Modified solid electrodes for stripping voltammetric determination of tin |
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Authors: | C Faller G Henze N Stojko S Saraeva and K Brainina |
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Institution: | (1) Fachbereich Chemie der Universit?t Kaiserslautern, Abteilung Anorganische und Analytische Chemie der Universit?t Trier, Postfach 3825, D-54228 Trier, Germany, DE;(2) Ural State Economic University, 8th of March Street 62, 620219 Ekaterinburg, Russia, RU |
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Abstract: | The paper describes the determination of tin by ASV using modified thick film electrodes. Three different types of electrodes
were developed: One modified with a mixture of Nafion and mercury(II)acetate, one modified with diethyldithiocarbamate (DDC)
or pyrrolidinedithiocarbamate (PDC) and mercury(II)acetate, and one modified with calomel. The analyte was accumulated on
the electrode surface after special electrochemical pretreatment of the modified electrode. After recording the voltammogram
the electrodes were electrochemically regenerated. By virtue of their lifetime and their measurement reproducibility, we preferred
the DDC and PDC modified electrodes. They can be used for months without changing their chemical characteristics. The linear
range for tin determination with these electrodes is between 1 and 100 μg/L; the detection limit was calculated as 0.9 μg/L.
The electrodes were applied to the direct determination of tin in different canned fruit juices without special sample pretreatment.
Received: 20 December 1996 / Revised: 11 March 1997 / Accepted: 13 March 1997 |
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