Abstract：The reported determination method of high content cadmium in tin-lead solder by EDTA complexometric titration was modified. The determination precision of cadmium in tin-lead solder by EDTA complexometric titration was improved by increasing sample mass to 1.50 g and using hexamethylenetetramine buffer solution (pH=6.00±0.02) to replace acetic acid-sodium acetate buffer solution. Meanwhile, the EDTA standard titration solution was calibrated using lead standard solution instead of cadmium standard solution, avoiding the rigid phenomenon of indicator. The tin-lead solder sample was dissolved with tartaric acid, nitric acid and hydrochloric acid. The impurity elements such as tin, antimony and bismuth were masked by tartaric acid complexation. In hexamethylenetetramine buffer solution system at pH 6.00, the total content of lead and cadmium was firstly titrated by EDTA standard titration solution using xylenol orange as indicator. Then cadmium was masked with sodium potassium tartrate and phenanthroline. After determining the content of lead using EDTA titration solution, the content of cadmium could be calculated through subtraction method. The interference tests indicated that the impurity elements in tin-lead solder sample had no interference with the determination. The proposed method was applied for the determination of cadmium in tin-lead solder sample with mass fraction in range of 10.00%-20.00%. The found results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES). The relative standard deviations (RSD, n=11) were between 0.28% and 0.87%.
石如祥,张丽,陈树莲. EDTA滴定法测定锡铅焊料中高含量镉[J]. 冶金分析, 2017, 37(10): 79-83.
SHI Ru-xiang,ZHANG Li,CHEN Shu-lian. Determination of high content cadmium in tin-lead solder by EDTA titration. , 2017, 37(10): 79-83.
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