▎ 摘　　要

NOVELTY - Metal ion detection method involves preparing graphene quantum dots by hydrothermal method, preparing nitrogen-doped graphene quantum dots, phosphorus-doped graphene quantum dots, sulfur-doped graphene quantum dots and boron-doped graphene quantum dots using graphene quantum dots as raw materials, preparing a fluorescent probe array using graphene quantum dots and doped graphene quantum dots, recording the changes in fluorescence intensity of the graphene quantum dots caused by several metal ions, and detecting and distinguishing metal ions using linear discriminant analysis. USE - Metal ion detection method based on graphene quantum dot fluorescent probe array. ADVANTAGE - The method detects metal ion with excellent controllability, in a short period of time. The graphene quantum dot fluorescent probe array is economically prepared by simple process, and distinguishes metal ions with high accuracy.