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张家界森林大气中醛酮类化合物浓度变化特征

蒋朝晖 王玉娇 郑玄 刘湘珍 夏畅斌 肖炘圻 黎莎

蒋朝晖, 王玉娇, 郑玄, 刘湘珍, 夏畅斌, 肖炘圻, 黎莎. 张家界森林大气中醛酮类化合物浓度变化特征[J]. 环境科学研究, 2016, 29(9): 1272-1278.
引用本文: 蒋朝晖, 王玉娇, 郑玄, 刘湘珍, 夏畅斌, 肖炘圻, 黎莎. 张家界森林大气中醛酮类化合物浓度变化特征[J]. 环境科学研究, 2016, 29(9): 1272-1278.
JIANG Zhaohui, WANG Yujiao, ZHENG Xuan, LIU Xiangzhen, XIA Changbin, XIAO Xinqi, LI Sha. Variation Characteristics of Atmospheric Carbonyl Compounds in Zhangjiajie Forest[J]. Research of Environmental Sciences, 2016, 29(9): 1272-1278.
Citation: JIANG Zhaohui, WANG Yujiao, ZHENG Xuan, LIU Xiangzhen, XIA Changbin, XIAO Xinqi, LI Sha. Variation Characteristics of Atmospheric Carbonyl Compounds in Zhangjiajie Forest[J]. Research of Environmental Sciences, 2016, 29(9): 1272-1278.

张家界森林大气中醛酮类化合物浓度变化特征

基金项目: 国家自然科学基金项目(21307008);湖南省科技厅计划项目(2014FJ3158);长沙市科技局计划项目(K1403048-31)

Variation Characteristics of Atmospheric Carbonyl Compounds in Zhangjiajie Forest

  • 摘要: 为探究中亚热带森林大气中醛酮类化合物浓度变化特征,于2014年8月—2015年1月在张家界森林公园采用 EPA TO-11A方法对张家界森林大气中醛酮类化合物质量浓度进行了监测.结果表明:张家界森林大气中主要的醛酮类化合物为甲醛、乙醛、丙酮、丙醛和MACR(甲基丙烯醛),质量浓度分别为4.32、0.95、3.01、0.48和0.51 μg/m3.大气中ρ(甲醛)、 ρ(乙醛)和ρ(MACR)的季节变化特征很明显,夏季和秋季醛酮类化合物质量浓度较高,冬季醛酮类化合物质量浓度较低.此外,醛酮类化合物质量浓度日变化显著,除了10月、12月受人为因素影响较大外,其余月份醛酮质量浓度最大值通常出现在13:00—15:00.张家界森林大气中C1/C2(ρ(甲醛)/ρ(乙醛))为5.72,比城市地区(C1/C2为1左右)高,但比偏远森林地区(C1/C2为10左右)低.ρ(甲醛)与ρ(乙醛)、 ρ(MACR)均呈正相关且达到显著水平,而ρ(丙酮)与ρ(甲醛)、 ρ(乙醛)与ρ(MACR)的相关性差.与文献报道的加拿大Ontario、墨西哥Langmuir等地区对比,张家界森林大气中醛酮类化合物质量浓度较高,但明显低于北京、上海等城市地区.研究显示,张家界森林大气中甲醛、乙醛和MACR主要来自森林地区植物排放的VOCs光氧化生成,丙酮除了来自植物排放的有机物光氧化分解外,还有其他人为源,进一步说明了张家界森林大气中醛酮类化合物浓度变化主要受光化学反应等自然影响,但人为因素的影响也不容忽略.

     

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  • 收稿日期:  2016-03-06
  • 刊出日期:  2016-09-25

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