Abstract：During the detection of mercury in silver concentrate by direct mercury analyzer, a large amount of sulfur will be released from sample at high temperature due to the high mass fraction of sulfur (up to 30% or higher), which accelerates the failure of catalytic tube. In order to solve this problem, sodium carbonate was used as sulfur-fixing agent for the determination of silver concentrate sample. It reduced the release of sulfur from samples, and realized determination of mercury in silver concentrate by direct mercury analyzer. The optimized experimental conditions were listed as follows: 0.10g of sample (passing through 150-mesh sieve) was weighed and transferred into sample boat; 0.20g of sodium carbonate was added; after stirring uniformly, the mixture was determined by a direct mercury analyzer; the decomposition temperature was 650℃ and the decomposition time was 15s. The determination coefficient of calibration curve (R2) were 0.9996 and 0.9993 when the content of mercury was in range of 2-20ng and 20-500ng, respectively. The limit of detection was 0.0012mg/kg. The content of mercury in three silver concentrate samples was determined according to the experimental method. The relative standard deviations (RSD, n=6) of determination results were between 2.8% and 6.1%. The recoveries were between 95% and 103%. The determination results were consistent with those obtained by atomic fluorescence spectrometry. The proposed method provided important technical support for the detection of mercury in silver concentrate and subsequent environmental impact assessment.
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