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Acidity of size-fractionated aerosol particles

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Abstract

At three locations in NE-Bavaria (Central Europe), aerosol particles were collected in five size fractions with a cascade impactor. The water soluble part of each fraction was analyzed for major ions and strong, weak and neutralizing acidities. For reliable determination of these categories of acidity, a comparison between different methods was initially performed. Further study revealed a distinct difference in amount and character of the acidity between fine (Dp < 1.35 μm) and coarse (Dp > 4.05 μm) particles. Fine particles always reacted acidic and their acidity was mainly due to strong acids. Concentrations were highest in polluted urban air, where additional weak organic acids were present in fine particles. The in situ pH's were calculated as pH 1...2 for these particles at all sampling sites. Coarse particles were only slightly acidic, with a mean in situ pH 5.5...6.5. Their acidity was mainly caused by weak acids, especially hydroxilized metal ions dominated by Al.

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Author notes

  1. J. Ludwig

    Present address: Fraunhofer-Institut für Atmosphärische Umweltforschung, Kreuszeckbahnstr. 19, D-8100, Garmisch-Partenkirchen, Germany

  2. O. Klemm

    Present address: Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, 03824, Durham, N.H., USA

Authors and Affiliations

  1. Institute of Hydrology, University of Bayreuth, P.O. Box 101251, D-8580, Bayreuth, Germany

    J. Ludwig & O. Klemm

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Ludwig, J., Klemm, O. Acidity of size-fractionated aerosol particles. Water Air Soil Pollut 49, 35–50 (1990). https://doi.org/10.1007/BF00279508

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  • DOI: https://doi.org/10.1007/BF00279508

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