Voltammetric Determination of Thiosulfate in Presence of p-Nitrophenol Using an Electrochemical Nanostructure Sensor Modified with a New Mediator

Thiosulfate and p -nitrophenol are two important water pollutants and the presence of them can be harmful for human body. The electro-catalytic interaction between thiosulfate and 2-chloro- N' -[1-(2,5-dihydroxyphenyl) methylidene]aniline, was studied by voltammetric methods. The sensor included carbon paste electrode modified with 2-chloro- N' -[1-(2,5-dihydroxyphenyl) methylidene]aniline and CdO nanoparticle was used as highly sensitive tool for determination of thiosulfate. The proposed sensor resolves overlapping oxidation signals of thiosulfate and p -nitrophenol as two important pollutants for simultaneously determinations. According to the results, it was understood that the proposed working electrode assist to determination of thiosulfate and p -nitrophenol at concentration ranges of 0.09–350.0 and 1.0–550.0 μM with the respective limits of detection 40.0 nM and 0.5 μM. The developed working electrode was used for the determination of thiosulfate and p -nitrophenol at different real water samples.