Matsumiya Hiroaki, Kato Tatsuya, Hiraide Masataka
Division of Environmental Research, EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
Talanta. 2014 Feb;119:505-8. doi: 10.1016/j.talanta.2013.11.057. Epub 2013 Nov 28.
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-μg g(-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.
对高纯度材料中的痕量杂质进行分析是一项重要且具有挑战性的任务。本文描述了一种简便且灵敏的方法，用于测定高纯铁金属中的痕量重金属。通过萃取到少量离子液体[1-丁基-3-甲基咪唑双（三氟甲磺酰）亚胺]中，铁样品溶液中的痕量重金属被快速且选择性地预富集，以通过石墨炉原子吸收光谱法（GFAAS）进行测定。发现一种供氮中性配体2,4,6-三（2-吡啶基）-1,3,5-三嗪（TPTZ）在基于离子液体的选择性萃取中有效，可使铁基体几乎完全（约99.8%）消除。与优化后的GFAAS相结合取得了成功。在铁金属中，检测限达到亚μg g⁻¹水平。TPTZ在基于离子液体的萃取后接GFAAS的新应用成功地应用于高纯铁金属标准参考物质中痕量钴、镍、铜、镉和铅的测定。
