Abstract
The stability of dilute cyanide solutions was investigated. The potassium cyanide solutions of 1, 10 and 1000 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 concentration of cyanide was determined for 1 and 10μgCN-/ml by spectrophotometry with phenolphthalin and for 1000 μgCN-/ml by argentimetry.About 20% of cyanide was lost from the solutions of 1 and 10μgCN-/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 10% in polyethylene bottle. The loss of cyanide in the solution of 1000 μgCN-/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 bottle seemed to be advisable, although their effectiveness has not been noticed for cyanide solution of higher concentration.
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