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Nickel release and surface characteristics of fine powders of nickel metal and nickel oxide in media of relevance for inhalation and dermal contact
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: 0000-0003-2145-3650
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0003-2206-0082
2013 (English)In: Regulatory toxicology and pharmacology, ISSN 0273-2300, E-ISSN 1096-0295, Vol. 65, no 1, 135-146 p.Article in journal (Refereed) Published
Abstract [en]

Differences in surface oxide characteristics and extent of nickel release have been investigated in two thoroughly characterized micron-sized (mainly <4 mu m) nickel metal powders and a nickel oxide bulk powder when immersed in two different synthetic fluids, artificial sweat (ASW-pH 6.5) and artificial lysosomal fluid (ALF-pH 4.5) for time periods up to 24 h. The investigation shows significantly more nickel released from the nickel metal powders (<88%) compared to the NiO powder (<0.1%), attributed to differences in surface properties. Significantly more nickel was released from the nickel metal powder with a thin surface oxide predominantly composed of non-stoichiometric nickel oxide (probably Ni2O3), compared to the release from the nickel metal powder with a thicker surface oxide predominantly composed of NiO and to a lesser extent Ni2O3 (88% and 25% release after 24 h in ALF, respectively). Significantly lower amounts of nickel were released from the nickel metal powders in ASW (2.2% and <1%, respectively). The importance of particle and surface characteristics for any reliable risk assessment is discussed, and generated data compared with literature findings on bioaccessibility (released fraction) of nickel from powders of nickel metal and nickel oxide, and massive forms of nickel metal and nickel-containing alloys.

Place, publisher, year, edition, pages
2013. Vol. 65, no 1, 135-146 p.
Keyword [en]
Nickel, Nickel Oxide, Particles, Surface composition, Metal release, Dissolution, Complexation
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-107899DOI: 10.1016/j.yrtph.2012.10.014ISI: 000313610900017Scopus ID: 2-s2.0-84871432963OAI: oai:DiVA.org:kth-107899DiVA: diva2:578755
Funder
Swedish Research CouncilFormas
Note

QC 20130214

Available from: 2012-12-18 Created: 2012-12-18 Last updated: 2017-12-06Bibliographically approved

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Hedberg, YolandaOdnevall Wallinder, Inger

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