The method development for analysis of MoO3 in Urtica dioica (Nettle) by adsorptive stripping voltammetry in anodic area in the presence of Calcon as liquid complexing agent

Abstract

In this work we have reported a new strategy based on multi-walled carbon nanotube incorporated carbon paste electrode (CNT/CPE) for sensitive electrochemical sensing of MoO3 in the presence of 1-(2-Hydroxy-1-naphthylazo)-2-naphthol-4-sulfonic acid sodium salt (Calcon) as a complexing agent in solution. The voltammetric results showed that Calcon as ligand was useful for detection of Mo (VI), which it improved sensitivity of CNT/CPE in the detection of Mo (VI). Using differential pulse voltammetry, we obtained tree linear segments of 2×10−9–2.2×10−4M for Mo (VI) concentrations at the surface of CNT/CPE, which the accumulation time of Mo-Calcon complex at the electrode surface was 120s in the open circuit potential. In this condition, the detection limit of Mo (VI) by signal to noise >3 was found to be 0.62nM. Combination of calcon and MWCNT at the surface of carbon paste electrode was shown capability of modified sensor for sensitive trace quantification of Mo (VI) ions in Urtica dioica (Nettle) plant by average recovery of 97.64%.