Journal
JOURNAL OF ANALYTICAL CHEMISTRY
Volume 64, Issue 6, Pages 632-636Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1061934809060161
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In the present work, carbon paste electrodes (CPE) modified with conducting polymers 1,8-diaminonaphtalene (DAN) was developed for the voltammetric determination of Cu(II). The modified electrode exhibited a significantly increased sensitivity and selectivity for Cu2+ compared with a bare carbon paste electrode. Copper(II) was preconcentrated at open circuit on the modified electrode. The measurements were carried out using a rotating disk electrode (RDE) as working electrode. The experimental parameters for the determination of Cu(II) were optimized. The Cu(II) ions were chemically deposited onto the surface of poly DAN-CPE in an acidic medium. Under the optimum conditions, a linear calibration graph was obtained in the concentration range of 0.1 to 250 ppb with a correlation coefficient of 0.9998. The relative standard deviation for 6 successive determinations was 4.7%. A study of interfering substances was also performed, and the method was applied to the direct determination of copper in real samples like tap water and orange juice samples.
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