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首页> 外文期刊>Electroanalysis >Novel Thorium Membrane Sensors with Anionic Response Based on Trioctylphosphine Oxide and Toluate Ionophores
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Novel Thorium Membrane Sensors with Anionic Response Based on Trioctylphosphine Oxide and Toluate Ionophores

机译：基于三辛基氧化膦和甲苯甲酸离子载体的具有阴离子响应的新型Thor膜传感器

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摘要

Two novel potentiometric polymeric membrane sensors for rapid and accurate determination of thorium are described. These are based on the use of trioctylphosphine oxide (TOPO) and thorium toluate (Th-TA) as ionophores dispersed in poly(vinyl chloride) matrix membranes plasticized with nitrophenyloctyl ether. In strong nitric acid medium, Th(IV) nitrate is converted into [Th(NO3)(6)](2-) complex and sensed as anionic divalent ion which exclude most cationic effect. Validation of the assay methods using the quality assurance standards (linearity range, accuracy, precision, within-day variability, between-day-repeatability, lower detection limit and sensitivity) reveals excellent performance characteristics of both sensors. The sensors exhibit near-Nernstian response for 1.0 x 10(-6) -1.0 X 10(-1) M Th over the pH range 2.5 - 4.5. Calibration slopes of - 32.3 +/- 0.3 and - 27.2 +/- 0.2 mV/decade, precision of +/- 0.5 and +/- 0.8% and accuracy of 98.8 +/- 0.9 and 97.9 +/- 0.7% are obtained with TOPO and Th-TA based sensors, respectively. Negligible interferences are caused by most interfering mono-, di-, tri-, tetra-, penta-, and hexa-valent elements commonly associated with thorium in naturally occurring minerals and ores. High concentrations of Cl-, F-, SO42-, and NO3- ions have no diverse effect. Complete removal of the effect of the interferents in complex matrices is achieved by retention of [Th(NO3)(6)](2-) complex from 5 M nitric acid/methanol mixture (1: 9 v/v) on a strong anion exchanger, washing out the cationic interferents followed by stripping off thorium anion complex and measurements. Both sensors are used for determining thorium in certified thorium ore samples (20 - 120 mg Th/kg) and some naturally occurring ores (200-600 mg Th/kg). ne results obtained agree fairly well with the certified labeled values or the data obtained using X-ray fluorescence spectrometry
机译：描述了两种新颖的电位计聚合物膜传感器，用于快速，准确地测定determination。这些是基于使用三辛基氧化膦（TOPO）和甲苯甲酸th（Th-TA）作为分散在用硝基苯基辛基醚增塑的聚（氯乙烯）基质膜中的离子载体。在强硝酸介质中，硝酸Th（IV）转化为[Th（NO3）（6）]（2-）络合物，并被感知为阴离子二价离子，但大部分阳离子作用都被排除在外。使用质量保证标准（线性范围，准确性，精密度，日内变异性，日间重复性，较低的检测限和灵敏度）对测定方法的验证揭示了这两种传感器的出色性能特征。在2.5-4.5的pH范围内，传感器对1.0 x 10（-6）-1.0 X 10（-1）M Th具有近能斯特响应。校准斜率为-32.3 +/- 0.3和-27.2 +/- 0.2 mV /十倍，精度为+/- 0.5和+/- 0.8％，精度为98.8 +/- 0.9和97.9 +/- 0.7％分别基于TOPO和Th-TA的传感器。可以忽略不计的干扰是由天然存在的矿物和矿石中通常与th有关的大多数干扰单价，二价，三价，四价，五价和六价元素引起的。高浓度的Cl-，F-，SO42-和NO3-离子没有多种作用。通过从强阴离子上保留5 M硝酸/甲醇混合物（1：9 v / v）中的[Th（NO3）（6）]（2-）络合物，可以完全消除复杂基质中干扰物的影响。交换器，洗净阳离子干扰物，然后剥离or阴离子络合物并进行测量。两种传感器均用于确定认证certified矿石样品（20-120 mg Th / kg）和一些天然矿石（200-600 mg Th / kg）中的th。获得的结果与认证的标记值或使用X射线荧光光谱法获得的数据非常吻合

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