年10月—2015年9月在杭州市2个采样点采集了PM_(2.5)样品,运用离子色谱法对PM_(2.5)中的水溶性离子进行了分析.结果表明:PM_(2.5)中9种水溶性离子的年均质量浓度为46.63μg/m^3,占PM_(2.5)质量浓度的54.97%.主要离子Cl^-,NO_3^-,SO4^(2-),NH_4^+质量浓度季节变化明显,表现为冬季>秋季>春季>夏季.SOR值和NOR值说明杭州市大气中二次颗粒明显存在,并且SO_2的二次转化率大于NO_2的二次转化率.因子分析表明:二次气溶胶、道路扬尘、建筑扬尘和工业排放是采样期间杭州市PM_(2.5)的主要来源.To investigate the pollution characteristics and sources of water-soluble ions of PM_(2.5),PM_(2.5)samples were collected at two sites in Hangzhou from October 2014 to September 2015.The water-soluble ions were detected using ion chromatography.The results showed that the annual average mass concentration of 9water-soluble ions was 46.63μg/m^3,which accounted for54.97% of PM_(2.5).The dominant ions,including Cl^-,NO_3^-,SO4^(2-) and NH_4^+,exhibited a significant seasonal variation in mass concentrations,with the order of winter > autumn >spring > summer.The values of SOR and NOR indicated that the secondary particles existed obviously in the atmosphere of Hangzhou and the ratio of the second conversion of SO_2 was larger than that of NO_2.The factor analysis indicated that secondary aerosol,road dust,building dust and industrial emission were the main sources of PM_(2.5)in Hangzhou during the sampling period.

关 键 词：水溶性离子 PM2.5 季节变化 因子分析 

分 类 号：X131.1[环境科学与工程—环境科学]