一种基于用四丁基铵-斜发沸石纳米颗粒修饰的聚氯乙烯膜的草酸根选择性电极。
An oxalate selective electrode based on modified PVC-membrane with tetra-butylammonium--Clinoptilolite nanoparticles.
作者信息
Hoseini Zohre, Nezamzadeh-Ejhieh Alireza
机构信息
Department of Chemistry, Shahreza Branch, Islamic Azad University, P.O. Box 311-86145, Shahreza, Isfahan, Iran; Young Researchers and Elite Club, Shahreza Branch, Islamic Azad University, Shahreza, Iran.
Department of Chemistry, Shahreza Branch, Islamic Azad University, P.O. Box 311-86145, Shahreza, Isfahan, Iran; Young Researchers and Elite Club, Shahreza Branch, Islamic Azad University, Shahreza, Iran; Razi Chemistry Research Center (RCRC), Shahreza Branch, Islamic Azad University, Isfahan, Iran.
出版信息
Mater Sci Eng C Mater Biol Appl. 2016 Mar;60:119-125. doi: 10.1016/j.msec.2015.11.016. Epub 2015 Nov 10.
A modified PVC-membrane electrode with tetra-butylammonium bromide - Clinoptilolite nano-particles (TBA-NCP) showed good Nernstian slope (29.9±0.6 mV per decade of oxalate concentration) in concentration range of 3.1×10(-7)-8.3×10(-1) mol L(-1) with a detection limit of 1.5×10(-7) mol L(-1). The best performance was obtained with a membrane composition of 31.5% PVC, 62.5% DOP and 6% TBA-NCP in the temperature range of 20-35 °C and the pH range of 4-9. The fast response time and good reproducibility over a period of 3 months are other characteristics of the sensor. The proposed electrode was successfully used as an indicator electrode in titration of oxalate ions with CaCl2 solution. The proposed electrode was also used in direct potentiometric determination of oxalate in many real samples such as: mushroom, black and green tea, spinach and beet.
一种带有四丁基溴化铵 - 斜发沸石纳米颗粒（TBA - NCP）的改良聚氯乙烯膜电极，在3.1×10⁻⁷ - 8.3×10⁻¹ mol L⁻¹的浓度范围内表现出良好的能斯特斜率（草酸根浓度每变化十倍，斜率为29.9±0.6 mV），检测限为1.5×10⁻⁷ mol L⁻¹。在20 - 35 °C的温度范围和4 - 9的pH范围内，当膜组成为31.5%聚氯乙烯、62.5%邻苯二甲酸二辛酯和6% TBA - NCP时，可获得最佳性能。该传感器的其他特性包括响应时间快以及在3个月内具有良好的重现性。所提出的电极成功用作以氯化钙溶液滴定草酸根离子时的指示电极。所提出的电极还用于直接电位法测定许多实际样品中的草酸，如蘑菇、红茶和绿茶、菠菜和甜菜。
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