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过去我们曾用过铝-镍铬双金属电极以电位滴定法测定铜合金中的铝。今将该法略加修改应用于锌合铝的测定,亦得到了较满意的结果,并和容量法所测得的结果比较,结果一致。本法迅速,简便,适用于锌合金中铝的快速测定。分析方法:称取0.4000克样品于烧杯中,加盐酸(1:1)10毫升溶解。迅速过滤于300毫升烧杯中,用盐酸(1％)洗涤5—6次。滤液用氨水(比重0.9)中和至铝的沉淀不再溶解,立即滴加盐酸(6N)至沉淀完全溶解,并过量3毫升,以水稀释至80—100毫升,加入醋酸钠
In the past we have used aluminum - nickel-chromium bimetallic electrode potentiometric titration of aluminum in copper alloys. Now this method is slightly modified for the determination of zinc aluminum, have also been more satisfactory results, and compared with the volume method measured results, the results are consistent. This method is rapid and easy to apply to the rapid determination of aluminum in zinc alloy. Analysis: Weigh 0.4000 grams of sample in a beaker, add hydrochloric acid (1: 1) 10 ml dissolved. Quickly filter in a 300 ml beaker and wash 5-6 times with hydrochloric acid (1%). The filtrate was neutralized with ammonia (specific gravity 0.9) and the precipitate in aluminum no longer dissolved. Hydrochloric acid (6N) was immediately added dropwise until the precipitate was completely dissolved and an excess of 3 ml was diluted with water to 80-100 ml. Sodium acetate