▎ 摘　　要

NOVELTY - Detection of sodium formaldehyde sulfoxylate by fluorescence based on nitrogen-doped graphene quantum dot ratio fluorescence involves mixing sample solution to be tested, nitrogen-doped graphene quantum dot solution and 1,4-naphthoquinone solution for reaction, measuring fluorescence intensity at 420 nm and 440 nm at the excitation wavelength of 360nm with fluorescence spectrophotometer, calculating the fluorescence intensity ratio (I420/I440) at 420 nm and 440 nm, and introducing fluorescence intensity ratio (I420/I440) into standard curve to calculate the concentration of sodium formaldehyde sulfoxylate in the sample to be tested. USE - Detection of sodium formaldehyde sulfoxylate in food e.g. solid or powdered food such as vermicelli, rice noodle, bean curd stick, flour, canned food, and white sugar (all claimed). ADVANTAGE - The method is simple and economical, and has visible detecting result, does not need large instruments and professional operators, and reliable detection results, and can detect rongalite block qualitatively and quantitatively. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for application of detection of sodium formaldehyde sulfoxylate by fluorescence based on nitrogen-doped graphene quantum dot ratio fluorescence in food.