ACTIVATION AND DETOXIFICATION OF UICC CROCIDOLITE - THE EFFECT OF CONVERSION OF OXIDATION-STATE OF IRON ON THE TOXICITY OF THE FIBERS

M GULUMIAN*, H POLLAK

*Corresponding author for this work

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Abstract

Detoxification of crocidolite, an asbestiform riebeckite with a coating of ferric salt, converted some of the ferrous ions into ferric ions and therefore decreased the activity of the fibres to catalyse the reduction of oxygen and hydrogen peroxide. The H-2-activation of crocidolite fibres on the other hand, changed some of the ferric ions into ferrous ions and therefore increased the capacity of the fibres to catalyse these two reactions. Mossbauer spectroscopy (MS) combined with wet chemical analysis, X-ray diffraction, X-ray fluorescence, and neutron activation analysis enabled us to determine the site occupancies of iron and magnesium in UICC (Union Internationale Contre le Cancer) crocidolite and the ratio of the recoil-free fractions f(Fe 2+)/f(Fe 3 +) =0.86 +/- 0.07. These results and further MS studies with detoxified and activated fibres explained the effect of the two processes on the activity of iron in the fibres.

Original languageEnglish
Pages (from-to)180-182
Number of pages3
JournalNuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms
Volume76
Issue number1-4
Publication statusPublished - Apr-1993
Event3RD INTERNATIONAL SYMP ON THE INDUSTRIAL APPLICATIONS OF THE MOSSBAUER EFFECT - , Japan
Duration: 24-Aug-199227-Aug-1992

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