Abstract：During the determination of lead in pure copper and copper alloy by flame atomic absorption spectrometry (FAAS), the separation enrichment method was usually adopted for the enrichment of lead, or the standard addition method was used to prepare calibration curve to eliminate the matrix effect. As a result, the operation was relatively complicated. The effect of copper matrix with different content on the determination of lead was investigated. The results showed that the influence of copper on the determination of lead could be basically ignored when the mass concentration of copper in solution was not more than 20mg/mL. However, the interference of copper with the determination of lead could not be ignored when the mass concentration of copper in solution was in range of 20-80mg/mL. Therefore, the calibration curve was directly prepared with standard solution series of lead for the sample with lead mass fraction not less than 0.05%. When the mass fraction of lead in sample was less than 0.05%, the high-purity copper without lead was used for matrix matching to prepare calibration curve to eliminate the matrix interference. Consequently, a determination of lead with mass concentration higher than 0.002% in pure copper and copper alloy by FAAS was established. The effect of acid medium and acidity on determination was investigated. Nitric acid (1+1) was finally selected to dissolve sample. According to various sample amounts and dilution factors, three types of serial standard solution were designed to prepare calibration curve. The concentration of acid in standard solution for preparation of calibration curve was the same to that in sample solution, thus avoiding the influence of acidity on determination. The experimental method was applied for determination of lead in certified reference materials of pure copper and copper alloy with mass fraction in range of 0.004%-2.7%. The results were basically consistent with the certified values. The relative standard deviations (RSD, n=7-9) of determination results were between 0.7% and 1.8%.
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