Abstract
A sensitive determination method of tin by differential pulse polarography is described. Addition of tropolone to acetate supporting electrolyte at about pH 4.7 provides a 30-fold signal enhancement, giving a sensitivity comparable to that obtained in anodic stripping voltammetry, but without the need for enrichment by pre-electrolysis. The response is linear over more than three orders of magnitude (1 ng ml −1−5 μg ml −1 Sn), allowing measurements within a wide concentration range without changes in sample preparation or measuring conditions. Large amuonts of Ti, W, Cr or Mo interfere, but can be removed completely by pre-separation of tin based on extraction with tropolone/toluene and back-extraction into the supporting electrolyte. Results for tin in water and fruit juice are consistent with those obtained by other techniques.
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