张家界森林大气中醛酮类化合物浓度变化特征

发布时间：2019-04-11 17:03

【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0.51μg/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.
[Abstract]:In order to investigate the changes of aldehydes and ketones in the atmosphere of subtropical forest, the concentration of aldehydes and ketones in the atmosphere of Zhangjiajie forest was monitored by EPA TO-11A method in Zhangjiajie Forest Park from August 2014 to January 2015. The results showed that the main aldehydes and ketones in the atmosphere of Zhangjiajie forest were formaldehyde, acetaldehyde, acetone, propionaldehyde and MACR (methacrolein). The mass concentrations were 4.32, 0.95, 3.01, 0.48 and 0.51 渭 g / m 3, respectively. The seasonal variation characteristics of 蟻 (formaldehyde), 蟻 (acetaldehyde) and 蟻 (MACR) in the atmosphere are obvious. The mass concentrations of aldehydes and ketones are higher in summer and autumn, and lower in winter. In addition, the diurnal variation of aldehydes and ketones was significant. Except for October and December, the maximum concentration of aldehydes and ketones usually appeared in the month of 13: 00 to 15: 00, except that in October and December, the concentration of aldehydes and ketones was greatly influenced by human factors. The C1/C2 (蟻 (formaldehyde) / 蟻 (acetaldehyde) in the atmosphere of Zhangjiajie forest is 5.72, which is higher than that in urban area (C1/C2 = 1), but lower than that in remote forest area (C1/C2 = 10), 蟻 (formaldehyde) and 蟻 (acetaldehyde), 蟻 (MACR) showed positive correlation and reached significant level, but 蟻 (acetone) was not correlated with 蟻 (formaldehyde), 蟻 (acetaldehyde) and 蟻 (MACR). The concentrations of aldehydes and ketones in Zhangjiajie forest were higher than those in Ontario, Mexico and other regions reported in the literature, but significantly lower than those in Beijing, Shanghai and other urban areas. The results show that formaldehyde, acetaldehyde and MACR in the atmosphere of Zhangjiajie forest are mainly derived from the photooxidation of VOCs emitted by plants in forest areas. Besides photooxidative decomposition of organic compounds emitted from plants, acetone also has other anthropogenic sources. The results show that the concentration of aldehydes and ketones in the atmosphere of Zhangjiajie forest is mainly affected by photochemical reaction and other natural factors, but the influence of man-made factors should not be ignored.
【作者单位】：长沙理工大学化学与生物工程学院;张家界武陵源妇联;
【基金】：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)
【分类号】：X51

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