Decomposition of tin (IV) oxide, antimony (III) oxide and bismuth (III) oxide by fusion with ammonium iodide and its application for analysis of the environmental samples

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  • MATSUMOTO Ken
    Department of Chemistry, Faculty of Science, Kanazawa University
  • NISHIO Manabu
    Department of Chemistry, Faculty of Science, Kanazawa University
  • MISAKI Yukari
    Department of Chemistry, Faculty of Science, Kanazawa University
  • TERADA Kikuo
    Department of Chemistry, Faculty of Science, Kanazawa University

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Other Title
  • よう化アンモニウム融解による酸化すず（ＩＶ），酸化アンチモン（ＩＩＩ）及び酸化ビスマス（ＩＩＩ）の分解と分析への応用
  • ヨウ化アンモニウム融解による酸化スズ(IV),酸化アンチモン(III)及び酸化ビスマス(III)の分解と分析への応用
  • ヨウカ アンモニウム ユウカイ ニヨル サンカ スズ 4 サンカ アンチモン

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Abstract

A finely ground sample (SnO2, Sb2O3, Bi2O3, soils, ores, sediments and ashes of biological materials) was accurately weighed and placed in a simple decomposition tube (Pyrex glass, 15 mm o. d., 45 mm length) together with an excess amount of ammonium iodide and a small piece of platinum wire as a catalyst. The tube was attached to the cold trap (Pyrex glass, 20 mm o. d., 330 mm length) with the aid of hooks made on the wall of both tubes. While rotating, the bottom of the decomposition tube was gently heated with a small flame of the fish-tail burner for about one minute. The sublimates containing tin, antimony and bismuth iodides were condensed on the lower part of the inside wall of the cold trap. When the evolution of iodine ceased, the tube was removed from the flame and allowed to cool. The cold trap was detached from the decomposition tube and sublimates on the tube were completely dissolved in 20 ml of 2 M hydrochloric acid. The solution was collected into a 25 ml volumetric flask and made to the volume with 2 M hydrochloric acid. If further dilution is necessary, use of 2 M hydrochloric acid is preferable. Finally, the concentrations of tin, antimony and bismuth were determined by graphite furnace atomic absorption spectrometry at the 224.6 nm, 306.7 nm and 217.6 nm lines, respectively. The three metals did not interfere with each other in the atomic absorption measurement of each metal. Low contents of tin, antimony and bismuth in biological, environmental and geological materials were determined by the proposed method and the results obtained were in good agreement with those reported by other authors. The proposed method is simple, fast and accurate for the decomposition of the sparingly soluble SnO2, Sb2O3, and Bi2O3 and the determination of these elements.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 31 (3), 141-145, 1982

    The Japan Society for Analytical Chemistry

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