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太原市气溶胶中硫、氮转化特征
Characteristics of sulfur and nitrogen conversion in the aerosol,Taiyuan

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郭文帝 1   王开扬 1   郭晓方 1   闫雨龙 1   何秋生 1 *   王新明 2  
文摘 基于太原市2013年5、6、12月和2014年1月大气中SO_2、NO_2及PM_(2.5)中水溶性离子SO-4~(2-)、NO_3~-浓度,分析了大气中硫和氮的转化率(F_s、F_n),并探讨了其影响因素.结果表明,大气中SO_2、NO_2的浓度夏季(5、6月)分别为89.98、64.73 μg ? m~(-3),由于燃煤供热冬季(12、1月)SO_2显著升高,SO_2和NO_2分别为119.09、63.92 μg?m~(-3).PM_(2.5)中水溶性离子SO_4~(2-)、NO_3~-夏季分别为16.54、6.87 μg.m~(-3),冬季显著降低,分别为12.79、5.53 μg?m~(-3).参照硫和氮气固两相转化模型,F_s夏季(0.13)高于冬季(0.07),F_n变化较小,夏、冬季分别为0.08、0.06,与南方城市相比,F_s较髙,F_n较低.硫、氮转化受多种因素共同影响,且不同季节主导因素不同.温度和O_3浓度对整个采样期间的硫转化起主要作用,冬季SO_4~(2-)与PM_(2.5)和湿度呈现一定的相关关系,显示SO_4~(2-)主要来源于均相气相反应,冬季部分源于非均相反应.夏季相对湿度和O_3浓度可明显促进氮转化,而冬季NO_3~-生成还与PM2.5和温度有关,说明夏季氮转化以均相液相反应为主,而冬季NO_3~-主要源于非均相反应.此外,NH_4~+与SO_2_4~(2-)、NO_3~-的线性分析表明,大气氨有助于气相中的硫、氮向颗粒相转移并转化.
其他语种文摘 The conversion ratios of sulfur and nitrogen (Fs and Fn) from air to particle in Taiyuan were discussed, based on the atmospheric SO_2 and NO_2 and the water soluble ions (SO_4~(2-) and NO_3~-) in PM_(2.5) during two period of May-June 2013 (summer) and December 2013-January 2014 (winter).As the results showed, the SO_2 and NO_2 contents in summer were 89.98 μg ? m~(-3) and 64.73 μg?m ~(-3), respectively, while in winter NO_2 level was constant, but SO_2 increased to 119.09 μg?m~(-3) due to higher coal combustion for heating. The SO_4~(2-)and NO_3~- levels in PM_(2.5) were 16.54 and 6.87 μg?m~(-3) in summer, and decreased to 12.79 μg?m ~(-3) and 5.53 μg?m~(-3) in winter, respectively. By using the modified forms of the gas-particle distribution, F_s and F_n were 0.13 and 0.08 in summer, and 0.07 and 0.06 in winter, respectively. Both F_s and F_n were affected by multiple factors simultaneously,and the main factors varied seasonally. Higher temperature and ozone (O_3) level contributed primarily to higher sulfur conversion, showing that SO_4~(2-) mainly came from the homogeneous gas-phase reaction. However SO_4~(2-) partially came from heterogeneous reactions in the winter because of a correlation between SO_4~(2-), PM~(2.5) and relative humidity (RH,%). F_n increased with relative humidity and O_3 level in the summer, but in the winter NO_3~- was partially affected by temperature and PM_(2.5) level. These indicated the homogeneous liquid-phase reaction played an important role in the process of nitrogen conversion in summer, but the heterogeneous reaction dominated in winter. Furthermore,NH_4~+ in PM_(2.5) was well correlated with SO_4~(2-) and NO_3~-,which indicated atmospheric NH_3 may enhance the gas to particle sulfur and nitrogen migration and conversion.
来源 环境化学 ,2016,35(1):11-17 【核心库】
DOI 10.7524/j.issn.0254-6108.2016.01.2015060305
关键词 太原 ; 硫酸盐 ; 硝酸盐 ; 气象因素 ; 转化率 ; 气溶胶
地址

1. 太原科技大学环境与安全学院, 太原, 030024  

2. 中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广州, 510640

语种 中文
文献类型 研究性论文
ISSN 0254-6108
学科 环境污染及其防治
基金 国家自然科学基金 ;  国家教育部重点项目 ;  山西省青年科技基金 ;  山西省回国留学人员科研项目
文献收藏号 CSCD:5630543

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引证文献 6

1 赵庆炎 郑州市夏、秋季大气颗粒物中水溶性无机离子质量浓度及粒径分布特征 环境科学,2018,39(11):4866-4875
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2 陈楚 濮阳市秋冬季大气细颗粒物污染特征及来源解析 环境科学,2019,40(8):3421-3430
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