| 北京中关村地区气溶胶的酸性测量 |
| 摘要点击 1238 全文点击 1520 投稿时间：1997-09-04 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 气溶胶 硫酸盐 氨 北京中关村地区 |
| 英文关键词 aerosol sulfate ammonia Zhongguancun District |
|
| 中文摘要 |
| 为了研究大气气溶胶的酸性及其粒径分布,笔者利用自制环状扩散管和三级撞击式组合采样器采样,pH测量和傅利叶红外光谱技术测量相结合,于1994年冬季至1995年冬季在北京中关村地区进行了采样分析。结果表明,北京中关村地区气溶胶存在酸性组成,且酸性主要分布于粒径1.5μm以下的细粒子中,测得的细粒子最大酸度(以H+计)为56.6nmol·m-3,各季节中1994年冬季和1995年夏季气溶胶酸性较强,日平均一般在5nmol·m-3以上。FTIR法直接测量了气溶胶中的HSO4-,并表明HSO4-是气溶胶中的主要致酸因素之一,细粒子中HSO4-约占SO42-的6%左右。多元回归结果表明气溶胶酸性与细粒子中的SO42-和NH4+有良好的相关性. |
| 英文摘要 |
| In order to study the aerosol acidity and its diameter dispersion,between the two winters of 1994 and 1995,samples in Zhongguancun district of Beijing were collected with annular denuder and three-stage impact sampling system,and analyzed by means of measurement of pH and Fourier-Transform-Infrared(FTIR) technique.It was showed that in this district,there exists in aerosol the acid composition with its distribution mainly in the fine particles and that the strongest acidity is 56.6nmol(H+)·m-3 with the relatively strong aerosol acidity in the winter of 1994 and the summer of 1995.The daily average of aerosol strong acidity is usually over 5nmol(H+)·m-3.HSO4- was directly detected and measured with FTIR technique.It was found that HSO4- is one of the main reasons for the acidity of aerosol,and that HSO4- is about 6% of SO42-.The result of regression indicated there is the obvious interrelation among the aerosol acidity,SO42- and NH4+ in the fine particles. |
|
|
|
