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SIMPLE ANALYZING METHOD FOR CYAN IN PROCESS WASTE WATER AND WASTE WATER-TREATING METHOD USING THE METHOD
SIMPLE ANALYZING METHOD FOR CYAN IN PROCESS WASTE WATER AND WASTE WATER-TREATING METHOD USING THE METHOD
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机译：工艺废水中青色的简单分析方法及使用该方法的废水处理方法
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摘要
PROBLEM TO BE SOLVED: To simply and correctly measure a concentration of cyan, by collecting a sample waste water in a flask, adding zeolite, sulfuric acid, hydroxylamine hydrochloride solution, etc., to the sample waste water, heating the sample waste water and making generated vapor come in direct touch with a color-producing liquid. ;SOLUTION: A rubber plug with a U-tube is set to an Erlenmeyer flask (distillation vessel) of, for example, 100ml capacity, and the U-tube is inserted in a test tube (color- producing container) while one side of the U-tube is arranged as a blow tube. Approximately 50ml of a sample solution (waste water) including cyan is collected in the flask, to which sulfuric acid solution and 5% hydroxylamine hydrochloride solution, 10% EDTA solution and zeolite are added. The flask is then heated until a fraction after boiling is about 10ml. The vapor generated by the heating is sent through the blow tube into the color-producing container to which 500mg picric acid-coloring reagent and 1ml water are added, whereby the vapor is brought in touch with a color- producing liquid. The color-producing amount is compared with a color sample, so that a concentration of cyan in the sample solution is detected. In this manner, the unnecessary excessive consumption of sodium hypochlorite is prevented.;COPYRIGHT: (C)1997,JPO
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