The amperometric nitrate sensor is a graphite pencil electrode (GPE) having an outer surface electrodeposited (coated) with a layer of cobalt, wherein the layer of cobalt is nanostructured. The graphite pencil electrode modified with nano cobalt may be used for detection and sensing nitrate ions (NO3−). The graphite pencil electrode modified with cobalt is prepared by immersing a pencil graphite electrode in an electrodeposition solution that is prepared by mixing CoCl2 in a solution of potassium chloride; and applying an electrical potential of approximately −1.3 V for 120 seconds across the graphite pencil electrode to form a graphite pencil electrode modified with nano cobalt. The graphite pencil electrode coated with nanostructured cobalt is then removed from the mixture, washed and dried, and is then ready to be used for the amperometric sensing and quantification of nitrate ions.
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