張家界森林大氣中醛酮類化合物濃度變化特征
[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.
【作者單位】: 長沙理工大學(xué)化學(xué)與生物工程學(xué)院;張家界武陵源婦聯(lián);
【基金】:國家自然科學(xué)基金項目(21307008) 湖南省科技廳計劃項目(2014FJ3158) 長沙市科技局計劃項目(K1403048-31)
【分類號】:X51
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