Biogeosciences
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Articles | Volume 20, issue 14
Articles | Volume 20, issue 14
https://doi.org/10.5194/bg-20-2883-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-20-2883-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 20, issue 14
Research article
 | 
20 Jul 2023
Research article |  | 20 Jul 2023

Estuarine flocculation dynamics of organic carbon and metals from boreal acid sulfate soils

Joonas J. Virtasalo, Peter Österholm, and Eero Asmala

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Short summary
We mixed acidic metal-rich river water from acid sulfate soils and seawater in the laboratory to study the flocculation of dissolved metals and organic matter in estuaries. Al and Fe flocculated already at a salinity of 0–2 to large organic flocs (>80 µm size). Precipitation of Al and Fe hydroxide flocculi (median size 11 µm) began when pH exceeded ca. 5.5. Mn transferred weakly to Mn hydroxides and Co to the flocs. Up to 50 % of Cu was associated with the flocs, irrespective of seawater mixing.
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