Abstract：The contents of potassium and sodium impurities in aluminum nitride powder had an important effect on the thermal conductivity of aluminum nitride ceramic products. Aluminum nitride could not be dissolved under normal temperature and pressure, and the alkali fusion method was not suitable for the analysis of potassium and sodium. The aluminum nitride samples were decomposed with hydrochloric acid by microwave digestion in experiments. Then the contents of potassium and sodium were determined by flame atomic absorption spectrometry (FAAS) at 766.5nm and 589.0nm, respectively. The determination method of potassium and sodium in aluminum nitride powder by microwave digestion-flame atomic absorption spectrometry was established. The effects of aluminum matrix and coexisting elements on the determination of potassium and sodium were studied. The microwave digestion conditions, acidity and the dosage of deionizer were optimized. The linear correlation coefficient of calibration curve for potassium and sodium was 0.9999 and 1.000, respectively. The characteristic concentration was 0.026μg/mL for potassium and 0.015μg/mL for sodium, respectively. The limit of detection was 0.7μg/g and 0.5μg/g for potassium and sodium, respectively. The contents of potassium and sodium in aluminum nitride powder sample were determined according to the experimental method. The relative standard deviations (RSD, n=7) of potassium and sodium were both less than 4%. The spiked recovery was 103% and 98%, respectively. The found results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES). The influence of matrix effect on the determination was effectively solved by matrix matching with high purity aluminum. The proposed method was applicable for the analysis of potassium and sodium in aluminum nitride powder with purity higher than 99.9%.
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