Determination of Fluoride Ions in Mouthwash Samples by a PVC Membrane Samarium(III) Sensor

作者：Zamani Hassan Ali^*

来源：Analytical Letters, 2009, 42(3): 615-629.

DOI：10.1080/00032710802677142

• Ion-selective electrode
• potentiometry
• PVC membrane
• sensor

In this study, a new ion-selective electrode for Sm3 is described, illustrating 2-[(E)-1-(1H-pyrrol-2-yl)methylidene]-1-hydrazinecarbothioamide (PMH) in a poly(vinylchloride) (PVC) membrane with nitrobenzene (NB) as a plasticizer and sodium tetraphenyl borate (NaTPB) as an anionic additive. The proposed sensor exhibited a Nernstian response for Sm3 ions over a wide concentration range between 1.010-2 and 110-6 M, with a detection limit of 5.210-7 M in the pH range of 4.2-8.5. Moreover, the sensor displayed the Nernstian slope of 19.80.3mV per decade, having a fast response time within 10 s over the entire concentration range. This electrode presented very good selectivity and sensitivity toward the Sm3 ions over a wide variety of cations, including alkali, alkaline earth, transition-metal, and heavy-metal ions. It was used as an indicator electrode in the potentiometric titration of Sm3 ions with EDTA. The membrane sensor was also applied to the determination of fluoride ions in mouthwash samples.

• 出版日期2009