▎ 摘　　要

NOVELTY - Rapidly detecting concentration of bismuth (III) involves dispersing nitrogen-doped graphene quantum dots (N-GQDs) in nitric acid solution, dissolving bismuth (III) nitrate pentahydrate in nitric acid solution, and then mixing two solutions and dilute with nitric acid solution to prepare a set of standard solutions with different concentrations including blank samples. The excitation wavelength of N-GDQDs is measured by a fluorescence spectrophotometer, where the fluorescence intensity of mixed solution standard samples containing trivalent bismuth ions is measured and recorded with different known concentrations including blank standard samples by fluorescence spectrophotometer under excitation wavelength. USE - Method for rapidly detecting concentration of bismuth (III). ADVANTAGE - The method rapidly detects the concentration in a simple, cost-effective and eco-friendly manner with fast and high-efficiency detection. DETAILED DESCRIPTION - Rapidly detecting concentration of bismuth (III) involves dispersing nitrogen-doped graphene quantum dots (N-GQDs) in nitric acid solution, dissolving bismuth (III) nitrate pentahydrate in nitric acid solution, and then mixing two solutions and dilute with nitric acid solution to prepare a set of standard solutions with different concentrations including blank samples. The excitation wavelength of N-GDQDs is measured by a fluorescence spectrophotometer, where the fluorescence intensity of mixed solution standard samples containing trivalent bismuth ions is measured and recorded with different known concentrations including blank standard samples by fluorescence spectrophotometer under excitation wavelength. The recorded fluorescence intensity is plotted in the mixed solution, where the leading portion of the concentration and fluorescence intensity variation curve graph is fitted to obtain a fitting formula. The bismuth (III) solution is configured to be tested into a mixed solution of N-GDQDs and bismuth (III) at optimal excitation wavelength.