[Determination of tin in canned foods with oscillographic polarography].

OBJECTIVE:To develop an oscillographic polarography method for determining the concentration of tin in canned foods. METHODS:Because the sensitive polarography wave of tin can be obtained in the system of H2SO4-KI-VitC- NH4VO3, the tin content of several canned foods was analyzed. RESULTS:The detection limit was 0.12 microgram/L. The calibration graph of Sn was linear from 0 to 2.0 micrograms/ml, and the relative standard deviation ranged from 4.22% to 8.33%. The recoveries were 94.7%-112.0%. The samples were analyzed by the proposed method and standard method. The results of the two methods agreed well. CONCLUSION:This method is simple, quick and almost free from interference, and it is available for use in analysis of the canned sample.