▎ 摘　　要

NOVELTY - Composition comprises a graphene quantum dot having a particle size of 2-20 nanometer, and a residue of a corrosion inhibiting compound covalently bonded to the graphene quantum dot. USE - Composition for inhibiting and monitoring corrosion of metal surface contacted with produced water (claimed). ADVANTAGE - The composition inhibits and monitors corrosion of metal surface contacted with produced water. The water sources having petroleum products. The oil and gas industry corrosion inhibitors is applied to reduce internal corrosion in metal pipelines contacted with produced water. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for monitoring corrosion inhibitor concentration, which involves: (A) applying a corrosion inhibiting composition to a produced water to form a tagged water source, the corrosion inhibiting composition comprises a corrosion inhibiting compound effective for inhibiting corrosion of a metal surface contacted with produced water, and a graphene quantum dot having a particle size of 2-20-having a residue of the corrosion inhibiting compound covalently bonded, where the concentration of the graphene quantum dot in the tagged water source is 0.1 ppb and the total concentration of the corrosion inhibiting compound and the graphene quantum dot in the tagged water source is 5-5000 ppm; (B) irradiating the tagged water source with a source of light having a selected first range of wavelengths; and (C) measuring the luminescent emission of the tagged water source at a selected second range of wavelengths, where the measuring is carried out substantially contemporaneously with the irradiating.