Abstract：After the development and utilization of sulfide deposits, the sulfide in the tailings will seriously harm the environment due to oxidation or acid corrosion. Therefore, it is of great significance to explore a suitable method for determination of sulfide in tailings. The low valent sulfur (S2-) in tailings reacted with hydrochloric acid at 220 ℃ for 2 h to generate hydrogen sulfide. The released hydrogen sulfide was absorbed with 40 mL of silver nitrate (30 g/L)-ammonia water (10%,V/V) solution to form silver sulfide precipitation. The precipitate was washed, filtered, dried and weighed to calculate the content of sulfide (in sulfur). The limit of detection and limit of quantification for this method were 0.009% and 0.03%, respectively. The contents of sulfide in certified reference materials of sphalerite and chalcopyrite as well as the quality control sample of tailings were determined according to the proposed method. The results were basically consistent with the certified values or reference values. The relative standard deviations(RSD,n=6) of the determination results were between 0.50% and 3.9%. 12 tailing samples with different contents of sulfide were determined parallelly for twice according to the proposed method. The relative deviations between the parallel samples were between 0 and 7.28%, which could meet the analysis requirements for the relative deviation of parallel double sample determination results in standard of HJ 833-2017.
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