A new aluminum (III)-selective potentiometric sensor based on N,N '-propanediamide bis(2-salicylideneimine) as a neutral carrier

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

来源：Materials Science & Engineering C-Materials for Biological Applications, 2010, 30(1): 209-213.

DOI：10.1016/j.msec.2009.10.005

• Al(3+)
• Sensor
• Potentionnetric response characteristic
• Ion selective electrode
• N,N'-propanediamide
• bis(2-salicylideneimine)
• PVC membrane

This work describes the fabrication of a selective polymeric membrane potentiometric sensor for Al(3+) ion based on N,N'-propanediamide bis(2-salicylideneimine) (NPBS) as a neutral carrier. The proposed sensor, with optimum membrane composition, exhibited an excellent near-Nernstian response for Al(3+) ion ranging from 7.9 x 10(-7) to 1.0 x 10(-1) mol/L with a detection limit of 4.6 x 10(-7) mol/L and a slope of 19.4 +/- 0.3 mV/dec in pH 3.0 nitrate solution at 25 degrees C. It showed a relatively fast response time (8 s), suitable reproducibility and stability, and good selectivity towards Al(3+) ion. The operational pH range of the proposed sensor was 2.5-4.0. The response mechanism was discussed in view of UV-visible spectroscopy and the alternating current (AC) impedance technique. In addition, the proposed sensor was successfully used as an indicator electrode in potentiometric titration of Al(3+) ion and in the direct determination of Al(3+) ion in real samples.

• 出版日期2010-1-1
• 单位西南大学