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[Display omitted] • Industrial scale adopted chemical method used for preparation of Sn doped CeO 2. • Sn-CeO 2 /GCE electrode demonstrated as an excellent electrocatalytic oxidation of nitrite (NO 2 –) • The remarkable sensitivities of nitrite found that 245.4 µA cm−2 mM−1 and 89.53 µA cm−2 mM−1. • The limit of detection (LOD) towards nitrite ion sensing was found to be 16 nM. Development of novel electrode materials for sensing water pollutant like nitrite, nitrate, paramedical pollutants and fertilizers is a more promising research area in electrochemical sensor field. Various pure as well as doped metal oxides were used as electrodes for sensing the water pollutants but, deficits in stability, reproducibility and real time analysis. In the present work, a promising Sn-doped CeO 2 based sensor was fabricated for sensing nitrite in water. A selective concentration of Sn (5%) doped CeO 2 nanoparticles were synthesized by facile chemical precipitation method. The structural, optical and morphological information were studied using various techniques. The morphological of the sample was revealed an agglomerated with spherical nanoparticles with size of 8.5 nm. The synergistic effect of Sn-CeO 2 /GCE improves the electrochemical behavior of nitrite on the modified surface. Sn-doped CeO 2 nanoparticles has a better surface property and provides a more fine-grained media to facilitate electron transfer during the reaction between analyte and electrode. The Sn-CeO 2 /GCE electrode possesses excellent electrocatalytic oxidation of nitrite (NO 2 –) which was investigated by cyclic voltammetry (CV) and amperometry techniques. The remarkable sensitivities of nitrite were found that 245.4 µA cm−2 mM−1 and 89.53 µA cm−2 mM−1 with R2 = 0.999 and RSD of ∼ 6%. Similarly, the limit of detection (LOD) towards nitrite ion sensing was found to be 16 nM. The real time application of Sn-CeO 2 /GCE sensor was demonstrated by the detection of nitrite present in environmental water samples with excellent recoveries. Hence, Sn-doped CeO 2 modified electrode also demonstrates good reproducibility, long time stability, and excellent selectivity properties. Thus, a developed electrochemical sensor possesses a novel promise for the construction of simple and sensitive nitrite analytical stage. [ABSTRACT FROM AUTHOR]