コバルト中の微量ニッケルの分離定量

概要

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A method for the determination of trace of Ni in metallic cobalt and/or cobalt compounds was developed. The bulk of Co and other interfering metals were removed by means of solvent extraction with high molecular weight amines such as Amberlite XE-204 or tri-n-octylamine. The remaining Ni in aqueous phase was determined by colorimetry using 1-(2-pyridylazo)-2-naphthol. The percent extractions of metals such as Mn(II), Fe(III), Co, Ni, Cu and Zn from solutions of various concentrations of hydrochloric acid with a 5% solution of Amberlite XE-204 inxylene were shown in Fig. 1. Quantitative extraction was obtained for Fe(III) from 210N and for Zn from 26N HCl. Cu and Co were extracted in ca. 95% yield from 6N and 8N HCl solutions respectively. Mn(II) was extracted only in 25% yield even at its maximum. Ni was not extracted from HCl solution of any concentration. If the extraction was carried out from 8N HCl solutions, two successive extractions were sufficient to separate a large amount of Co from Ni (as shown in Table I).The effects of diverse metals were summarized in Table II. Interferences by Fe, Cu and Zn could be removed by amine extraction, and Cr and Mn did not interfere with the colorimetric determination. 0. 0050.1% Ni was successfully determined.
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