The release of iron from different asbestos structures by hydrogen peroxide with concomitant O generation

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Abstract
Treatment of aqueous suspensions of different asbestos fibers (amosite, anthophyllite, chrysotile, and crocidolite) at 0-4°C and pH 7.2 with H O results in the consumption of H O with concomitant release of iron and production of O. During incubations, [H O] decreased in proportion to the mass of the suspended fiber, the duration of incubation, and the initial [H O]. The consumption of H O, production of O and release of iron all vary synergistically with the structure of the asbestos fiber. Release of silicon during the incubation was small relative to the decrement in [H O], reflecting a lack of dissolution of the fiber. The data are consistent with a redox process for the release of surface bound iron and it is significant that iron release occurs in the absence of a Fe(II) or Fe(III) chelator. The implications of iron release from the asbestos surface may be important in inflammatory disorders in which both silicate bound iron and H O accumulate. © Rapid Science 1998.

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