Voltammetric copper(II) determination with a montmorillonite-modified carbon paste electrode

Abstract

The clay mineral montmorillonite has been tested as modifier for the carbon paste electrode with a novel electrode modification technique. The differential pulse voltammetric determination of copper(II) by means of this modified carbon paste electrode has been studied. A detection limit of 4x10(-8) mol/l has been achieved after 10 min preconcentration under open circuit conditions with subsequent anodic stripping voltammetry. The calibration curve for Cu(II) is linear in the range of 4x10(-8)-8x10(-7) mol/l. Pb interferes in a 10-fold molar and Cd and Hg in a 100-fold molar excess. The interference by humic ligands is significant.

Amine-intercalated montmorillonite matrices for enzyme immobilization and biosensing applications

“…1 Clay-modified electrodes has been applied to detect some analytes such as Pb 2+ , Fe 3+ , Cu 2+ , Hg 2+ , Ca 2+ , Ru(NH 3 ) 3+ , nitrophenol, ascorbic acid, dopamine and uric acid using differential pulse voltammetry (DPV), potentiometric ion sensitive electrode (PISE) and square wave voltammetry (SWV) methods. [17][18][19][20][21][22][23][24][25][26] Herein we described a simple and accurate electrochemical method using clay-modified glassy carbon electrodes. Methyl (M)-and dimethylamine (DA)-exchanged Mont was used as an immobilization matrix.…”

Sonoelectrochemical Detection of Copper Within Industrial Effluent: A Critical Assessment

“…The large overpotential required for hydrogen ion reduction at carbon substrates has undoubtedly contributed to the prevalence of this material and is particularly evident in those protocols that utilise bare electrodes (6,8,10,18,21). The significant proportion of systems utilising carbon paste (CPE) can be attributed to the ease with which modifiers such as ligands (9,16,(33)(34)(35)(36)(37) or ion exchangers (22,24) can be incorporated or blended within the electrode bulk. The significant proportion of systems utilising carbon paste (CPE) can be attributed to the ease with which modifiers such as ligands (9,16,(33)(34)(35)(36)(37) or ion exchangers (22,24) can be incorporated or blended within the electrode bulk.…”

Square-Wave Adsorptive Cathodic Stripping Voltammeteric Determination of Manganese (II) Using a Carbon Paste Electrode Modified with Montmorillonite Clay

“…Montmorillonite-Na clay has well-layered lattice structure, high chemical and mechanical stability, high cationic exchange capacity and strong adsorptive properties attributed to the expandability of its internal layers. Montmorillonite clay was used successfully as a modifier in carbon paste electrode for determination of each of Cu (II) [37], Au (III) [38,39], Hg (II) [40,41], Eu (III) [42] and Pb (II) [43]. It has been used also in this laboratory for determination of some pharmaceutical compounds [44,45] and for simultaneous determination of Cd (II), Pb (II), Cu (II) and Hg (II) [46].…”