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https://doi.org/10.15255/KUI.2022.061

Determination of Cu2+ Ions Concentration by Electrochemical Methods

Senka Gudić orcid.org/0000-0001-5390-5215 ; Sveučilište u Splitu, Kemijsko-tehnološki fakultet, Ruđera Boškovića 35, 21 000 Split
Nikolina Krišto orcid.org/0009-0005-4185-738X ; Sveučilište u Splitu, Kemijsko-tehnološki fakultet, Ruđera Boškovića 35, 21 000 Split

Sažetak

The possibility of determining the concentration of heavy metal ions, i.e., Cu2+ ions in an aqueous solution of CuSO₄ ∙ 5H₂O, was tested by electrochemical means. For this purpose, polarisation curves were recorded on a Pt electrode in solutions of known (0.1, 0.5, 1.0, 2.5, 5.0, 7.5, 10.0, 50.0, and 100.0 mM) and unknown concentrations of Cu2+ ions with the reading of the limiting diffusion current. Polarisation measurements were performed in the potential range from open circuit potential to −3.0 V with different potential scan rates (1, 5, 10, 20, and 50 mV s–1). By cathodic deposition on the Pt surface, a reddish-brown copper coating was deposited, the thickness of which increased as the concentration of Cu2+ ions in the solution increased. Furthermore, the limiting diffusion current i_d increased linearly with the increase in Cu2+ ion concentration, c. The i_d = f(c) plot was constructed and the unknown concentrations of Cu2+ ions in three randomly prepared CuSO₄ ∙ 5H₂O solutions were determined. Heavy metal ions from polluted waters (Cu2+ ions) can be successfully removed by electrochemical means, and their concentration determined.

Ključne riječi

heavy metal ions; copper; polarisation measurements; electrodeposition; limiting diffusion current

Hrčak ID:

301825

URI

https://hrcak.srce.hr/301825

Datum izdavanja:

17.5.2023.

Podaci na drugim jezicima: hrvatski

Posjeta: 876 *