Abstract：The accurate determination of mercury content in copper concentrate is of great significance to the prevention and control of mercury pollution in copper smelting. Since copper concentrate is rich in sulfur, if the content of mercury is measured by direct mercury analyzer, the sulfur in sample can react with the catalyst, which will accelerate the failure of the catalytic tube and shorten its service life. In this study, 0.10 g of sample was mixed with 0.2 g of sodium carbonate as the purification agent. Then the surface of sample was uniformly covered with 0.01 g of sodium carbonate. The mixture was decomposed at 750 ℃ for 90 s. The sulfur in sample could react with sodium carbonate to form sulfate with better thermal stability. Therefore, the determination of mercury in copper concentrate by direct mercury analyzer was realized. At the same time, the service life of the catalytic tube was also effectively prolonged. The measurement ranges of mercury mass in the calibration curves of low and high absorption cells were 2-18 ng and 18-1 300 ng, and the determination coefficients were 0.999 9 and 0.999 7, respectively. The limit of detection of the method was 0.002 1 mg/kg, and the measurement range was 0.008 1-13 mg/kg. Three copper concentrate samples were determined according to the experimental method, the solid sample direct mercury analysis method in standard GB/T 3884.20-2018 and atomic fluorescence spectrometry in standard SN/T 4364-2015. It was found that the determination results of three methods were basically consistent. The relative standard deviations (RSD, n=11) of the experimental results were 1.9%-2.7%, and the spiked recoveries were 95%-104%. A large number of test results showed that the use times of catalytic tube could be consistent with that of sulfur free sample after adding sodium carbonate as purification agent followed by direct mercury analyzer.
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