Interference by tin in AOAC dry-ash voltammetric method for determination of lead and cadmium in canned foods.
When lead and cadmium were determined in samples of canned food by the AOAC anodic stripping voltammetric method, an interference was observed which was believed to be tin(IV). This interference could cause false positive results for lead and cadmium. The electroactivity of tin(IV) was suppressed by increasing the concentration of tartaric acid in the supporting electrolyte from 0.005M to 0.1M after mixing with an equal volume of sample solution.
Food and Drug Administration, New York Regional Laboratory, Brooklyn 11232-1593.
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D002104:Cadmium / Q000032:analysis*; D004563:Electrochemistry; D004573:Electrolytes / Q000032:analysis; D005504:Food Analysis; D005519:Food Preservation; D007202:Indicators and Reagents; D007854:Lead / Q000032:analysis*; D010084:Oxidation-Reduction; D013644:Tartrates / Q000032:analysis; D014001:Tin / Q000032:analysis*
D004573:Electrolytes; D007202:Indicators and Reagents; D013644:Tartrates; D002104:Cadmium; D007854:Lead; D014001:Tin