Ionic liquid-based extraction followed by graphite-furnace atomic absorption spectrometry for the determination of trace heavy metals in high-purity iron metal

The analysis of high-purity materials for trace impurities is an important and challenging task. The present paper describes a facile and sensitive method for the determination of trace heavy metals in high-purity iron metal. Trace heavy metals in an iron sample solution were rapidly and selectively...

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Bibliographic Details
Published in:Talanta (Oxford) 2014-02, Vol.119, p.505-508
Main Authors: Matsumiya, Hiroaki, Kato, Tatsuya, Hiraide, Masataka
Format: Article
Language:English
Subjects:
2,4,6-Tris(2-pyridyl)-1,3,5-triazine
Atomic absorption analysis
Extraction
Graphite-furnace atomic absorption spectrometry
Heavy metal
Heavy metals
High-purity iron metal
Ionic liquid-based extraction
Iron
Lead (metal)
Ligands
Tasks
Trace analysis
Trace impurities
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Summary:The analysis of high-purity materials for trace impurities is an important and challenging task. The present paper describes a facile and sensitive method for the determination of trace heavy metals in high-purity iron metal. Trace heavy metals in an iron sample solution were rapidly and selectively preconcentrated by the extraction into a tiny volume of an ionic liquid [1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide] for the determination by graphite-furnace atomic absorption spectrometry (GFAAS). A nitrogen-donating neutral ligand, 2,4,6-tris(2-pyridyl)-1,3,5-triazine (TPTZ), was found to be effective in the ionic liquid-based selective extraction, allowing the nearly complete (~99.8%) elimination of the iron matrix. The combination with the optimized GFAAS was successful. The detectability reached sub-μgg−1 levels in iron metal. The novel use of TPTZ in ionic liquid-based extraction followed by GFAAS was successfully applied to the determination of traces of Co, Ni, Cu, Cd, and Pb in certified reference materials for high-purity iron metal. [Display omitted] •A nitrogen-donating neutral ligand was employed for ionic liquid-based extraction.•Trace heavy metals were extracted within 1min from an aqueous sample solution.•The extractive preconcentration was combined with the optimized GFAAS.•The extraction was selective enough to analyze high-purity iron metal for impurities.•The detectability reached sub-µgg−1 levels in iron metal.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2013.11.057