A STUDY OF GENERATING CONDITIONS AND THE SAMPLING METHOD OF CYANIDES IN THE ATMOSPHERIC AIR

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  • 大気中シアン化合物の生成条件と捕集方法の研究
  • タイキ チュウ シアン カゴウブツ ノ セイセイ ジョウケン ト ホシュウ ホウホウ ノ ケンキュウ

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Description

Atmospheric concentrations of cyanides in various kinds of plating workshops were determined, and it was cleared that there was an intimate relation between the atmospheric concentration of cyanides and pH of the plating solutions. The more alkaline the solution, the less became the concentration of cyanides. Cyanides contained in the overflowed solution from the plating bath changed to hydrogen cyanide gas while the solution dried up spontaneously, and this gas diffused into the workshop.<BR>For sampling cyanides in the air, impinger should be used. The sampling ability of the sampling solution was closely related with its alkalinity. If the aqueous solution of sodium hydroxide is used as the sampling solution, the alkalinity of the solution should be more than 0.2 normal for long time bubbling and more than 0.02 normal for short time bubbling. During the bubbling procedure, the alkalinity of the sampling solution decreased gradually. And the solution should not be used for sampling cyanides if its alkalinity is less than 0.001 normal. If the alkalinity of the sampling solution is exhausted, this solution can not preserve the captured cyanides any more.

Journal

  • Sangyo Igaku

    Sangyo Igaku 15 (3), 245-249, 1973

    Japan Society for Occupational Health

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