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RESEARCH ARTICLE (Open Access)

Iron dissolution and speciation from combustion particles under environmentally relevant conditions

Cecily Szady https://orcid.org/0009-0006-3360-3168 A , Grace Picarillo https://orcid.org/0009-0007-0782-161X A , Emily J. Davis https://orcid.org/0000-0001-6867-7745 A , Donata Drapanauskaite B C , Kristina Buneviciene B C , Jonas Baltrusaitis https://orcid.org/0000-0001-5634-955X B and Juan G. Navea https://orcid.org/0000-0002-7723-6033 A *
+ Author Affiliations
- Author Affiliations

A Chemistry Department, Skidmore College, Saratoga Springs, NY 12866-1632, USA.

B Department of Chemical and Biomolecular Engineering, Lehigh University, B336 Iacocca Hall, 111 Research Drive, Bethlehem, PA 18015, USA.

C Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, Kedainiai dist., Instituto av. 1, Akademija LT-58344, Lithuania.

* Correspondence to: jnavea@skidmore.edu

Handling Editor: Zongbo Shi

Environmental Chemistry 20(4) 171-182 https://doi.org/10.1071/EN23022
Submitted: 15 March 2023  Accepted: 17 July 2023   Published: 8 August 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Environmental context. Iron-containing combustion particles are likely to contribute to environmental iron deposition, while atmospheric acidic processing of such particles can promote their dissolution. Here we report the surface-mediated dissolution of iron from ashes generated by biomass burning power plants and kilns. Examination of the dissolution process at several environmentally relevant pHs, suggests that pH has little impact on the fraction of bioavailable Fe(II) that dissolves into the aqueous phase, although Fe(III) is heavily pH dependent.

Rationale. Anthropogenic combustion particles, such as ash produced in power plants or kilns, are byproducts with limited use that accumulate in large deposits and become materials of environmental concern. While stored, these particles can be carried by winds into the atmosphere or into soil or near water bodies. Recent studies suggest that a fraction of metals present in the environment come from combustion particles.

Methodology. In this study, we carry out a comparative study of iron dissolution and speciation from two different combustion particles: bottom ash from a biomass-fired power plant (BA) and lime kiln dust (LKD). Samples were fully characterised and their iron leaching was investigated in aqueous suspensions under environmentally relevant acidic conditions. Iron analysis and speciation was carried out calorimetrically.

Results. For the combustion particles examined, the fraction of bioavailable Fe2+ is lower than Fe3+. The solubility of Fe3+ is highly dependent on pH, dropping significantly at pHs higher than 3. On the other hand, the solubility of Fe2+ from both BA and LKD was found to be relatively constant over the range of pH investigated.

Discussion. Iron availability from combustion particles with similar mineralogy is driven by the particle’s surface properties. While iron from LKD dissolves faster than that from BA, the initial rate of dissolution of iron remains statistically constant at pHs relevant for the atmospheric aerosol deliquescent layer, decreasing at pHs above 3. This work provides insight into the ability of combustion particles to provide iron micronutrients under different environmentally relevant acidic conditions.

Keywords: acidic processing, atmospheric chemistry, bioavailability, biogeochemistry, combustion particles, iron dissolution, speciation.


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