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钢丝的黄铜镀层在氧化剂存在下,能与氨水生成四氨合铜(Ⅱ)和四氨合锌(Ⅱ),而铁则不参加反应。以硫酸酸化,参阅本刊(1981年第1期58页),用EDTA螯合滴定法测定其铜和锌的含量。试剂褪镀液:40克过硫酸铵于500毫升(1+9)的氨水中。六次甲基四胺:称40克于100毫升水中,加入浓盐酸10毫升。此时缓冲液pH≈5.2。分析步骤取钢丝数米(使褪镀下来的黄铜量在25mg以下),加褪镀液15至20ml,在不断摇动下浸褪1至1.5
Brass coating of steel wire can produce tetraammine copper (Ⅱ) and tetraammine zinc (Ⅱ) with ammonia in the presence of oxidant, while iron does not participate in the reaction. Acidification with sulfuric acid, see the publication (1981 first issue 58), with EDTA chelation titration determination of copper and zinc content. Reagent flotation solution: 40 g ammonium persulfate in 500 ml (1 + 9) ammonia. Hexamethylenetetramine: Weigh 40 g in 100 ml of water and add 10 ml of concentrated hydrochloric acid. At this point the buffer pH ~ 5.2. Analysis steps to take a few meters of wire (so that the amount of brass down plating 25mg), plus fade plating solution 15 to 20ml, constantly shaking dip 1 to 1.5