锡铅基合金中铜的测定已有文献报道,通常有DDTC光度法测定高含量铜,准确度稍逊。电解重量法需要用昂贵的铂金电极,推广受到限制。采用日本工业标准JIS汇编中硫代硫酸钠滴定法测定铜时,发现锡基合金中当无一定量铅存在时,测得结果5。00％的铜偏低0.04％左右,当加入0.1g铅后,则可得到准确结果。主要试剂硝酸-溴混合溶液:向约25mL硝酸(1+1) Determination of copper in tin-lead-based alloys has been reported in the literature, usually DDTC photometric determination of high levels of copper, with less accuracy. Electrolyte gravimetric method requires expensive platinum electrodes, promotion is limited. Determination of copper using sodium thiosulfate titration method in Japanese Industrial Standard JIS compilation found that when a certain amount of lead is present in the tin-based alloy, the copper content of 5.00% is as low as 0.04% or so. When 0.1 g of lead After, you can get accurate results. The main reagent nitric acid - bromine mixed solution: to about 25mL nitric acid (1 +1)