Highly selective sulfate PVC-membrane electrode based on 2,5-diphenyl-1,2,4,5-tetraaza-bicyclo[2.2.1]heptane as a neutral carrier

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• 作者：Shamsipur ; Mojataba ; Yousefi ; Mohammad ; Ganjali ; Mohammad Reza ; Poursaberi ; Tahereh ; Faal-Rastgar ; Majid
• 关键词：Sulfate ion-selective electrode ; 2 ; 5-Diphenyl-1 ; 2 ; 4 ; 5-tetraaza-bicyclo[2.2.1]heptane ; PVC-membrane ; Potentiometry
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2002
• 出版时间：February 1, 2002
• 年：2002
• 卷：82
• 期：1
• 页码：105-110
• 全文大小：113 K

文摘

A sulfate-selective PVC-membrane sensor based on 2,5-diphenyl-1,2,4,5-tetraaza-bicyclo[2.2.1]heptane as a neutral carrier is presented. The potentiometric behavior of the electrode is closely dependent on the pH values in test solutions. The electrode revealed a linear response towards SO₄²⁻ ion in the range of 9.0×10⁻⁶ to 1.0×10⁻¹M with a slope of 28.8±0.2mV per decade at a pH of 4 (phosphate buffer). The electrode possesses a satisfactory reproducibility, a fast response time, a low limit of detection and, especially, an excellent discriminating ability for SO₄²⁻ ion with respect to many inorganic and organic anions. The electrode was used as an indicator electrode in potentiometric titration of sulfate and barium ions and in determination of zinc in zinc sulfate tablets.