Abstract：The silver in noble lead was enriched by cupellation method after lead brick was added into the sample in cupelling furnace at 900℃. The compsite granule was obtained after cupellation treatment. Then it was dissolved with nitric acid to obtain silver nitrate solution. Finally, the content of silver in silver nitrate solution was determined by sodium chloride potentiometric titration method. Consequently, a determination method of silver in noble lead by cupellation enrichment-sodium chloride potentiometric titration method was established. The experimental conditions for cupellation enrichment were investigated. The cupellation treatment by adding lead into sample was selected: the mass of sample and lead was 0.65g and 25g, respectively. The metallic silver with similar content of silver in sample was used for cupellation according to the same experimental method. The mass ratio of added silver to recovered silver was used as correction factor to correct the loss of silver in sample during cupellation treatment. The interference of coexisting impurity elements (lead, antimony, bismuth, copper, arsenic, tellurium, iron, nickel and palladium) in noble lead with determination was discussed. The results showed that the coexisting impurity elements in noble lead did not interfere with the determination. The experimental method was applied for determination of silver in noble lead actual samples. The relative standard deviations (RSD, n=8) of determination results were between 0.38% and 0.94%. The recoveries ranged from 99% to 101%. The results were consistent with those obtained by potassium thiocyanate potentiometric titration method .
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