电解银中银的测定,一直沿用氯化银比浊法,操作要求十分严格。我们用银-铜试剂铜置换光度法代替残银比浊,方法简单,容易掌握。对国标银(标值分别为99.972,99.985,99.991)的分析,结果符合很好。试剂铜试剂铜三氯甲烷溶液:制备同铜测定。为使铜试剂、铜等摩尔,萃取后的水相应保持铜的蓝色。贮于棕色磨口瓶中,使用时用三氯甲烷稀至吸光度约为0.5。氯化钠标准液:每升含20℃饱和氯化钠溶液17.30毫升(可视含量改变)。分析步骤称取试样、标准各1.00000克于100毫升烧杯中,加硝酸(1+1)10毫升,低温溶解,除尽氮氧化物,转 Electrolytic silver determination of silver, silver chloride turbidimetry has been followed, the operation requirements are very strict. We use the silver - copper reagent photolysis method instead of residual silver turbidity, the method is simple and easy to master. The analysis of GB silver (the standard values ​​are 99.972, 99.985, 99.991 respectively) is in good agreement. Reagents Copper reagents Copper trichloromethane solution: Preparation with copper determination. To make the copper reagent, copper equimolar, the extracted water should maintain the copper blue. Stored in a brown mill jar, the use of chloroform diluted to absorbance of about 0.5. Sodium chloride standard solution: 17.30 ml per liter of saturated sodium chloride solution containing 20 ° C (visual content change). Analysis step Weigh the sample, the standard 1.00000 grams in 100 ml beaker, add nitric acid (1 +1) 10 ml, dissolved in low temperature, remove the nitrogen oxides, turn