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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 689  全文点击 127  投稿时间:2021-10-07  修订日期:2021-11-14
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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
作者单位E-mail
关璐 南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室, 南京 210044 785519855@qq.com 
丁铖 南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室, 南京 210044  
张毓秀 南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室, 南京 210044  
胡建林 南京信息工程大学环境科学与工程学院, 江苏省大气环境监测与污染控制高技术研究重点实验室, 南京 210044  
于兴娜 南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室, 南京 210044 xnyu@nuist.edu.cn 
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.

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