用EDTA测定各种元素的容量法已进行了大量研究工作,锡的测定常用NH_4F析出法,铅锡连续测定、铋锡铅连续测定以及铟锡锌连续测定已有报导,但用EDTA连续测定铟、锡、铅尚未见有报导。本文提出在铟、锡、铅试液中,用酒石酸掩蔽锡,控制pH2.5与5,以二甲酚橙为指示剂,用EDTA分别滴定铟与铅;在另一份试液中,加入过量EDTA标准溶液,过量EDTA用铅标准溶液滴定测定铟、锡、铅合量,锡以差减法求得。本文准确,快速,适用于电子元件铟-锡-铅焊料中铟、锡、铅的测定。 A large number of studies have been conducted on the volumetric method for the determination of various elements by EDTA. The determination of tin has been reported by the NH_4F precipitation method, the continuous determination of lead and tin, the continuous determination of tin and lead, and the continuous determination of indium tin and zinc. However, , Tin, lead has not been reported. This paper proposed indium, tin, lead test solution, tin with tartaric acid masking, control pH2.5 and 5, using xylenol orange as an indicator, with EDTA were titrated indium and lead; in another test solution, add Excess EDTA standard solution, excessive EDTA titration with lead standard solution Determination of indium, tin, lead content, tin obtained by subtraction method. This paper is accurate and fast and suitable for the determination of indium, tin and lead in indium-tin-lead solders for electronic components.