Determination of tin in canned fruit juices by stripping potentiometry

The total tin concentration in five different kinds of canned fruit juices has been determined by using constant current stripping analysis on a gold film electrode, and potentiometric stripping analysis on a mercury film electrode, the concentration in the samples ranging between 40 and 80 mg l−1. The total time for one determination, including sample preparation, is approximately 10 min and the relative precision around 8%. The results obtained by the two electroanalytical techniques agreed satisfactorily with those results obtained by flame atomic absorption spectrophotometry.