Tackling the Challenging Determination of Trace Elements in Ultrapure Silicon Carbide by LA-ICP-MS.

Autor: Spanu D; Department of Science and High Technology, University of Insubria, Via Valleggio 11, 22100 Como, Italy., Palestra A; Department of Science and High Technology, University of Insubria, Via Valleggio 11, 22100 Como, Italy., Prina V; Department of Science and High Technology, University of Insubria, Via Valleggio 11, 22100 Como, Italy., Monticelli D; Department of Science and High Technology, University of Insubria, Via Valleggio 11, 22100 Como, Italy., Bonanomi S; SiCreate GmbH, Via Piave 6, 23871 Lomagna, Italy., Nanot SU; SiCreate GmbH, Via Piave 6, 23871 Lomagna, Italy., Binda G; Norwegian Institute for Water Research (NIVA), Økernveien 94, 0579 Oslo, Norway., Rampazzi L; Department of Human Sciences and Innovation for the Territory, University of Insubria, Via Sant'Abbondio 12, 22100 Como, Italy., Sessa G; Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Luigi Mangiagalli 34, 20133 Milan, Italy., Callejo Munoz D; SiCreate GmbH, Via Piave 6, 23871 Lomagna, Italy., Recchia S; Department of Science and High Technology, University of Insubria, Via Valleggio 11, 22100 Como, Italy.
Jazyk: angličtina
Zdroj: Molecules (Basel, Switzerland) [Molecules] 2023 Mar 21; Vol. 28 (6). Date of Electronic Publication: 2023 Mar 21.
DOI: 10.3390/molecules28062845
Abstrakt: The goal of accurately quantifying trace elements in ultrapure silicon carbide (SiC) with a purity target of 5N (99.999% purity) was addressed. The unsuitability of microwave-assisted acid digestion followed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) analysis was proved to depend mainly on the contamination induced by memory effects of PTFE microwave vessels and by the purity levels of acids, even if highly pure ones were used in a clean environment. A new analytical protocol for the direct analysis of the solid material by laser ablation coupled with ICP-MS (LA-ICP-MS) was then exploited. Different samples were studied; the best results were obtained by embedding SiC (powders or grains) in epoxy resin. This technique has the great advantage of avoiding any source of external contamination, as grinding, pressing and sintering pretreatments are totally unnecessary. Two different laser wavelengths (266 and 193 nm) were tested, and best results were obtained with the 266 nm laser. The optimized protocol allows the determination of elements down to the sub-mg/kg level with a good accuracy level.
Databáze: MEDLINE
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