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DOI	10.1016/j.atmosenv.2021.118787
	PM2.5 pH estimation in Seoul during the KORUS-AQ campaign using different thermodynamic models
	Kim Y.; Park O.; Park S.H.; Kim M.; Kim J.-J.; Choi J.-Y.; Lee D.; Cho S.; Shim S.
发表日期	2022
ISSN	1352-2310
卷号	268
英文摘要	Despite its profound influence on air quality, the aerosol acidity, quantifiable by aerosol pH is poorly characterized in South Korea where high concentrations of fine particles have become a serious environmental issue. In this study, we estimated the pH values of PM2.5 using observations of inorganic species and precursor gases concentrations, ambient temperature and relative humidity (RH), measured at the Olympic Park in Seoul during the KORUS-AQ campaign (10 May to June 19, 2016). For the aerosol pH calculation, the ISORROPIA and E-AIM thermodynamic equilibrium models in forward mode were used, in which we found the phase state assumption, either stable (solid + liquid) or metastable (liquid only) had no significant impact on pH predictions. As reported previously, the unrealistic pH prediction of ∼7.6 by ISORROPIA, which largely misrepresents ammonia-rich aerosol contents in the Seoul atmosphere was mainly due to coding errors in the standard ISORROPIA model (i.e., forward mode with stable state assumption). Using the revised ISORROPIA, pH predictions obtained with stable assumption approached those obtained with the metastable state assumption. Following such amendment, fine particle samples were predicted to be acidic with pH values ranging from 1.5 to 4.0 as determined by both ISORROPIA and E-AIM calculations. These pH values were higher than those reported in the United States and Europe and lower than those reported in northern China. A comparison of ISORROPIA and E-AIM models revealed that the pH values obtained using ISORROPIA were consistently but only ∼0.4 pH unit higher than those obtained using E-AIM, demonstrating the precision and consistent utility of thermodynamic equilibrium model in the quantification of PM2.5 pH in Seoul. © 2021 Elsevier Ltd
关键词	Gas-particle partitioning of semivolatile inorganic species KORUS-AQ pH estimation PM2.5 Thermodynamic equilibrium models
语种	英语
scopus关键词	Air quality; Ammonia; Forecasting; pH; Gas-particle partitioning of semivolatile inorganic species; Gas/particle partitioning; Inorganic species; KORUS-AQ; Ph estimation; pH value; PM 2.5; Pm2.5; Semivolatiles; Thermodynamic equilibrium modeling; Aerosols; ammonia; calcium ion; chloride ion; hydrochloric acid; inorganic compound; magnesium ion; nitrate; nitric acid; proton; sodium ion; sulfate; sulfuric acid; air quality; air temperature; ambient air; ammonia; concentration (composition); estimation method; particulate matter; precision; relative humidity; thermodynamics; acid dissociation constant; acidity; aerosol; air pollution; air quality; Article; calculation; concentration (parameter); controlled study; environmental temperature; equilibrium constant; gas analysis; intermethod comparison; mathematical model; measurement precision; particulate matter 2.5; pH measurement; phase partitioning; physical phase; pollution monitoring; prediction; relative humidity; South Korea; thermodynamics; China; Europe; South Korea; United States
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248165
作者单位	Department of Environmental Engineering, Sunchon National University, Suncheon, Jeonnam 57922, South Korea; Department of Chemistry, Sunchon National University, Suncheon, Jeonnam 57922, South Korea; Department of Environmental Engineering and Energy, Myongji University, Yongin, Gyunggi 17058, South Korea; Department of Environmental Atmospheric Sciences, Pukyong National University, Pusan, 48513, South Korea; Air Quality Forecasting Center, Climate and Air Quality Research Department, National Institute of Environmental Research, Incheon, 22689, South Korea; Seoul Research Institute of Public Health and Environment, Gwacheon, Gyeonggi 13818, South Korea
推荐引用方式 GB/T 7714	Kim Y.,Park O.,Park S.H.,et al. PM2.5 pH estimation in Seoul during the KORUS-AQ campaign using different thermodynamic models[J],2022,268.
APA	Kim Y..,Park O..,Park S.H..,Kim M..,Kim J.-J..,...&Shim S..(2022).PM2.5 pH estimation in Seoul during the KORUS-AQ campaign using different thermodynamic models.ATMOSPHERIC ENVIRONMENT,268.
MLA	Kim Y.,et al."PM2.5 pH estimation in Seoul during the KORUS-AQ campaign using different thermodynamic models".ATMOSPHERIC ENVIRONMENT 268(2022).