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In this article a new coated platinum Cu²⁺ ion selective electrode based on 2-((2-(2-(2-(2-hydroxy-5-methoxybenzylideneamino)phenyl)disufanyl)phenylimino) methyl)-4-methoxyphenol Schiff base (L₁) as a new ionophore is described. This sensor has a wide linear range of concentration (1.2×10⁻⁷–1.0×10⁻¹molL⁻¹) and a low detection limit of 9.8×10⁻⁸molL⁻¹of Cu(NO₃)₂. It has a Nernstian response with slope of 29.54±1.62mVdecade⁻¹ and it is applicable in the pH range of 4.0–6.0 without any divergence in potentioal. The coated electrode has a short response time of approximately 9s and is stable at least for 3.5 months. The electrode shows a good selectivity for Cu²⁺ ion toward a wide variety of metal ions. The proposed sensor was successfully applied for the determination of Cu²⁺ ion in different real and environmental samples and as indicator electrode for potentiometric titration of Cu²⁺ ion with EDTA.