Elimination of interference by iodide in determination of mercury by cold-vapor AAS.

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  • KORENAGA Takashi
    Center for Environmental Science and Technology, Okayama University
  • YAMADA Etsu
    Center for Waste Water Treatment, Kyoto Institute of Technology, Matsugasaki
  • HARA Yumiko
    Analysis and Treatment Center for Environmental Protection, Nagasaki University
  • SAKAMOTO Hayao
    Department of Chemistry, Faculty of Science, Kagoshima University
  • CHOHJI Tetsuji
    Department of Chemistry, Faculty of Science, Kagoshima University
  • NAKAGAWA Chie
    Environment Protection Center, Kanazawa University
  • IKATSU Hisayoshi
    Environment Protection Center, Kanazawa University
  • IZAWA Miyoko
    Center for Environmental Science and Technology, Okayama University
  • GOTO Masashi
    Research Center for Resource and Energy Conservation, Nagoya University

Bibliographic Information

Other Title
  • 還元気化原子吸光法による水銀分析におけるヨウ化物の干渉とその除去―改良法
  • カンゲン キカ ゲンシ キュウコウホウ ニ ヨル スイギン ブンセキ ニ オケ
  • 還元気化原子吸光法による水銀分析におけるヨウ化物の干渉とその除去-改良法(<特集>環境汚染物質の分析化学)
  • 複雑組成廃棄物の分析技術開発に関する研究(第1報)

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Abstract

The improved method is developed for the usual mecury determination by cold-vapor AAS with acidic tin(II) after digestion of the sample. In the Japanese official method, iodide and its related compounds interfered with the trace mercury determination. Hence, the improvement of the official method is necessary for complicated environmental samples such as waste waters from university laboratories. The determination procedures are as follows: An aliquot (less than 100 ml) of sample solution is taken into a reaction vessel after digestion with potassium peroxodisulfate in a diluted sulfuric acid solution heated at 95 °C for 1 h. To the solution, 10 ml of 5 M sodium hydroxide, 2 ml of 1000 mg/l Cu2+ solution, 10 ml of 5% potassium zinc cyanide solution, and 2 ml of 10% tin(II) chloride solution are added, and the evolved mercury is measured with an atomic absorption spectrometer at 253.7 nm. The reducing power of tin(II) in alkaline solution is stronger than that in acidic solution because the standard redox potential for tin(II) is -0.93V vs. NHE at pH 14 (0.15V vs. NHE in acidic). However, potassium zinc cyanide is added as a masking agent for silver(I) ion because it interferes with the improved alkaline method. The detection limit and precision of the improved method are 0.5μg/l and 3%, respectively. The method was applied to the determination of mercury in waste water samples containing iodide with satisfactory results.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 36 (3), 194-198, 1987

    The Japan Society for Analytical Chemistry

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