Urban atmospheric formaldehyde concentrations measured by a differential optical absorption spectroscopy method
Urban atmospheric formaldehyde concentrations measured by a differential optical absorption spectroscopy method
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微分光吸收光谱法测定城市大气甲醛浓度
DOI：
10.1039/c3em00545c
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发表时间：
2014-02-01
影响因子：
5.5
通讯作者：
Zhou, Bin
中科院分区：
文献类型：
--
作者：
Li, Xiang;Wang, Shangshang;Zhou, Bin
采用差分吸收光谱法对上海市环境空气中甲醛浓度进行了监测。测量在2010年4月至2011年4月期间进行，共获得120 940个记录数据点。甲醛的平均浓度在2010年8月最高（10.0 ppbv），在2010年4月最低（2.0 ppbv）。HCHO和O-3的日变化在所有季节都遵循非常相似的趋势。这从HCHO与O-3具有很强的正相关性这一事实中显而易见。两者都在早上（当地时间07：00-09：00）和晚上（当地时间16：00-19：00）达到峰值。浓度峰值因季节而异，这可能归因于人类活动、交通流动和大气边界层条件的季节性变化。2011年冬季的背景HCHO浓度（类似于12.0 ppbv）比2010年春季观察到的浓度（类似于2.0 ppbv）高一个数量级;与上海市政府在2010年世博会期间（2010年5月1日至2010年10月31日）之前和之后采取的几项污染控制措施的结果相对应。本研究为了解大城市大气中HCHO的浓度水平和化学过程提供了基础资料。
In this study a differential optical absorption spectroscopy (DOAS) method was used to monitor formaldehyde (HCHO) concentrations in Shanghai ambient air at a research station in Fudan University. The measurements were carried out during April 2010 April 2011 and a total of 120 940 recorded data points were obtained. The average HCHO concentration was found to be the highest (10.0 ppbv) during August 2010 and the lowest (2.0 ppbv) during April 2010. The diurnal variation of HCHO and O-3 followed very similar trends in all the seasons. This was evident from the fact that HCHO had a strong positive correlation with O-3. Both peaked once in the morning (07:00-09:00 local time), and once in the night (16:00-19:00 local time). The peak concentrations varied from season to season, which could be attributed to the seasonal variation in anthropogenic activity, traffic movement and atmospheric boundary layer conditions. The background HCHO concentration in 2011 winter (similar to 12.0 ppbv) was an order of magnitude higher than that observed in 2010 spring (similar to 2.0 ppbv); corresponding with the results of several pollution controls adopted by the Shanghai administrative government before and after the EXPO 2010 period (May 1, 2010 Oct. 31 2010). This study contributed the basic information for understanding the concentration level and the chemical processes of atmospheric HCHO in a major metropolitan area.