Conventional three-electrode system was employed for the electrochemical measurements. A platinum plate with surface area of 1 cm2 was utilised as an auxiliary electrode (counter electrode). Potentials were measured against an Ag/AgCl reference electrode filled with 3 M KCl which has a potential of +0.204 V against a standard hydrogen electrode (SHE). A Radiometer PGZ100 potentiostat was used in combination with a Frequency Response Analyser (FRA). The background electrolyte performed in all electrochemistry experiments was pH 10 buffered solutions (prepared by mixing 100 mL 0.025 M Na2B4O7⋅10H2O and 36.6 mL 0.1 M NaOH). Open circuit potential (OCP), cyclic voltammetry and electrochemical impedance spectroscopy (EIS) were performed in the above buffered solutions with a volume of 200 mL at room temperature in the absence and presence of 1 mM PAX and 3.846 mM cyanide species individually and in combination. Deionized water (18 MΩ cm) was used in all electrochemical experiments.