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

The detection of Cd 2+ ions was studied by cyclic voltammetry (CV) and Square Wave Voltammetry (SWV). This method is mainly based on the accumulation of Cd 2+ 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 Cd 2+ 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 -4 to 5.10 -7 M; with detection limit (DL, 3 б) of 3.04x10 -6 M. 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 Cd 2+ ions in aqueous solution