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在一份试液中,络合滴定铜、锌总量;在另一份试液中,络合滴定锌(铜用抗坏血酸掩蔽)。本法适用于各种黄铜电镀液的分析。操作: 用吸量管吸取3.0毫升黄铜电镀液2份,分别置于250毫升烧杯中。于通风厨中,各自加5毫升硫酸(1:2)和几滴浓硝酸。加热并摇晃烧杯直到沉淀溶解。继续加热至冒白烟,冷却,小心加入150毫升水。加入浓氨
In a test solution, complex titration of copper, zinc total; in another test solution, complex titration zinc (copper masked with ascorbic acid). This law applies to all kinds of brass plating solution analysis. Operation: Pipette 3.0 ml of brass plating solution into two pipettes and place them in a 250 ml beaker. Add 5 ml sulfuric acid (1: 2) and a few drops of concentrated nitric acid to each of the ventilated chefs. Heat and shake the beaker until the precipitate has dissolved. Continue heating to white smoke, cool, and carefully add 150 ml of water. Add concentrated ammonia