Abstract
Abstract A combined β-diketo liquid chelating exchanger, LCE (RCOCH2COCF3; R = C9H19), separation followed by flame atomic absorption spectrometry method is described for the determinatoin of tin in canned foods. the optimum conditions for the separation and preconcentration of tin e.g., pH, solvent, exchanger concentration, time, effect of various ions and nature of the extracted species have been discussed. Quantitative extraction (100%) of tin with LCE occurs in cyclohexane medium at pH 5.8, the extracted species being . The results of the determination of tin in five canned food samples were as follows (in mg/kg): orange juice, 97.31 ± 0.71; pineapple juice; 145.85 ± 0.59; tomato juice, 70.54 ± 0.91; chicken soup, 21.30 ± 0.65; Vegetable soup, 65.24 ± 0.93. the reliability of the present method has been tested from the recoveries (98.4-101.7%) of tin after adding various known amounts to pineapple juice and vegetable soup solutions.
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