A highly selective polymeric membrane barium(II) electrode based on a macrocyclic tetrabasic ligand as neutral carrier

作者：Ma Yu Hua; Yuan Ruo^*; Chai Ya Qin; Liu Xin Lu

来源：Analytical and Bioanalytical Chemistry, 2009, 395(3): 855-862.

DOI：10.1007/s00216-009-3029-9

• Barium(II) ion-selective electrode
• Polymeric membrane
• Macrocyclic tetrabasic ligand
• Potential response characteristic
• Chemical sensors
• Ion-selective electrodes
• Potentiometry/titrations

A novel barium(II) ion-selective polymeric membrane electrode based on a macrocyclic tetrabasic ligand that derived from the reaction of 4,6-diacetylresorcinol and ethylenediamine in the molar ratio 1:1 as neutral carrier was described. The electrode, with optimum membrane composition, exhibited an excellent near-Nernstian response for Ba(2 ) ion ranging from 3.6 x 10(-6) to 1.0 x 10(-1) mol/L with a detection limit of 1.9 x 10(-6) mol/L and a slope of 29.7 /- 0.2 mV/dec in pH 4.0 nitrate buffer solution at 25 degrees C. It had a relatively fast response time (10 s), good selectivity towards Ba(2 ) ion, and could be used over a wide pH range of 2.5-7.5. Then, the response mechanism was discussed in view of UV-visible spectroscopy and the A. C. impedance technique. Finally, the proposed electrode was successfully applied to the detection of Ba(2 ) ions in real samples as well as in sulfate(II) ions in water.

• 出版日期2009-10
• 单位西南大学