铜合金中锌的测定,过去我们常用重量法和氰化物掩蔽、甲醛解蔽的络合滴定法。但由于重量法需两次过滤,手续烦琐,不能满足生产上的要求;而容量法要用剧毒的氰化物,并且甲醛解蔽时终点不易掌握;而有些铜合金在加掩蔽剂氟化氢铵时,溶液变浑浊,使测定无法进行。我们对铜合金中锌的络合滴定进行了试验,采用了硫代硫酸钠作掩蔽剂,并对含镍样品,以丁二肟沉淀法,消除镍对指示剂封闭的影响。使改进后的方法能满足生产上 Determination of zinc in copper alloys, in the past we used the weight method and cyanide masking, formaldehyde decontamination complexometric titration. However, since the gravimetric method needs to be filtered twice, the procedures are cumbersome and can not meet the requirements of production. However, the volumetric method uses highly toxic cyanide and the end point of formaldehyde extraction is not easy to grasp; while in some copper alloys, The solution becomes cloudy, making the assay inoperable. We tested the complexation titration of zinc in copper alloy by using sodium thiosulfate as a masking agent and the influence of nickel on the indicator blocking by nickel dioxime precipitation method. So that improved methods to meet the production