Removal of chloride interference in the determination of thallium by AAS with a graphite furnace.

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  • MATSUSAKI Koji
    Department of Industrial Chemistry, Technical College, Yamaguchi University
  • YOSHINO Takashi
    Department of Industrial Chemistry, Faculty of Engineering, Yamaguchi University

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Other Title
  • 黒鉛炉原子吸光法によるタリウムの定量における塩化物干渉の除去
  • コクエンロ ゲンシ キュウコウホウ ニ ヨル タリウム ノ テイリョウ ニ オ

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Abstract

Method for removal of the chloride interference in the determination of thallium by AAS with a graphite furnace has been investigated. The chloride interference arises from formation of thallium (I) chloride in the sample solution; this has been confirmed by examine the effects of coexisting chloride concentration and pH of sample solution on the atomic absorption signal of thallium. The ammonium salt of EDTA is very suitable as an additive to remove the chloride interference, since chloride formation of thallium and other cations can be masked by EDTA. Furthermore, the use of this salt yields readily volatile ammonium chloride which can be easily removed from the furnace in drying and ashing steps. In the presence of 0.02M EDTA at pH 10 with ammonia the maximum allowable concentration of coexisting metallic chloride is about 400times larger than in 0.1M nitric acid and 40times than in 0.05M sulfuric acid.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 35 (11), 931-934, 1986

    The Japan Society for Analytical Chemistry

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