Iron dissolution and speciation from combustion particles under environmentally relevant conditions

Environmental context Iron-containing combustion particles are likely to contribute environmental iron deposition, while atmospheric acidic processing of such can promote their dissolution. Here we report the surface-mediated dissolution from ashes generated by biomass burning power plants and kilns. Examination process at several environmentally relevant pHs, suggests that pH has little impact on fraction bioavailable Fe(II) dissolves into aqueous phase, although Fe(III) is heavily dependent. Rationale Anthropogenic particles, as ash produced in or kilns, byproducts with limited use accumulate large deposits become materials concern. While stored, these be carried winds atmosphere soil near water bodies. Recent studies suggest a metals present environment come particles. Methodology In this study, carry out comparative study speciation two different particles: bottom biomass-fired plant (BA) lime kiln dust (LKD). Samples were fully characterised leaching was investigated suspensions under conditions. Iron analysis calorimetrically. Results For examined, Fe2+ lower than Fe3+. The solubility Fe3+ highly dependent pH, dropping significantly pHs higher 3. On other hand, both BA LKD found relatively constant over range investigated. Discussion availability similar mineralogy driven particle’s surface properties. faster BA, initial rate remains statistically for aerosol deliquescent layer, decreasing above This work provides insight ability provide micronutrients