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我厂生产用的锡青铜中含铜、铅、锌、锡总量在98.5%以上,杂质中镍、钴、锑、铋、锰、铁、硅等都在0.5%以下。部颁标准分析方法规定电解分离铜,并借以测定铜,电解后的溶液以极谱法测定铅和锌。由于分析方法需要贵重仪器设备,流程冗长,不能适应生产发展的需要,近年来,有些单位应用氰化物掩蔽铜、锌,以络黑T为指示剂,控制pH10的酸度络量法测定铅,然后用甲醛解蔽锌,络量法滴定锌。此法我们实践后,终点很难辨认,特别是使用大量的氰化物,既不安全,也不太方便。
The copper bronze used in the production of tin bronze in our factory contains more than 98.5% of total lead, zinc, and tin, and the contents of nickel, cobalt, antimony, bismuth, manganese, iron and silicon in impurities are all below 0.5%. The ministerial standard analytical method provides for the electrolytic separation of copper and the determination of copper and electrolyzed solutions for the determination of lead and zinc by polarography. In recent years, some units apply cyanide to mask copper and zinc, and use black chelate T as an indicator to control the pH 10 acidity volumetric method for the determination of lead. Then, the analytical method requires expensive instruments and equipment, the process is lengthy and can not meet the needs of production development. Zinc solution with formaldehyde, Volumetric titration of zinc. This method we practice, the end is difficult to identify, especially the use of large amounts of cyanide, neither safe nor too convenient.