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Bioaccessibility of micron-sized powder particles of molybdenum metal, iron metal, molybdenum oxides and ferromolybdenum - Importance of surface oxides
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0003-2206-0082
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0003-2145-3650
2015 (English)In: Regulatory toxicology and pharmacology, ISSN 0273-2300, E-ISSN 1096-0295, Vol. 72, no 3, 447-457 p.Article in journal (Refereed) Published
Abstract [en]

The European chemical framework REACH requires that hazards and risks posed by chemicals, including alloys and metals, that are manufactured, imported or used in different products (substances or articles) are identified and proven safe for humans and the environment. Metals and alloys need hence to be investigated on their extent of released metals (bioaccessibility) in biologically relevant environments. Read-across from available studies may be used for similar materials. This study investigates the release of molybdenum and iron from powder particles of molybdenum metal (Mo), a ferromolybdenum alloy (FeMo), an iron metal powder (Fe), MoO<inf>2</inf>, and MoO<inf>3</inf> in different synthetic body fluids of pH ranging from 1.5 to 7.4 and of different composition. Spectroscopic tools and cyclic voltammetry have been employed to characterize surface oxides, microscopy, light scattering and nitrogen absorption for particle characterization, and atomic absorption spectroscopy to quantify released amounts of metals. The release of molybdenum from the Mo powder generally increased with pH and was influenced by the fluid composition. The mixed iron and molybdenum surface oxide of the FeMo powder acted as a barrier both at acidic and weakly alkaline conditions. These findings underline the importance of the surface oxide characteristics for the bioaccessibility of metal alloys.

Place, publisher, year, edition, pages
2015. Vol. 72, no 3, 447-457 p.
Keyword [en]
Alloy, Bioaccessibility, Ferromolybdenum, Molybdenum, Surface oxide
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URN: urn:nbn:se:kth:diva-170198DOI: 10.1016/j.yrtph.2015.05.027ISI: 000360255700003PubMedID: 26032492ScopusID: 2-s2.0-84930643781OAI: diva2:828218
Swedish Research Council, 2013-5621

QC 20150630

Available from: 2015-06-30 Created: 2015-06-29 Last updated: 2015-09-18Bibliographically approved

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Mörsdorf, AlexanderOdnevall Wallinder, IngerHedberg, Yolanda
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