シアンイオン希薄標準溶液の安定性の検討

概要

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The stability of dilute cyanide solutions was investigated. The potassium cyanide solutions of 1,10 and 1OOO μgCN-/ml were stored in glass, colored glass, polyethylene and Teflon bottles. The solutions of the same concentration of cyanide in 0.1 N sodium hydroxide were also stored in polyethylene and Teflon bottles. During the storage the conccntration of cyanide was determined for 1 and 1OμgCN-/ml by spectrophotometry with phenolphthalin and for 1OOOμgCN-/ml by argentimetry. About 20% of cyanide was lost from the solutions of 1 and 1OμgCN-/ml after 20 days in every bottles. However cyanide in the alkaline solutions of the same concentration degraduated in the same period only about 2% in Teflon bottle and about 1O% in polyethylene bottle. The loss of cyanide in the solution of 1000μgCN-/ml stored in polyethylene bottle, without alkali, was 2,8 and 21% for 20 days, 6 and 12 months, respectively, and was approximately the same as that in the alkaline solution. The addition of alkali and the use of polyethylene or Teflon or bottle seemed to be advisable, although their effectiveness has not been noticed for cyanide solution of higher concentration.
社団法人日本分析化学会の論文
1975-02-10