China Nonferrous Metallurgy

Complex lead-containing samples from comprehensive recovery in pyrometallurgical copper smelting industry contain elements such as Ba, As, Sb, Sn and Bi. In the analysis of lead content, the elements are severely symbiotic and enwrapped due to interaction. The existing detection methods can not solve the problems of complete dissolution of lead and interference of various impurity elements at the same time. In this paper, the acid leaching-alkali fusion method was adopted to treat complex lead-containing samples. The lead leached by acid was measured by EDTA titration, and the lead dissolved by alkali fusion was measured by atomic absorption spectrometry. For acid-leaching solution, sulfuric acid was adopted for separating Ba, hydrogen bromide for removing As, Sb and Sn, and EDTA for Bi complexation, which eliminated the interference of various impurity elements on lead. The method was applied to the measurement of lead in Reference Material Lead Concentrates GBW(E)070173, and the relative error of the obtained result was less than 1%. The method is relatively easy and convenient in operation, with good reproducibility and high accuracy, which is of great reference for accurate measurement of lead in complex lead-containing samples.