铜标准溶液的配制、金属铜标定硫代硫酸钠标准溶液和电解铜电解重量分析等,均采用硝酸溶解金属铜。实践证明,由于溶解条件不一,往往引起部分铜的损失而导致结果不稳定,重现性较差。但是,造成这种现象的原因并未引起分析工作者的足够重视, Preparation of copper standard solution, the standard calibration of copper and sodium thiosulfate electrolytic copper electrolytic weight analysis, etc., are dissolved in nitric acid copper. Practice has proved that due to the dissolution of different conditions, often lead to part of the loss of copper and lead to unstable results, poor reproducibility. However, the reasons for this phenomenon did not attract enough attention from analysts,