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

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

doi:10.5194/ar-4-81-2026

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

Data sets

Online Water-Soluble Iron Speciation in Ambient Aerosols under Cloud-Water Relevant and Neutral Conditions S. Lüchtrath and A. Held https://doi.org/10.5281/zenodo.18682099

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.