Determination of Ag⁺ and Cu²⁺ ions in mixture samples obtained in the microwave assisted polyol process by differential pulse anodic stripping voltammetry (DPASV) method

A simple and selective differential pulse anodic stripping voltammetry (DPASV) method for the determination of Ag⁺ and Cu²⁺ ions in mixture samples obtained in the microwave assisted polyol process was developed and validated. Analytical methods for the preparation of the reaction mixture for voltammetric analysis (dilute samples in the supporting electrolyte) were worked out and optimized. All measurements were conducted in three-electrode cell system equipped with glassy carbon electrode (GCE) as a working electrode, silver/silver chloride (Ag|AgCl|KCl_(sat.)) as a reference and platinum wire as a auxiliary electrode. The optimal conditions for quantitative determination were obtained in an mixture Britton-Robinson buffer at pH 4.1/ethylene glycol (100/1; v/v). The calibration curves of analysed compounds are linear within the range of concentration: 0.032-0.420 μg mL^-1 and 0.075-0.960 μg mL^-1 for Ag⁺ and Cu²⁺, respectively. Good linear behaviour over the investigated concentration ranges were observed with the values of r² higher than 0.996 for the silver and cooper ions. The accuracy of analytical determinations ranged from 0.4 to 3.6%. The levels of analysed ions in the reaction mixture can be successfully determined using this developed method with no matrix effect.