文在以丙酮氰醇代替氰化钾作掩蔽剂络合滴定铅黄铜中铅的基础上作了某些改进和补充:用镁盐代替EDTA-镁盐溶液,使终点更加明显,进行了铁、锑的干扰试验,在测定条件下毫克量的铜、镍、锌、锡和少量铁(0.2毫克)、锑(0.3毫克)不影响铅的络合滴定,扩大了应用范围。经分析多种牌号铜合金标 The article uses acetone cyanogen alcohol instead of potassium cyanide as a masking agent to titrate the lead in lead-brass based on some improvements and additions: magnesium salt instead of EDTA-magnesium salt solution, the end point is more obvious, the iron , Antimony interference test, the amount of milligram of copper, nickel, zinc, tin and a small amount of iron (0.2 mg) and antimony (0.3 mg) do not affect the complexometric titration of lead under the measuring conditions, thus expanding the application range. After analysis of a variety of grades of copper alloy standard