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本文报告用硫化银膜电极指示,Gran作图法测定水样中的CN~-。取90毫升水样,加入1毫升0.1M EDTA,7毫升14.4％KNO_3,1毫升1 MNaOH和1毫升银氰指示剂(10~(-3)M KCN以10~(-2)M AgNO_3滴定到等当点所需体积的99％配成)。浸入电极,搅动下根据电位值加入适当浓度的氰标准溶液,每次0.5毫升。搅动2—3分钟后读取平衡电位值。如此操作4—5次,同时作空白校正。在Gran作图纸上作图,按下式求出试样中CN~-的浓度Cx:
In this paper, we report the determination of CN ~ - in water samples with Granulography using silver sulphide membrane electrode. Take a sample of 90 ml of water and titrate with 1 ml of 0.1 M EDTA, 7 ml of 14.4% KNO 3, 1 ml of 1 M NaOH and 1 ml of silver cyanide indicator (10 -3 M KCN) with 10 -2 M AgNO 3 Equivalent 99% of the required volume dubbed). Immersed in the electrode, stirring according to the potential value of the appropriate concentration of cyanogen standard solution, each 0.5 ml. After 2-3 minutes of stirring, read the equilibrium potential value. This operation 4-5 times, while making a blank correction. Draw a chart on a Gran chart and find the concentration of CN in the test sample as follows: Cx: