Flow injection potentiometric determination of saccharin in dietary products using a tubular ion-selective electrode

✍ Scribed by Orlando Fatibello-Filho; Clezio Aniceto

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 159 KB
• Volume: 11
• Category: Article
• ISSN: 0895-7533
• DOI: 10.1002/(sici)1098-2728(1999)11:4<234::aid-lra9>3.0.co;2-a

✦ Synopsis

The construction and analytical evaluation of a tubular ion-selective electrode coated with an ion pair formed between saccharinate anion and toluidine blue O cation incorporated on a poly(vinylchloride) (PVC) matrix was constructed and adapted in a flow-injection (FI) system. The optimum experimental conditions found were an analytical path of 120 cm, an injection sample volume of 500 lL, a pH of 2.5, a flow rate of 2.3 mL min ‫1מ‬ , and a tubular electrode length of 2.5 cm. The linear response to saccharin concentration ranged from 1.0 ‫ן‬ 10 ‫4מ‬ to 2.0 ‫ן‬ 10 ‫2מ‬ mol L ‫1מ‬ , with a slope of ‫1.35מ‬ ‫ע‬ 0.4 mV/decade and a detection limit of 8.0 ‫ן‬ 10 ‫5מ‬ mol L ‫1מ‬ . The analytical frequency was 40 determinations h ‫1מ‬ , and this system was used with success for saccharin determination in several dietary products.