Abstract

Copper oxide impregnated glassy carbon spheres (CuxOGCS where x = 1or2) modified basal plane pyrolytic graphite electrode (CuxOGCS-BPPGE) was demonstrated as electrochemical interface for nitrite/nitrate sensing. The CuxOGCS were synthesized by impregnating glassy carbon spheres GCS with 0.5 M CuNO2 solution followed by thermal treatment at 823 K. Electrochemical and spectroscopic studies of the composites confirms the copper oxide formation during synthesis. The electrocatalytic oxidation/reduction studies of the nitrite/nitrate on a CuxOGCS-BPPG electrode has been studied by cyclic voltammetry (CV). The detection limits obtained were 1.032 μg L−1 for nitrate and 2.038 μg L−1 for nitrite respectively. The sensitivity of the method was about 1500 μA μM−1 cm−2 for nitrite determination. It has been demonstrated that the composite electrode can be used to analyze nitrate/nitrite in soil and fruit juice samples.

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