工場排水中の青酸イオンの現場試験法
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概要
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1) An apparatus for the field test of cyanide in industrial wastes was prepared by electric percholator for warmer and air pump for aeration. 2) Twenty ml. of sample is warmed to 65℃., and 10 ml. of 5% H_3PO_4 is added. After aeration for 15 min., cyanide gas is absorbed in 10 ml. of 1/30 N NaOH. Eighty to hundred per cent of cyanide is recovered by this procedure. 3) Adequate amounts of diphenylcarbazone-Hg (DC-Hg) reagent are added to CN absorbed alkaline solution. After 5 minutes, a little excess of DC-Hg reagent is filtered off, and developed colour intensity is determined. For the field test, artificial pigment is used for standard colour solutions which is made of auramine-p-rosaniline mixture. In the case of quantitative determination in laboratory, 18.46μg/ml. of diphenylcarbazone in 1/30 N NaOH is used for standard colour solution, which corresponds to 2.0 ppm. of CN, and the developed colour is determined spectrophotometrically at 490 mμ.
- 公益社団法人日本薬学会の論文
- 1967-08-30