F. Jeffali, M. El Mahi, El M. Lotfia, S. El Hajjaji.

Moroccan Journal of Chemistry, Vol 9, No 3 (2021)

Detecting cadmium(II) by using coal extracted from argan oilcake waste (Argania spinosa) as modifier of carbon paste electrode.

K. Abbi, L. Hermouch, Y. elhamdouni, N. Labjar, A. Skalli, I. Merimi, F. Jeffali, M. El Mahi, El M. Lotfia, S. El Hajjaji.

Abstract

The detection of Cd²⁺ ions was studied by cyclic voltammetry (CV) and Square Wave Voltammetry (SWV). This method is mainly based on the accumulation of Cd²⁺ ions on the surface of a carbon paste electrode modified by coal extract from argan oilcake waste (AC-CPE). To evaluate the detection performance of AC-CPE against Cd²⁺ ions, an optimization study was carried out to determine the following optimal conditions, pH=5, preconcentration time of 120s, and deposition potential of 1.2V. Under these optimal conditions, a linear relationship between current peak intensity and concentration has been defined over a concentration range from 5.10^-4to 5.10^-7M; with detection limit (DL, 3 б) of 3.04x10^-6M. An analytical application of the electrode in a real matrix, tap water, was performed and revealed good detection performance of AC-CPE. These results show that the AC-CPE can be used as an excellent detector of Cd²⁺ ions in aqueous solution