Abstract：In addition to main components such as silver, lead and sulfur, the silver concentrate was also associated with a variety of recyclable metal elements (such as tin, etc). Therefore, the accurate determination of tin content in silver concentrate was of great significance for improving the comprehensive utilization level of silver concentrate. The sample was decomposed by fusion with sodium peroxide after ignition. Then, the molten material was extracted by water. After acidification, the reduced iron powder was added into the test solution to reduce copper, antimony, bismuth and arsenic to elementary substance. Therefore, the separation of tin from these elements could be realized by filtration. Tin in the filtrate was reduced to divalent with aluminum sheet. Then the content of tin was determined by titration with potassium iodate standard solution using starch as the indicator. A determination method of tin in silver concentrate by potassium iodate titration was established. The sodium peroxide dosage, the iron powder dosage and reduction time were optimized. The interference tests showed that the coexisting impurity elements in silver concentrate had no influence on the determination. The content of tin in certified reference material of lead concentrate with similar composition to silver concentrate was determined according to the experimental method. The determination results were consistent with the certified values. The experimental method was also applied for determination of tin in four actual silver concentrate samples. The relative standard deviations (RSDs, n=8) of determination results were between 0.59% and 4.3%. The recoveries were between 98% and 104%. The proposed method was applied for the determination of tin in silver concentrate actual sample. The results were consistent with those obtained by beryllium coprecipitation separation-potassium iodate titration.
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