Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-11125-2018 |
Technical note: Comparison and interconversion of pH based on different standard states for aerosol acidity characterization | |
Jia, Shiguo1,2; Wang, Xuemei3; Zhang, Qi1; Sarkar, Sayantan4,5; Wu, Luolin1; Huang, Minjuan1,2; Zhang, Jinpu6; Yang, Liming7 | |
2018-08-09 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:15页码:11125-11133 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; India; Singapore |
英文摘要 | Aerosol pH is often calculated based on different standard states thus making it inappropriate to compare aerosol acidity parameters derived thereby. However, such comparisons are routinely performed in the atmospheric science community. This study attempts to address this issue by comparing PM2.5 aerosol pH based on different scales (molarity, molality and mole fraction) on the basis of theoretical considerations followed with a set of field data from Guangzhou, China as an example. The three most widely used thermodynamic models (E-AIM-IV, ISORROPIA-II, and AIOMFAC) are employed for the comparison. Established theory dictates that the difference between pH(x) (mole fraction based) and pH(m) (molality based) is always a constant (1.74, when the solvent is water) within a thermodynamic model regardless of aerosol property. In contrast, pH(m) and pH(c) (molarity based) are almost identical with a minor effect from temperature and pressure. However, when the activity coefficient is simplified as unity by thermodynamic models, the difference between pH(m) and pH(c) ranges from 0.11 to 0.25 pH units, depending on the chemical composition and the density of hygroscopic aerosol. Therefore, while evaluating aerosol acidity (especially, trend analysis) when the activity coefficient is simplified as 1, considering the pH scale is important. The application of this pH standardization protocol might influence some conclusions on aerosol acidity reported by past studies, and thus a clear definition of pH and a precise statement of thermodynamic model parameters are recommended to avoid bias when pH comparisons are made across studies. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000441168600003 |
WOS关键词 | FINE-PARTICLE PH ; CHEMICAL-COMPOSITION ; THERMODYNAMIC MODEL ; INORGANIC AEROSOL ; BOUNDARY-LAYER ; TEMPERATURE ; PM2.5 ; WATER ; CONVERSION ; EXCHANGE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17319 |
专题 | 地球科学 |
作者单位 | 1.Sun Yat Sen Univ, Sch Atmospher Sci, Guangzhou 510275, Guangdong, Peoples R China; 2.Sun Yat Sen Univ, Guangdong Prov Key Lab Climate Change & Nat Disas, Guangzhou 510275, Guangdong, Peoples R China; 3.Jinan Univ, Inst Environm & Climate Res, Guangzhou 510632, Guangdong, Peoples R China; 4.Indian Inst Sci Educ & Res Kolkata, Dept Earth Sci, Nadia 741246, W Bengal, India; 5.Indian Inst Sci Educ & Res Kolkata, Ctr Climate & Environm Studies, Nadia 741246, W Bengal, India; 6.Guangzhou Environm Monitoring Ctr, Guangzhou 510030, Guangdong, Peoples R China; 7.Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 117576, Singapore |
推荐引用方式 GB/T 7714 | Jia, Shiguo,Wang, Xuemei,Zhang, Qi,et al. Technical note: Comparison and interconversion of pH based on different standard states for aerosol acidity characterization[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(15):11125-11133. |
APA | Jia, Shiguo.,Wang, Xuemei.,Zhang, Qi.,Sarkar, Sayantan.,Wu, Luolin.,...&Yang, Liming.(2018).Technical note: Comparison and interconversion of pH based on different standard states for aerosol acidity characterization.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(15),11125-11133. |
MLA | Jia, Shiguo,et al."Technical note: Comparison and interconversion of pH based on different standard states for aerosol acidity characterization".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.15(2018):11125-11133. |
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