Influence of decyl alcohol on the potentiometric behavior of three p-alkylbenzenesulfonate ion-selective electrodes

• Published in: Journal of colloid and interface science Vol. 288; no. 2; pp. 517 - 520
• Main Authors: Cabrera, Walton J., Urzúa, Marcela D., Ríos, Hernán E.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 15.08.2005; Elsevier
• Subjects: Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Interfering agents; Ion-selective electrodes; Membrane polarity; Membranes; Pearson soft and hard acids and bases; Pearson soft and hard acids and bases; Ion-selective electrodes; Interfering agents; Membrane polarity; Ion selective electrode; Acids; Alcohol; Membrane; Polarity
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2005.03.011

The influence of decyl alcohol on the potentiometric response of three para-alkylbenzenesulfonate ( p-RBS) electrodes is analyzed. The results are clearly dependent on the membrane surface polarity due to the presence of the alcohol. The ionophore was the complex trioctylmethylammonium– p-RBS, (TOMA +)– p-RBS −, with R = H , CH 3, and C 2H 5. The nature of the complex plays a fundamental role on the potentiometric behavior of the electrode showing that the more hydrophobic the complex, the better the potentiometric responses. Moreover, the electrodes selectivities for several hydrophilic and hydrophobic interfering anions were determined. The potentiometric results with interfering anions were coherent with the Pearson's hard and soft acid–base character of these anions.