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Novel Flow‐through Potentiometric System for Dimethyamine Assessment Using New Ion Exchangers Doped‐polymeric Membrane Sensors
Electroanalysis ( IF 2.7 ) Pub Date : 2018-09-14 , DOI: 10.1002/elan.201800456
Saad S. M. Hassan 1 , Ayman H. Kamel 1 , Heba Abd El-Naby 1
Affiliation  

New simple potentiometric sensing systems are described for the sensitive and selective monitoring of dimethylamine (DMA). These systems are based on using polymeric membranes doped in some ion exchangers such as dimethylamine/phosphomolybdate [(CH3)2NH3]22+[MP]2− (Sensor I), dimethylamine/tetraphenylborate [(CH3)2NH3]+[TPB] (Sensor II) and dimethylamine/phosphotungstate [(CH3)2NH3]+[TP] (sensor III). All the sensing systems are incorporated in poly(vinyl chloride) matrix plasticized with o‐NPOE. In a Trizma buffer solution of pH 7.1, the sensors exhibit a stable, fast and linear response for 5.0×10−6–1.0×10−2, 2.5×10−5–1.0×10−2, and 5.0×10−6–1.0×10−2 mol L−1 DMA+ with slopes of 53.2±0.4, 49.4±0.6, and 53.8±0.3 mV decade−1, and detection limits of 2.0×10−6 (0.16 μg mL−1), 1.6×10−5(1.3 μg mL−1), and 1.4×10−6 (0.11 μg mL−1) mol L−1 for sensors (I), (II), and (III), respectively. Potentiometric selectivity measurements of these sensors reveal negligible interferences from most common aliphatic and aromatic amines. Satisfactory results are obtained with an average accuracy of 99.5 % and a mean precision of ±0.5 %. Validation of the proposed assay methods are examined by measuring the limit of detection, linearity range, accuracy, precision, within‐day repeatability, between‐days reproducibility and method ruggedness. Good performance characteristics and applicability of these sensors for DMA assessment in different matrices under static and hydrodynamic modes of measurements are demonstrated. The proposed sensors are also prepared in a tubular form and used as DMA detector in a two‐channel flow injection setup for continuous monitoring. The frequency rate is 27–53 samples h−1. The sensors are satisfactory applied for DMA quantification in both biological matrices and environmental samples with recoveries ranging between 95.0 and 104.0 %.

中文翻译:

使用新型离子交换剂掺杂的聚合物膜传感器对二甲胺进行评估的新型流通电位系统

描述了用于敏感和选择性监测二甲胺(DMA)的新的简单的电位传感系统。这些系统基于使用掺杂在某些离子交换剂中的聚合物膜,例如二甲胺/磷钼酸盐[(CH 32 NH 3 ] 2 2+ [MP] 2-(传感器I),二甲胺/四苯基硼酸盐[(CH 32 NH 3 ] + [TPB] -(传感器II)和二甲胺/磷钨酸盐[(CH 32 NH 3 ] + [TP] -(传感器III)。所有的传感系统都被并入了由o-NPOE增塑的聚氯乙烯基质中。在pH为7.1的的Trizma缓冲液中,传感器表现出稳定,快速和5.0×10线性响应-6 -1.0×10 -2,2.5×10 -5 -1.0×10 -2和5.0×10 -6 –1.0×10 -2  mol L -1 DMA +,斜率分别为53.2±0.4、49.4±0.6和53.8±0.3 mV十进位-1,检测限为2.0×10 -6(0.16μgmL -1),1.6 ×10 -5(1.3μgmL -1)和1.4×10 -6(0.11μgmL -1)摩尔L-1分别用于传感器(I),(II)和(III)。这些传感器的电位选择性测量表明,大多数常见的脂肪族和芳香族胺对干扰的影响可以忽略不计。获得了令人满意的结果,平均精度为99.5%,平均精度为±0.5%。通过测量检出限,线性范围,准确性,精密度,日内重复性,日间重现性和方法耐用性,来检验所提出测定方法的有效性。这些传感器具有良好的性能特征,并适用于在静态和流体动力测量模式下在不同矩阵中进行DMA评估。拟议中的传感器也准备成管状,并在连续监测的两通道流动注入装置中用作DMA检测器。频率为27–53个样本h-1。该传感器适用于生物基质和环境样品中的DMA定量分析,回收率在95.0%至104.0%之间。
更新日期:2018-09-14
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