Direct determination of aluminium in foods and pharmaceutical preparations by potentiometry using an AlMCM-41 modified polymeric membrane sensor
Direct determination of aluminium in foods and pharmaceutical preparations by potentiometry using an AlMCM-41 modified polymeric membrane sensor
复制标题
DOI：
10.1016/j.electacta.2010.06.083
复制
发表时间：
2010-09-30
影响因子：
6.6
通讯作者：
Zanjanchi, Mohammad A.
中科院分区：
文献类型：
--
作者：
Arvand, Majid;Kermanian, Maryam;Zanjanchi, Mohammad A.
报道了一种以AlMCM-41为中性载体，以聚氯乙烯(PVC)为基质的电位型铝敏元件。该传感器在1.0×10~(-7)~1.0×10~(-1)M浓度范围内，对Al~(3+)离子的选择性显著提高，检测下限为8.6×10~(-8)M，能斯特斜率为19.5+/-0.4 mV/十年活度。当聚氯乙烯用量为30%、苯乙酮用量为67%、离子载体用量为3%、四氢呋喃用量为2mL时，膜性能最佳。该方法响应速度快、稳定性好、重复性好、稳定性好。该传感器的响应时间接近10s，膜可以在3个月的时间内使用，没有任何明显的电位发散。选择性系数用匹配电位法(MPM)测定。基于AIMCM-41的传感器适用于pH 3-6的水溶液。测定了不同温度下的标准电极电势，并用于计算电极的等温系数。用于药品和食品中Al3+的测定。(C)2010爱思唯尔有限公司。保留所有权利。
A potentiometric aluminium sensor, based on the use AlMCM-41 as a neutral carrier, in poly(vinyl chloride) (PVC) matrix, is reported. The sensor exhibits significantly enhanced selectivity toward Al3+ ions over the concentration range 1.0 x 10(-7) to 1.0 x 10(-1) M with a detection limit of 8.6 x 10(-8) M and a Nernstian slope of 19.5 +/- 0.4 mV/decade of activity. The best performance was obtained with membrane composition 30% poly(vinyl chloride), 67% acetophenone, 3% ionophore and 2 mL tetrahydrofuran. Fast and stable response, good reproducibility and long-term stability are demonstrated. The response time of the sensor is similar to 10s and membrane could be used over a period of 3 months without any considerable divergence in potentials. Selectivity coefficients were determined by matched potential method (MPM). The AIMCM-41-based sensor is suitable for use in aqueous solution of pH 3-6. The standard electrode potentials were determined at different temperatures and used to calculate the isothermal coefficient of the electrode. It was used to determine Al3+ in drugs and food products. (C) 2010 Elsevier Ltd. All rights reserved.