Maghear Adela, Tertiş Mihaela, Fritea Luminţa, Marian Iuliu O, Indrea Emil, Walcarius Alain, Săndulescu Robert
Analytical Chemistry Department, Faculty of Pharmacy, "Iuliu Haţieganu" University of Medicine and Pharmacy, 4 Louis Pasteur Street, 400349 Cluj-Napoca, Romania; Laboratoire de Chimie Physique et Microbiologie pour l׳Environnement, UMR 7564, CNRS - Université de Lorraine, 405 rue de Vandoeuvre, F-54600 Villers-lès-Nancy, France.
Analytical Chemistry Department, Faculty of Pharmacy, "Iuliu Haţieganu" University of Medicine and Pharmacy, 4 Louis Pasteur Street, 400349 Cluj-Napoca, Romania; "Babeş-Bolyai" University, Faculty of Chemistry and Chemical Engineering, 11 Arany Janos Street, 400028 Cluj-Napoca, Romania.
Talanta. 2014 Jul;125:36-44. doi: 10.1016/j.talanta.2014.02.042. Epub 2014 Feb 27.
This work describes the preparation and characterization of smectite clay partially exchanged with tetrabutylammonium ions (TBA(+)) and its subsequent deposition onto glassy carbon electrode (GCE) for application to the preconcentration electroanalysis of metal ions (Cd, Pb, and Cu). Such partial exchange of TBA(+) induces the expansion of the interlayer region between the clay sheets (as ascertained by XRD) while maintaining its ion exchange capacity, which resulted in enhanced mass transport rates (as pointed out by electrochemical monitoring of permeability properties of these thin (organo)clay films on GCE). This principle was applied here to the anodic stripping square wave voltammetric analysis of metal ions after accumulation at open circuit. Among others, detection limits as low as 3.6×10(-8)M for copper and 7.2×10(-8)M for cadmium have been achieved.
这项工作描述了用四丁基铵离子（TBA(+)）部分交换的蒙脱石粘土的制备与表征，以及随后将其沉积到玻碳电极（GCE）上，用于金属离子（镉、铅和铜）的预富集电分析。TBA(+)的这种部分交换会导致粘土层间区域膨胀（通过XRD确定），同时保持其离子交换能力，这使得传质速率提高（通过对这些在GCE上的薄（有机）粘土膜的渗透性进行电化学监测指出）。这一原理在此应用于开路富集后金属离子的阳极溶出方波伏安分析。其中，铜的检测限低至3.6×10(-8)M，镉的检测限低至7.2×10(-8)M。
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