Ion Selective Electrode for Potentiometric Determination of Saccharin Using a Thin Film of Silsesquioxane 3-n-Propylpyridinium Chloride Polymer Coated-Graphite Rod
| Autor: | Rení Ventura da Silva Alfaya, Yoshitaka Gushikem, Susanne Rath, Antonio Alberto da Silva Alfaya, Felix Guillermo Reyes Reyes |
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| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Biochemistry (medical) Clinical Biochemistry Potentiometric titration Inorganic chemistry Polymer Biochemistry Chloride Silsesquioxane Analytical Chemistry Ion selective electrode chemistry.chemical_compound chemistry Electrode Electrochemistry Electroanalytical method medicine Saccharin Spectroscopy medicine.drug |
| Zdroj: | Analytical Letters. 33:2859-2871 |
| ISSN: | 1532-236X 0003-2719 |
| Popis: | A polymer coated graphite rod ion selective electrode for saccharin was constructed and evaluated for the determination of saccharin in artificial table top sweeteners. The polymer consists of a thin film of silsesquioxane 3-n-propylpyridinium chloride. The electrode response was based on the ion pair formed between saccharinate and the 3-n-propylpyridinium cation from the silsequioxane polymer. The electrode exhibits a Nernstian response for saccharin concentrations between 6.9×10-6 and 5.3×10-3 mol L-1 and a detection limit of 5.5×10-6 mol L-1. The electrode response for saccharin was fast (10-20 s) and the potential independent of pH in the range of 3 to 7. The selectivity coefficients K A, B pot for several anions usually present in commercial table top sweeteners were determined following the IUPAC recommendations. The potentiometric method with the ion selective electrode was validated by the HPLC reference method, through t8543226 determination of saccharin in commercial samples of table t... |
| Databáze: | OpenAIRE |
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