Simultaneous voltammetric determination of peracetic acid and the coexistent hydrogen peroxide using carbositall rotation electrode

Abstract

The aim of the present work is to determine the feasibility of peracetic acid (PAA) and the coexistent hydrogen peroxide (HP) simultaneous quantitative determination in disinfectant solution by voltammetry using carbositall rotation electrode (CE) as indicating electrode. It has been experimentally proved that the optimum pH for analysis is approximately 3.6. The linear relationship has been observed in the PAA concentration range (3.12–12.50)10–5 mol L–1, the calibration curve equation was Iр = (3.78 ± 0.46)103с (r = 0.995); in the HP concentration range of (0.94–3.76)10–4 mol L–1, the calibration curve equation was Iр = (3.57 ± 0.26)103с + (0.11 ± 0.07) (r = 0.998). Determining PAA in the working solution with the concentrations of 6.2410–5, 7.8010–5 and 9.3610–5 mol L–1 the RSDs were 0.035, 0.028 and 0.022 respectively (δ = +0.30...+0.90%), determining HP in the working solution with the concentrations of 1.8810–4, 2.3510–4 and 2.8210–4 mol L–1 the RSDs were 0.028, 0.018 and 0.011 respectively (δ = –0.77…+0.92%). Determining PAA in the test solution of "Delakson" disinfectant with the concentrations of 0.1%, the RSD was 0.024 (δ = +0.9%). Determining HP in the test solution of "Delakson" disinfectant, the RSD was 0.012 (δ = +1.69%). Thus, a new voltammetric method of simultaneous determination of peracetic acid and the coexistent hydrogen peroxide in disinfectant on CE has been developed, and the possibility of its quantitative determination has been shown.