Development of a novel carbon paste electrode containing a natural zeolite for the voltammetric determination of copper

Natural zeolite modified carbon paste electrode (NZMCPE) was developed for the voltammetric determination of Cu (II). Copper (II) was selectively preconcentrated, at open circuit, on the NZMCPE. The measurements were carried out by using differential pulse cathodic stripping voltammetry. Linear response to copper (II) was found in the 5.0 × 10-8 - 5.0 × 10-6 M (r: 0.9990) concentration range, with a detection limit estimated at 1.5 × 10-8 M. The multiple determinations (n = 6), following a preconcentration detection-regeneration cycle, shown a relative standard deviation of 2.22% at Cu (II) concentration of 2.0 × 10 -6 M. The developed method was also applied to the determination of copper in two model solutions and two real samples. © 2004 Elsevier B.V. All rights reserved.KB.FEN.078 100Y009 2001/FEN/025We thank Dr. Walcarius for his valuable support and helpful comments on this work. We thank Dr. Senol Alpat and Dr. Nil Ertas for precious contributions. We also express our gratitude to the Scientific and Technical Research Council of Turkey (Contract No.: 100Y009), to Dokuz Eylul University Research Fund (Contract No.: 02.KB.FEN.078) and Ege University Research Fund (Contract No.: 2001/FEN/025). -