Measurements of Sulfur Dioxide and Formaldehyde in Taipei Using a Differential Optical Absorption Spectrometer
Measurements of Sulfur Dioxide and Formaldehyde in Taipei Using a Differential Optical Absorption Spectrometer
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使用差示光学吸收光谱仪测量台北市的二氧化硫和甲醛
DOI：
10.1080/10473289.2001.10464259
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发表时间：
2001
影响因子：
2.7
通讯作者：
J. Lo
中科院分区：
文献类型：
--
作者：
Lizamma Mathew;Wu R. Tai;J. Lo
摘要台北市是台湾的省会城市，位于盆地中，其地形阻碍了污染物在城市中的扩散。作为我们的空气质量研究的延续，从1999年2月到1999年6月，我们使用差分光学吸收光谱仪（DOAS）测量了六个不同位置的二氧化硫浓度和五个位置的甲醛浓度。二氧化硫的平均浓度为3.5至6.6 ppb。头城的平均浓度最高，因为它靠近点源。其中，仙田的浓度与头城相近，新余浓度最低。DOAS和台湾空气质量监测网（TAQMN）的SO2测量结果在头城、板桥和仙田高度相关（r2 > 0.9）。然而，DOAS的SO2浓度是2倍以上的盐田和板桥略低于TAQMN浓度。甲醛的平均浓度从7到10 ppb不等。甲醛的日变化与臭氧的变化密切相关，尤其是当1小时臭氧浓度峰值>60 ppb时。光化学形成的甲醛在台北的环境水平。甲醛浓度在O3浓度高的日子变得显著。我们的研究结果表明，DOAS可以取代传统的测量技术。
ABSTRACT Taipei, the capital city of Taiwan, lies in a basin, and its topography prevents the dispersion of pollutants in the city. As a continuation of our air quality study, from February 1999 through June 1999, we measured the concentrations of SO2 at six different locations and of formaldehyde at five locations using a differential optical absorption spectrometer (DOAS). The average concentration of SO2 varied from 3.5 to 6.6 ppb. The average concentration was highest at Toucheng because of its proximity to point sources. The level in Hsientien was close to that in Toucheng, with Hsinyu showing the lowest concentrations. The DOAS and the Taiwan Air Quality Monitoring Network (TAQMN) measurements for SO2 were highly correlated (r2 > 0.9) for Toucheng, Panchiao, and Hsientien. However, DOAS SO2 concentrations were 2 times higher for Hsientien and slightly lower for Panchiao than the TAQMN concentrations were. The average concentration of formaldehyde varied from 7 to 10 ppb. Diurnal variation of formaldehyde closely followed the variation of ozone, especially when the 1-hr peak ozone concentration was >60 ppb. Photochemical formation accounted for the ambient levels of formaldehyde in Taipei. Concentration of formaldehyde became significant on days when O3 concentration was high. Our results indicate that DOAS can replace conventional measurement techniques.