期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 261, 期 3-4, 页码 662-669出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2007.07.032
关键词
volcanic ash; basalt; iron; respiratory health hazard; free-radical generation; Fenton activity
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. (c) 2007 Elsevier B.V. All rights reserved.
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