一种具有电位阴离子响应的新型铀酰膜传感器。

A novel uranyl membrane sensor with potentiometric anionic response.

作者信息

Hassan Saad S M, Attawiya Amr M Y

机构信息

Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt.

出版信息

Talanta. 2006 Nov 15;70(4):883-9. doi: 10.1016/j.talanta.2006.02.005. Epub 2006 Mar 29.

DOI:10.1016/j.talanta.2006.02.005

PMID:18970854

Abstract

A novel potentiometric uranyl membrane sensor with a divalent anionic response is developed, characterized and used for determination of uranyl ion. The sensor incorporates triethylenetetramine (TETA) as an ionophore in poly(vinyl chloride) matrix membrane (PVC) plasticized with o-nitrophenyloctyl ether (o-NPOE). In strong sulphate test solutions, UO(2)(2+) ion forms a highly stable UO(2)(SO(4))(2) anion, extractable in TETA as {(2TETAH)(2+) UO(2)(SO(4))(2)} complex. Formation of the complex is confirmed and characterized by elemental analysis, mass spectrometry and infrared spectrometry. Sensor based on this system displays at pH 2.5-3.8 a linear response over the concentration range of 1.0x10(-1)-3.5x10(-5)moll(-1) uranium with a near-Nernstian calibration slope of -26.5+/-0.3mVdecade(-1). The lower limit of detection is approximately 5mugml(-1), the lifetime is 12 weeks and negligible interferences are caused by most common cations. Validation of the assay method reveals excellent performance characteristics in terms of sensitivity, selectivity, fast response and potential stability. The sensor is used for the determination of 0.01-7.09wt% uranium in naturally occurring and certified ore samples. The results show an average recovery of 97.6% and compare fairly well with data obtained using X-ray fluorescence technique.

摘要

开发了一种具有二价阴离子响应的新型电位铀酰膜传感器，对其进行了表征并用于测定铀酰离子。该传感器在以邻硝基苯基辛醚（o-NPOE）增塑的聚氯乙烯（PVC）基质膜中掺入三亚乙基四胺（TETA）作为离子载体。在强硫酸盐测试溶液中，UO(2)(2+)离子形成高度稳定的UO(2)(SO(4))(2)阴离子，可在TETA中以{(2TETAH)(2+) UO(2)(SO(4))(2)}络合物形式萃取。通过元素分析、质谱和红外光谱对络合物的形成进行了确认和表征。基于该系统的传感器在pH 2.5 - 3.8时，在1.0x10(-1)-3.5x10(-5)moll(-1)铀的浓度范围内呈现线性响应，校准斜率接近能斯特斜率，为-26.5±0.3mV/decade(-1)。检测下限约为5μg/ml，寿命为12周，大多数常见阳离子引起的干扰可忽略不计。该测定方法的验证表明，在灵敏度、选择性、快速响应和电位稳定性方面具有优异的性能特征。该传感器用于测定天然矿石样品和认证矿石样品中0.01 - 7.09wt%的铀。结果显示平均回收率为97.6%，与使用X射线荧光技术获得的数据相当。