▎ 摘　　要

NOVELTY - Detecting nitroaniline isomers involves dissolving the graphene quantum dots in distilled water to obtain a graphene quantum dot solution with a mass concentration of 1 mg/mL. The beta-cyclodextrin solution is dissolved in distilled water to give beta-cyclodextrin solution with a mass concentration of 10 mg/mL, which is mixed with graphene quantum dot solution to obtain composite material solution. USE - Method for detecting nitroaniline isomers (claimed). ADVANTAGE - The method enables to detect nitroaniline isomers, that has high sensitivity, wide linear range, and can be used for simultaneous detection of the three isomers of nitroaniline in the actual sample without prior separation. DETAILED DESCRIPTION - Detecting nitroaniline isomers involves dissolving the graphene quantum dots in distilled water to obtain a graphene quantum dot solution with a mass concentration of 1 mg/mL. The beta-cyclodextrin solution is dissolved in distilled water to give beta-cyclodextrin solution with a mass concentration of 10 mg/mL, which is mixed with graphene quantum dot solution to obtain composite material solution. The cleaned glassy carbon electrode is immersed in the composite solution and is scanned by cyclic voltammetry for 20 cycles in the range of -1.0-2.0 volt to obtain a stable graphene quantum dot and beta-cyclodextrin composite modified glassy carbon electrode, which is used as the working electrode, the platinum wire electrode is used as the auxiliary electrode and the silver/silver chloride electrode is used as the reference electrode. The potassium dihydrogen phosphate and disodium hydrogen phosphate buffer solution with pH of 6.8 containing 0.6-20 micrograms/mL nitroaniline isomer solution is scanned by differential pulse voltammetry with 0.2 volt to -0.6 volt scan. The peak potentials of the three isomers are -0.02 volt, -0.22 volt, -0.43 volt, and the linear relationship between the oxidation peak current and the concentration of the nitroaniline isomers in the solution is obtained. The quantitative analysis of the concentration of the nitroaniline isomers in the sample is carried out, where the supporting electrolyte for the buffer solution is 0.1 M potassium chloride.