| 杭州城区春节PM2.5中水溶性离子在线观测 |
| Online Measurement of the Water-Soluble Ions in PM2.5 during Spring Festival in Hangzhou |
| 投稿时间：2012-06-01 修订日期：2012-07-24 |
| DOI： |
| 中文关键词: 杭州 PM2.5 水溶性离子 烟花爆竹 日变化 相关性 |
| 英文关键词:Hangzhou PM2.5 water-soluble ions fireworks diurnal variation correlation |
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| 中文摘要: |
| 利用大气细颗粒物水溶性组分在线连续监测分析系统（AIM-URG9000D），考察了杭州城区春节期间PM2.5中无机水溶性离子的浓度变化范围，探讨了这些离子的日变化特征和影响因素，同时分析了集中燃放烟花爆竹对水溶性离子浓度的影响。结果表明，SO42-、NO3-、NH4+是PM2.5中水溶性离子的主要成分，分别占全部水溶性组分的33.3%、28.4%、19.4%；强致癌物质NO2-浓度为2.07 μg/m3，远大于膜采样结果；NO3-与SO42-的质量比为0.85，表明机动车尾气排放导致的大气污染正逐步加重；各水溶性离子有着各自不同的日变化规律。相关性分析表明，NH4+与NO3-、SO42-的相关系数分别为0.92、0.81；K+、Cl-、Mg2+3者之间的相关系数均在0.9以上。烟花爆竹燃放期间，PM2.5浓度急剧上升，Cl-、SO42-、K+、Mg2+浓度分别达到燃放前的18、6、53、76倍。 |
| 英文摘要: |
| To understand the mass concentrations and diurnal variation of water-soluble ions in PM2.5and the effect of concentrated discharge of fireworks on the water-soluble ions concentration, an online measurement (ambient ions monitor) of water soluble ions in PM2.5 in Hangzhou was conducted during the Spring Festival 2012. SO42-, NO3- and NH4+ were the dominant water-soluble fractions with the proportions of 33.3%, 28.4% and 19.4%, respectively. The concentration of the strong carcinogenic substance NO2- was 2.07 μg/m3, which far more exceeded the membrane sample results. The mass ratio of NO3-/SO42- was 0.85, indicating that air pollution caused by motor vehicle exhaust emissions were gradually increasing. Various water-soluble ions had different diurnal variation rules. Correlation analysis indicated that correlation coefficients of NH4+ with NO3-, SO42- were 0.92,0.81, respectively and the correlation coefficients between K+, Cl-, Mg2+ all exceed 0.9. During fireworks discharge period the concentration of PM2.5 increased sharply and the concentration of Cl-,SO42-,K+,Mg2+ were 18,6,53,76 times respectively before discharge. |
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