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黄山景观区域氮、硫湿沉降来源与地球化学过程

Sources and geochemical processes of nitrogen and sulfur wet deposition in mount Huangshan landscape
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摘要 黄山是世界著名的地质公园,近年来该地区酸雨频率增加,威胁着景区的地质生态环境.本研究通过长期降水化学观测与氮、氧、硫同位素地球化学分析,探讨黄山景区氮、硫湿沉降来源与地球化学过程,以期揭示酸雨成因.结果表明,研究期间酸雨频率为62.5%. SO4^2-和NO-3为主要致酸离子.[SO4^2-]/[NO-3]当量比均值为1.7,主要受早期氮排放和移动源递增贡献影响.氮、氧、硫同位素组成和分异数据表明,降水中SO4^2-和NO-3主要来源为移动源(燃油)释放,工业源(燃煤)贡献次之,降水硝酸、硫酸的形成主要为燃油燃烧及其氧化物氧化过程. Ca2+和NH+4为酸雨的主要中和因子.我国逐渐增加的移动源化石燃料排放已经对黄山景区大气环境产生显著影响. Mount Huangshan is a famous geological park in the world. Recently the acid rain has arisen with increased frequency in this area, threatening the geological and ecological environment. To reveal the cause of acid rain, the geochemical processes and sources of nitrate and sulfate wet deposition were discussed, based on precipitation chemistry characteristics together with the geochemical analysis of nitrogen, oxygen and sulfur isotopes. Results show that the acid rain frequency is 62.5% during the study period, wherein SO■ and NO-3 are the major acidic anions. The average equivalent ratio of [SO■]/[ NO-3] is 1.7, suggesting the acidity of rainwater is greatly affected by NOx emissions and the increasing in vehicles. The data analyses of nitrogen, oxygen and sulfur isotopic composition and their fractionation indicate that SO■ and NO-3 are mainly derived from mobile sources(burning oil), followed by industrial sources(burning coal). The fuel combustion and oxidation process of oxide are the main contributor in the appearance of nitric and sulfuric acid precipitation. Ca2+ and NH+4 are dominant neutralization factors for the acidity of rainwater. In summary, the increased fossil fuel emission from mobile sources has a significant impact on the atmospheric environment of Mount Huangshan Scenic Area.
作者 江用彬 黄燕军 金相雷 汪晓云 董俐香 张海英 黄学文 季宏兵 李维 缪鹏 JIANG Yongbin;HUANG Yanjun;JIN Xianglei;WANG Xiaoyun;DONG Lixiang;ZHANG Haiying;HUANG Xuewen;JI Hongbing;LI Wei;MIAO Peng(Department of Environment and Engineering,Anhui University of Technology,Ma'anshan,243002,China;Engineering Research Center of Biomembrane Water Purification and Utilization Technology,Ma'anshan,243002,China;State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,550081,China;Huangshan Scenic Area Administration Committee,Huangshan,242700,China)
出处 《环境化学》 CAS CSCD 北大核心 2019年第11期2610-2618,共9页 Environmental Chemistry
基金 安徽省自然科学基金(1608085MD82) 国家自然科学基金(41203055)资助~~
关键词 黄山 酸雨 氮同位素 氧同位素 硫同位素 Mount Huangshan acid rain nitrogen isotope oxygen isotope sulfur isotope
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