Simulated atmospheric processing of iron oxyhydroxide minerals at low pH: roles of particle size and acid anion in iron dissolution

Gayan Rubasinghege; Robert W Lentz; Michelle M Scherer; Vicki H Grassian

doi:10.1073/pnas.0910809107

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Simulated atmospheric processing of iron oxyhydroxide minerals at low pH: roles of particle size and acid anion in iron dissolution

Journal article

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Simulated atmospheric processing of iron oxyhydroxide minerals at low pH: roles of particle size and acid anion in iron dissolution

Gayan Rubasinghege, Robert W Lentz, Michelle M Scherer and Vicki H Grassian

Proceedings of the National Academy of Sciences - PNAS, Vol.107(15), pp.6628-6633

04/13/2010

DOI: 10.1073/pnas.0910809107

PMCID: PMC2872379

PMID: 20360560

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Abstract

A number of recent studies have shown that iron dissolution in Fe-containing dust aerosol can be linked to source material (mineral or anthropogenic), mineralogy, and iron speciation. All of these factors need to be incorporated into atmospheric chemistry models if these models are to accurately predict the impact of Fe-containing dusts into open ocean waters. In this report, we combine dissolution measurements along with spectroscopy and microscopy to focus on nanoscale size effects in the dissolution of Fe-containing minerals in low-pH environments and the importance of acid type, including HNO(3), H(2)SO(4), and HCl, on dissolution. All of these acids are present in the atmosphere, and dust particles have been shown to be associated with nitrate, sulfate, and/or chloride. These measurements are done under light and dark conditions so as to simulate and distinguish between daytime and nighttime atmospheric chemical processing. Both size (nano- versus micron-sized particles) and anion (nitrate, sulfate, and chloride) are found to play significant roles in the dissolution of alpha-FeOOH under both light and dark conditions. The current study highlights these important, yet unconsidered, factors in the atmospheric processing of iron-containing mineral dust aerosol.

Temperature

Models, Chemical

Environmental Monitoring - methods

Ferric Compounds - chemistry

Sulfuric Acids - chemistry

Iron

Particle Size

Anions

Dust

Particulate Matter - chemistry

Nitric Acid - chemistry

Hydrochloric Acid - chemistry

Atmosphere - chemistry

Air Pollutants - chemistry

Hydrogen-Ion Concentration

Details

Title: Subtitle: Simulated atmospheric processing of iron oxyhydroxide minerals at low pH: roles of particle size and acid anion in iron dissolution
Creators: Gayan Rubasinghege - Department of Chemistry, University of Iowa, Iowa City IA 52242, USA
Robert W Lentz
Michelle M Scherer
Vicki H Grassian
Resource Type: Journal article
Publication Details: Proceedings of the National Academy of Sciences - PNAS, Vol.107(15), pp.6628-6633
DOI: 10.1073/pnas.0910809107
PMID: 20360560
PMCID: PMC2872379
NLM abbreviation: Proc Natl Acad Sci U S A
ISSN: 0027-8424
eISSN: 1091-6490
Publisher: United States
Language: English
Date published: 04/13/2010
Academic Unit: Civil and Environmental Engineering; Occupational and Environmental Health; Chemistry; Chemical and Biochemical Engineering
Record Identifier: 9983992052302771

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