Role of pH in Aerosol Processes and Measurement Challenges

doi:10.1021/acs.jpca.8b10676

Title: Role of pH in Aerosol Processes and Measurement Challenges

Abstract

pH is one of the most basic chemical properties of aqueous solution, but its measurement in nanoscale aerosol particles presents many challenges. The pH of aerosol particles is of growing interest in the atmospheric chemistry community because of its demonstrated effects on heterogeneous chemistry and human health, as well as potential effects on climate. The authors have shown that phase transitions of aerosol particles are sensitive to pH, focusing on systems that undergo liquid-liquid phase separation. Currently, aerosol pH is calculated indirectly from knowledge of species present in the gas and aerosol phases through the use of thermodynamic models. From these models, ambient aerosol is expected to be highly acidic (pH ~ 0-3). Direct measurements have focused on model systems due to the difficulty of this measurement. This area is one in which physical chemists should be encouraged to contribute because of the potential consequences for aerosol processes in the environment.

Authors:

^[1]; Ott, Emily-Jean E. ^[1]; Marak, Katherine E. ^[1]

Pennsylvania State Univ., University Park, PA (United States)

Publication Date:: 2018-12-26

Research Org.:: Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)

OSTI Identifier:: 1491413

Alternate Identifier(s):: OSTI ID: 1508822

Grant/Contract Number:: SC0018032; AGS-1723290; DE SC0018032

Resource Type:: Published Article

Journal Name:: Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory

Additional Journal Information:: Journal Volume: 123; Journal Issue: 7; Journal ID: ISSN 1089-5639

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats


                    Freedman, Miriam Arak, Ott, Emily-Jean E., and Marak, Katherine E. Role of pH in Aerosol Processes and Measurement Challenges.  United States: N. p., 2018. 
        Web.  doi:10.1021/acs.jpca.8b10676.

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                    Freedman, Miriam Arak, Ott, Emily-Jean E., & Marak, Katherine E. Role of pH in Aerosol Processes and Measurement Challenges.  United States.  doi:10.1021/acs.jpca.8b10676.

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                    Freedman, Miriam Arak, Ott, Emily-Jean E., and Marak, Katherine E. Wed .  
        "Role of pH in Aerosol Processes and Measurement Challenges".  United States.  doi:10.1021/acs.jpca.8b10676.

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@article{osti_1491413,

  title        = {Role of pH in Aerosol Processes and Measurement Challenges},

  author       = {Freedman, Miriam Arak and Ott, Emily-Jean E. and Marak, Katherine E.},

  abstractNote = {pH is one of the most basic chemical properties of aqueous solution, but its measurement in nanoscale aerosol particles presents many challenges. The pH of aerosol particles is of growing interest in the atmospheric chemistry community because of its demonstrated effects on heterogeneous chemistry and human health, as well as potential effects on climate. The authors have shown that phase transitions of aerosol particles are sensitive to pH, focusing on systems that undergo liquid-liquid phase separation. Currently, aerosol pH is calculated indirectly from knowledge of species present in the gas and aerosol phases through the use of thermodynamic models. From these models, ambient aerosol is expected to be highly acidic (pH ~ 0-3). Direct measurements have focused on model systems due to the difficulty of this measurement. This area is one in which physical chemists should be encouraged to contribute because of the potential consequences for aerosol processes in the environment.},

  doi          = {10.1021/acs.jpca.8b10676},

  journal      = {Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory},

  number       = 7,

  volume       = 123,

  place        = {United States},

  year         = {2018},

  month        = {12}

}

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DOI: 10.1021/acs.jpca.8b10676

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Cited by: 4 works

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Figure 1: Acidic aerosol can cause damage to the lungs through dissolution of metals, oxidative stress, and inflammation.

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