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1.用氨羧络合齐Ⅲ作镍的电流滴定,在—1.2至—1.8伏特间进行滴定,再现性好,并且方法灵敏。镍的浓度在3×10~(-4)M 时,采用较稀的滴定剂,仍能得到满意的结果,也可应用于测定比较微量的镍。2.阳极泥中的 Ag~+离子及 Cu~(++)离子在测定过程起干扰作用。先用 AgCl 沉淀法分离 Ag~+离子;再用二乙醯二肟沉淀镍、比较大量的 Cu~(++)离子共存时,须进行二次的二乙醯二肟沉淀分离。3.应用本方法测定阳极泥中镍的含量,准确度达到重量法及二乙醯二肟电流滴定法的标准,而本方法有比较快速的优点。
1. Ammonia carboxylamine Qi together for nickel current titration, titration between -1.2 to -1.8 volts, good reproducibility, and the method is sensitive. Nickel concentration of 3 × 10 ~ (-4) M, the use of dilute titrant, still get satisfactory results, but also can be applied to the determination of a relatively small amount of nickel. Anode mud in the Ag ~ + ions and Cu ~ (++) ions interfere in the determination of the process. First, Ag ~ + ions were separated by AgCl precipitation method; then nickel was precipitated by diacetyldioxime. When a large amount of Cu ~ (+ +) ions coexist, they should be separated by secondary diacetyldioxime precipitation. 3. This method is used to determine the nickel content in the anode mud, the accuracy of gravimetric method and titanyl dioxime current titration standard, and the method has relatively fast advantages.