Articles | Volume 18, issue 15
https://doi.org/10.5194/acp-18-11125-2018
https://doi.org/10.5194/acp-18-11125-2018
Technical note
 | 
09 Aug 2018
Technical note |  | 09 Aug 2018

Technical note: Comparison and interconversion of pH based on different standard states for aerosol acidity characterization

Shiguo Jia, Xuemei Wang, Qi Zhang, Sayantan Sarkar, Luolin Wu, Minjuan Huang, Jinpu Zhang, and Liming Yang

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Cited articles

Amdur, M. O. and Chen, L. C.: Furnace-generated acid aerosols: speciation and pulmonary effects, Environ. Health Perspect., 79, 147–150, https://doi.org/10.2307/3430541, 1989. 
Baucke, F. G.: New IUPAC recommendations on the measurement of pH – background and essentials, Anal. Bioanal. Chem., 374, 772–777, https://doi.org/10.1007/s00216-002-1523-4, 2002. 
Chen, W., Wang, X., Cohen, J. B., Zhou, S., Zhang, Z., Chang, M., and Chan, C.-Y.: Properties of aerosols and formation mechanisms over southern China during the monsoon season, Atmos. Chem. Phys., 16, 13271–13289, https://doi.org/10.5194/acp-16-13271-2016, 2016a. 
Chen, W., Wang, X., Zhou, S., Cohen, J. B., Zhang, J., Wang, Y., Chang, M., Zeng, Y., Liu, Y., and Ling, Z.: Chemical Composition of PM 2.5 and its Impact on Visibility in Guangzhou, Southern China, Aerosol Air Qual. Res., 16, 2349–2361, 2016b. 
Clegg, S. L. and Wexler, A. S.: Densities and Apparent Molar Volumes of Atmospherically Important Electrolyte Solutions. 1. The Solutes H2SO4, HNO3, HCl, Na2SO4, NaNO3, NaCl, (NH4)2SO4, NH4NO3, and NH4Cl from 0 to 50 C, Including Extrapolations to Very Low Temperature and to the Pure Liquid State, and NaHSO4, NaOH, and NH3 at 25 C, J. Phys. Chem. A, 115, 3393–3460, https://doi.org/10.1021/jp108992a, 2011. 
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Aerosol pH are often directly compared across studies while ignoring the inconsistency in standard states. This study attempts to address this issue by comparing aerosol pH with different standard states on the basis of theoretical considerations followed with a set of field data as an example. Application of a pH standardization protocol including a precise statement of thermodynamic model parameters is recommended to avoid biases in cross-comparison.
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