Effect of Secondary HCHO and Ozone Formation during SIJAQ 2021 Campaign - Analysis of HCHO-2,4-DNPH Using LC/QTOF

IF 1 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES Journal of Korean Society for Atmospheric Environment Pub Date : 2022-08-31 DOI:10.5572/kosae.2022.38.4.577
Seoyeong Choe, Sea-Ho Oh, Minsung Kim, Myoung-Ki Song, Geun-Hye Yu, L. Chang, S. Shin, M. Bae
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Abstract

Scientific analyses were carried out to determine the effect of ozone formation based on volatile organic compounds (VOCs) at the central area of Seoul from October 17 to November 11 in 2021 during Satellite Integrated Joint monitoring of Air Quality (SIJAQ 2021) campaign. VOCs including formaldehyde (HCHO) can be emitted by biogenic, primary emission, and secondary formation in urban areas. In this study, HCHO were collected using a 4-hr integrated sequence sampler equipped absorption tubes including 2,4-dinitrophenylhydrazine (DNPH). Liquid Chromatography/Quadruple Time Of Flight (LC/QTOF) was utilized to determine the quantitative analysis of HCHO. As a result, overall average of HCHO is presented as 7.4 ppb, which is about 2.4 times higher than toluene concentrations. Strong diurnal pattern as in day-time maximum indicates that secondary HCHO is dominant. A quarter of measured ozone could be originated from HCHO from ozone formation potential model. The current result can be applied to reduction strategies for ozone and verification of satellite HCHO monitoring.
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2021年SIJAQ活动期间二次六氯环己烷和臭氧形成的影响——使用LC/QTOF对六氯环己烷-2,4-DNPH的分析
在2021年10月17日至11月11日的卫星综合空气质量联合监测(SIJAQ 2021)中,对首尔市中心地区挥发性有机化合物(VOCs)臭氧形成的影响进行了科学分析。在城市地区,包括甲醛(HCHO)在内的挥发性有机化合物可通过生物源性、一次排放和二次形成排放。在本研究中,HCHO的采集采用了配备2,4-二硝基苯肼(DNPH)吸收管的4小时集成序列进样器。采用液相色谱法/四倍飞行时间法(LC/QTOF)对HCHO进行定量分析。因此,HCHO的总体平均值为7.4 ppb,约为甲苯浓度的2.4倍。强烈的日变化模式表明次生HCHO是主要的。根据臭氧形成势模型,测得的臭氧有1 / 4可能来自HCHO。目前的结果可以应用于臭氧的减少战略和卫星HCHO监测的验证。
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来源期刊
Journal of Korean Society for Atmospheric Environment
Journal of Korean Society for Atmospheric Environment METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
2.00
自引率
60.00%
发文量
50
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