| 南京江北新区PM2.5中水溶性有机氮的污染特征及其来源 |
| 摘要点击 1731 全文点击 596 投稿时间：2021-10-07 修订日期：2021-11-14 |
| 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 PM2.5 水溶性有机氮 季节变化 污染特征 来源 |
| 英文关键词 PM2.5 water-soluble organic nitrogen seasonal variation pollution characteristics source |
|
| 中文摘要 |
| 以南京江北新区2019年4、7、11和12月为代表分析了大气PM2.5中水溶性有机氮（WSON）的季节变化特征，探讨了WSON与水溶性无机氮（WSIN）的关系.结果表明，南京江北新区PM2.5中WSON的变化范围为0.446~4.200 μg·m-3，平均值为2.04 μg·m-3，略高于北京、上海和常州的观测结果.秋季PM2.5中的WSON平均值最高［（2.967±0.643）μg·m-3］，约为其他3个季节的1.7倍.南京细粒子中WSON对水溶性总氮（WSTN）的平均贡献率占到25%，并表现出夏秋高、冬春低的特点，如冬季该占比仅为夏秋季的50%左右.WSON与WSIN中的NO2--N相关性最高，与NO3--N的相关性最低，可能与夏季高温导致NO3--N的挥发有关.通过主成分分析（PCA）表明，南京江北新区细粒子中WSON主要来源于二次转化、海盐、扬尘和生物质燃烧. |
| 英文摘要 |
| The seasonal variation characteristics of water-soluble organic nitrogen (WSON) in PM2.5 were analyzed in the Nanjing Jiangbei new area. The relationship between WSON and water-soluble inorganic nitrogen (WSIN) was also discussed. The results showed that the variation range of WSON in PM2.5 was 0.446 to 4.200 μg·m-3, with an average value of 2.04 μg·m-3. This value was slightly higher than the observed results in Beijing, Shanghai, and Changzhou. The average value of WSON was the highest in autumn[(2.967±0.643) μg·m-3], which was approximately 1.7 times that of the other three seasons. The average contribution ratio of WSON to water-soluble total nitrogen (WSTN) in fine particles of Nanjing accounted for 25%, with high ratios in summer-autumn and low ratios in winter-spring. For example, the proportion of WSON/WSTN in winter was only approximately 50% of that in summer and autumn. WSON had the highest correlation with NO2--N and the lowest correlation with NO3--N in WSIN, which may be related to the volatilization of NO3--N caused by high temperatures in summer. Principal component analysis (PCA) showed that WSON of PM2.5 in Nanjing was mainly derived from secondary transformation, sea salt, dust, and biomass combustion. |
