An electrochemical strategy to determine thiosulfate, 4-chlorophenol and nitrite as three important pollutants in water samples via a nanostructure modified sensor

Abstract

A voltammetric sensor was designed to analyze thiosulfate (TS), 4-chlorophenol (4-CP) and nitrite (NT), which are water pollutants, in mixed samples by combining the high conductive properties of NiO nanoparticle (NiO/NPs) and the excellent mediator properties of novel catechol derivative (2,4-dime thyl-N 0-[1-(2,3-dihydroxyphenyl)methylidene]aniline). 2,4-Dimethyl-N 0 -[1-(2,3-dihydroxyphenyl)meth ylidene]aniline was synthesized for the first time and proposed as a high-quality modifier for electrocatalytic analysis of TS and its simultaneous analysis in the presence of 4-CP and NT. At a pH = 6.0 as an optimum condition in electrochemical analysis, we seen the synergic effect for the simultaneous determination of TS, 4-CP and NT in the range of 0.05–400.0lM, 1.0–600.0lM, and 10.0–700.0lM, with a limit of detection of 0.01lM for TS, of 0.7lM for 4-CP, and of 5.0lM for NT respectively.