试样以盐酸、过氧化氢溶解,加氢氧化钠调至强碱性。以联胺为还原剂,将铜(Ⅱ),镍(Ⅱ)还原为金属,锌、铅、锡等两性元素留在溶液中。金属铜、镍之沉淀质密,易于沉降,不吸附包翩其它组分,可不经过滤,直接吸取上层清液定锌。分析程序称取试样0.5000克,于200ml两用瓶中,加浓盐酸5ml,过氧化氢2ml,加热使试样分解,煮沸分解过量之过氧化氢。冷却后加乙二胺1ml,硫酸联胺固体1克,氢氧化钠溶液(50%)15ml,煮沸数分钟(注1),加水约60ml,煮沸1分钟,冷却,以水稀释至刻度,静置。(注2)吸取上层清液50ml,置于300ml,三 Sample to hydrochloric acid, hydrogen peroxide dissolved, add sodium hydroxide adjusted to strong alkaline. With hydrazine as reducing agent, copper (Ⅱ) and nickel (Ⅱ) are reduced to metal, and zinc, lead and tin are left in solution. Metallic copper, nickel precipitation quality, easy to settle, does not absorb the package Pina other components, without filtration, directly draw the supernatant liquid zinc. Analysis program Weigh 0.5000 grams of sample, in 200ml dual-use bottle, add concentrated hydrochloric acid 5ml, hydrogen peroxide 2ml, heating the sample decomposition, boil over hydrogen peroxide decomposition. After cooling, add 1 ml of ethylenediamine, 1 g of hydrazine sulfate solid, 15 ml of sodium hydroxide solution (50%), boil for several minutes (Note 1), add about 60 ml of water, boil for 1 minute, cool, dilute with water to the mark Set. (Note 2) Suction supernatant 50ml, placed 300ml, three