Analytical Chemistry for Advanced Technologies. Rapid decomposition and analysis of refractory barium sulfate by fusion with ammonium salt.

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  • MATSUMOTO Ken
    Department of Chemistry, Faculty of Science, Kanazawa University
  • KOURA Toshihiro
    Department of Chemistry, Faculty of Science, Kanazawa University

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Other Title
  • 高度技術を支える分析化学　　アンモニウム塩融解による難溶性硫酸バリウムの迅速分解・分析
  • アンモニウム塩融解による難溶性硫酸バリウムの迅速分解・分析
  • アンモニウムエン ユウカイ ニ ヨル ナン ヨウセイ リュウサン バリウム ノ ジンソク ブンカイ ブンセキ

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Abstract

A simple and rapid method for the decomposition of refractory barium sulfate has been proposed. Barium samples (BaSO4, ore) were decomposed by fusion with ammonium hydrogen sulfate, which was found to be a suitable powerful flux for dissolving various refractory sulfates. An accurately weighed sample (ca. 10 mg) was placed in a dry Pyrex test tube (18 mm o.d., 200 mm length). Ammonium hydrogen sulfate (ca. 2 g) was added to the tube and mixed with the sample by agitating the tube. The bottom of the test tube was gently heated along with a swirling motion over a small gas flame of a Bunsen burner with a fish-tail at a temperature of ca. 550∼600°C. Heating was continued until the melt changed into a colorless, clean and translucent form. Barium sulfate was dissolved by heating for about 5 min. After cooling, the solidified melt was dissolved in 30 ml of a 0.05 M EDTA-ammoniacal solution (3.5 M in ammonia). Finally, the concentration of the barium in the resulting solution was determined by ICP-AES or flame photometry. The proposed method was successfully applied to various sulfates and ores. The barium and other metals in the samples were determined and the analytical results of barium were in good agreement with the values obtained by fusion with alkali metal carbonate.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 50 (12), 807-811, 2001

    The Japan Society for Analytical Chemistry

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