Aerosol Research
Aerosol Research
Aerosol Research
Articles | Volume 4, issue 1
Articles | Volume 4, issue 1
https://doi.org/10.5194/ar-4-81-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ar-4-81-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 4, issue 1
Research article
 | 
24 Feb 2026
Research article |  | 24 Feb 2026

Online water-soluble iron speciation in ambient aerosols under cloud-water-relevant and neutral conditions

Sabine Lüchtrath, Sven Klemer, Florian Fröhlich, Darius Ceburnis, Dominik van Pinxteren, Hartmut Herrmann, Wolfgang Frenzel, and Andreas Held

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Short summary
The first online instrument for the speciation of water‑soluble iron in ambient aerosols is presented. The system combines flow injection analysis with spectrophotometric detection using a liquid waveguide capillary cell. Sensitive iron speciation will help to better describe tropospheric aqueous-phase reactions driven by soluble iron, e.g. hydroxyl radical formation through Fenton chemistry. In first measurements in Berlin, ambient water-soluble-iron concentrations reached up to 47 ng m-3.
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