Abstract：Mercury is one of the main harmful elements in copper concentrate. The accurate determination of mercury in copper concentrate is of great significance. In experiments, 0.10 g of sample was decomposed by oxygen bomb combustion using 0.50 g of benzoic acid as the accelerant. The volatilized mercury was absorbed with acid potassium permanganate solution and then determined by atomic fluorescence spectrometry. A method for the determination of mercury content in copper concentrate by oxygen bomb combustion decomposition and atomic fluorescence spectrometry(AFS) was established. Under the selected experimental conditions, the mass concentration of mercury in the range of 0-2.0 ng/mL had good linear relationship with the corresponding fluorescence intensity. The correlation coefficient was 0.999 9. The limit of detection of this method was 12 ng/g, and the limit of quantification was 40 ng/g. Three certified reference materials of copper concentrate with different contents of mercury were determined for seven times according to the experimental method. Meanwhile, the standard solution of mercury was added into sample for the standard addition recovery tests. The relative standard deviations (RSD, n=7) of determination results were between 2.1% and 5.8%. The recoveries were between 90% and 107%. Some copper concentrate samples from six regions, i.e., Chile, Australia, Mexico, Peru, Laos and Spain, were selected and compared respectively by the experimental method and the direct mercury measurement method of solid injection in national standard GB/T 3884.20-2018. The t test results showed that there was no significant statistical difference between the two methods.
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