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On the speciation of iodine in aerosol
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  • Juan Carlos Gomez Martin,
  • Alfonso Saiz-Lopez,
  • Carlos Alberto Cuevas,
  • Alex Baker,
  • Rafael Pedro Fernandez
Juan Carlos Gomez Martin
Instituto de Astrofísica de Andalucía

Corresponding Author:[email protected]

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Alfonso Saiz-Lopez
Spanish National Research Council (CSIC)
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Carlos Alberto Cuevas
Spanish National Research Council (CSIC)
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Alex Baker
University of East Anglia
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Rafael Pedro Fernandez
National Research Council (CONICET)
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We have compiled and analyzed a comprehensive dataset of field observations of iodine speciation in marine aerosol. The soluble iodine content of fine aerosol (PM1) is dominated by soluble organic iodine (SOI) (~50%) and iodide (~30%), while the coarse fraction is dominated by iodate (~50%), with non-negligible amounts of iodide (~20%). The SOI fraction shows an equatorial maximum and minima coinciding with the ocean ‘deserts’, which suggests a link between soluble iodine speciation in aerosol and ocean productivity. Among the mayor aerosol ions, organic anions and non-sea-salt sulfate show positive correlations with SOI in PM1. Alkaline cations are positively correlated to iodate and negatively correlated with SOI and iodide in coarse aerosol. These relationships suggest that under acidic conditions iodate is reduced to HOI, which reacts with organic matter to form SOI, a possible source of iodide. In less acidic sea-salt or dust-rich coarse aerosols, HOI oxidation to iodate and reaction with organic matter likely compete.