Simultaneous Determination of Free Zinc Oxide and Free Copper Oxide in Copper-Zinc Ferrite (Determination of Free Oxide in Ferrite, Part II)

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  • 銅-亜鉛フェライト中の遊離酸化亜鉛および酸化銅の同時定量
  • ドウ-アエン フェライト チュウ ノ ユウリ サンカ アエン オヨビ サンカ ドウ ノ ドウジ テイリョウ

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Abstract

In an earlier work, the determination of free zinc oxide in manganese-zinc ferrite was studied by the authors. The present work has been done in order to establish an optimum simultaneous determination condition of free zinc oxide and free copper oxide in copper-zinc ferrite. Experiments of selection of suitable extracting agent for simultaneous extraction of free zinc oxide and free copper oxide, extracting condition, and rapid volumetric determination of zinc and copper in the extract with disodium ethylenediamine tetraacetate in the presence of potassium cyanide as a masking agent were carried out, with the following findings: (1) Extraction is nearly complete in 1 hour or more for free zinc oxide in ferrite at 90°C in 12% ammonium acetate solution, or in 8 hours or more for free copper oxide under the same conditions. (2) The temperature at which free zinc oxide in copper-zinc ferrite disappears differs appreciably from that for free copper oxide. (3) When the sample of ferrite described above is treated for 1 hour or more at 90°C in 10% sodium hydroxide solution, free zinc oxide only can be extracted. (4) There is a good agreement between the results of estimation of free zinc oxide in ferrite obtained by the ammonium acetate extraction method and the sodium hydroxide extraction method.

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