Voltammetric copper(II) determination with a montmorillonite-modified carbon paste electrode.
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.
Kula
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Institute of Geonics, Academy of Sciences of Czech Republic, Studertská 1768, 70800, Ostrava, Czech Republic.
Navrátilová
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