Iron-induced hydroxyl radical generation from basaltic volcanic ash

Details Iron-induced hydroxyl radical generation from basaltic volcanic ash Iron-induced hydroxyl radical generation from basaltic volcanic ash

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007e%26psl.261..662h&link_type=abstract

Earth and Planetary Science Letters, Volume 261, Issue 3-4, p. 662-669.

Physics

2

Scientific paper

Iron-induced hydroxyl radical generation from the surface of volcanic ash particles is a possible mechanism of respiratory toxicity in addition to crystalline silica induced pathogenicity. Here we show that volcanic ash generates hydroxyl radicals, with greater reactivity in iron-rich, silica-poor samples, such as basaltic ash. Basaltic particles expose at the surface high levels of poorly-coordinated iron ions in both Fe(II) and Fe(III) oxidation states which are likely to be the cause of such reactivity. Hitherto, basaltic ash has been disregarded as a hazard due to the lack of crystalline silica particulate but future hazard assessment should consider its toxic potential.

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