Abstract：Certain amount of gold-loaded carbon was sampled for fire assay tests. The gold-silver composite particles were obtained after smelting and cupellation. The gold particles were then obtained by decomposition with nitric acid. Thus the content of silver in gold-loaded carbon could be calculated. The determination method of silver in gold-loaded carbon by fire assay gravimetry was established. The optimum experimental conditions were investigated, including the sample amount in fire assay, the dosage of lead oxide and the cupellation temperature. According to the current situation of domestic gold-loaded carbon production, some coexisting elements were added into certified reference materials of gold-loaded carbon for the interference tests. The results showed that the coexisting elements (Cu, Fe, Pb, Cd, Zn, Bi, Cr, Ca, Mg and As) in gold-loaded carbon had no influence on the determination of silver. The proposed method was applied to the determination of silver in three certified reference materials of gold-loaded carbon. The found results were basically consistent with the certified values. The relative standard deviations (RSD, n=11) were between 0.82% and 4.2%.
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