Abstract：After the sample was roasted in muffle furnace with furnace door was slightly opened, it was dissolved with hydrochloric acid and nitric acid-potassium chlorate. Gold in the sample was adsorbed with 0.2 g of polyurethane foam plastic which had been immersed in 10% (volume fraction,the below was the same) hydrochloric acid for 24 h. The polyurethane foam plastic was cleaned with water to remove the adsorbed ore pulp, and then directly digested with aqua regia-perchloric acid. Thus, a determination analysis method of gold in beneficiation process sample of copper was established by flame atomic absorption spectrometry(FAAS) after polyurethane foam plastic adsorption. The experimental results showed that carbon in high-carbon high-sulfur sample could be fully removed after roasting at 650 ℃ for 3.5 h with the furnace door slightly opened 4.0 mg of gold could be adsorbed completely with 0.2 g of polyurethane foam plastic which had been immersed in 10% hydrochloric acid for 24 h. The influence of ore pulp on adsorption rate could be basically eliminated by oscillation adsorption for 120 min. Under the selected experimental conditions, the mass concentration of gold in range of 0.020-1.0 μg/mL showed good linearity to its corresponding absorbance with correlation coefficient of 0.999 8. The detection limit of method was 0.024 μg/g. The proposed method was applied for the determination of gold in beneficiation process sample of copper (raw copper ore, copper concentrate and copper tailings). The results were consistent with those obtained by national standard methods (GB/T 3884.2-2012 or GB/T 20899-2007).The relative standard deviations (RSD, n=11) were not more than 10%.
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