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The author describes a voltammetric sensor for the simultaneous determination of formaldehyde and ammonia using rGO/ZnO composite micro-dumbbell shaped rods. A facile hydrothermal technique was adopted to synthesize rGO/ZnO composite based micro-dumbbell shaped rods. The potential application based on obtained product has been employed as electrochemical sensor towards the detection of ammonia and formaldehyde using hexamine. For performing an electrochemical sensing application, glassy carbon electrode was modified with rGO/ZnO composite rods and analysed for the formation of multiple peaks thus emphasizing the detection of formaldehyde and ammonia using hexamine. Hexamine is toxic food preservative when it dissolutes in saline medium containing pH 7.4 emits ammonia and formaldehyde. The crystallinity property has been examined using X-ray diffraction technique …