Iron from coal combustion particles dissolves much faster than mineral dust under simulated atmospheric acidic conditions

نویسندگان

چکیده

Abstract. Mineral dust is the largest source of aerosol iron (Fe) to offshore global ocean, but acidic processing coal fly ash (CFA) in atmosphere could be an important soluble Fe. Here, we determined Fe speciation and dissolution kinetics CFA from Aberthaw (United Kingdom), Krakow (Poland), Shandong (China) solutions which simulate atmospheric processing. In PM10 fractions, 8 %–21.5 % total was found hematite goethite (dithionite-extracted Fe), 2 %–6.5 amorphous (ascorbate-extracted while magnetite (oxalate-extracted Fe) varied 3 %–22 %. The remaining 50 %–87 associated with other Fe-bearing phases, possibly aluminosilicates. High concentrations ammonium sulfate ((NH4)2SO4), often wet aerosols, increased solubility up 7 times at low pH (2–3). oxalate effect on rates considerably, depending samples, no impact for doubled ash. However, this enhancement suppressed presence high (NH4)2SO4. Dissolution highly reactive (amorphous) insufficient explain CFA, modelled suggest that phases such as may also dissolve relatively rapidly under conditions. Overall, dissolved faster than a Saharan precursor sample 2. Based these laboratory data, developed new scheme proton- oxalate-promoted implemented into chemical transport model IMPACT (Integrated Massively Parallel Atmospheric Chemical Transport). revised showed better agreement observations particles over Bay Bengal, due initial rapid release suppression pH. improved enabled us predict sensitivity more dynamic range changes, particularly between anthropogenic combustion biomass burning aerosols.

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ژورنال

عنوان ژورنال: Atmospheric Chemistry and Physics

سال: 2022

ISSN: ['1680-7316', '1680-7324']

DOI: https://doi.org/10.5194/acp-22-6045-2022