Abstract：The impurity contents of potassium and sodium in copper concentrate had an important influence on the copper smelting process. The sample was decomposed with hydrochloric acid-nitric acid-hydrofluoric acid-perchloric acid. The determination method of potassium and sodium in copper concentrate by flame atomic absorption spectrometry (FAAS) was established with air-acetylene flame. The determination medium was 5% hydrochloric acid. The determination wavelengths were 766.5 nm and 589.0 nm respectively for potassium and sodium. Under the selected experimental conditions, the mass concentration of potassium and sodium in range of 1.00-5.00 μg/L showed good linear relationship with the corresponding absorbance. The correlation coefficient was 0.999 8 and 0.999 9, respectively. The limit of detection of this method for potassium and sodium was 0.086 ng/mL and 0.056 μg/mL, respectively. The limit of quantification was 0.287 ng/mL and 0.187 ng/mL, respectively. The interference tests showed that the coexisting elements in sample had no interference with the determination of potassium and sodium. Three certified reference materials of copper concentrate for composition analysis were determined for 11 times according to the experimental method. The relative errors between the results and certified values were -7.69%-5.40%, and the relative standard deviations (RSDs, n=11) were 0.44%-3.7%. The proposed method was applied for the determination of potassium and sodium in copper concentrate sample. The RSDs (n=11) of determination results were 0.55%-2.4%, and the recoveries were 96%-105%.
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