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The heavy metal ion Cu2+ was used as the research object in this study. Cu2+ was detected using a cysteine- and glutathione-modified cadmium telluride quantum dot solution. Compounds of Cu2+ and modified quantum dots on the surface caused the fluorescence quenching of quantum dots. A linear relationship existed between the concentration and the intensity of the change in fluorescence quenching. Using this linear relationship, the quantitative detection of the Cu2+ content in the solution bydoi:10.5755/j02.ms.28024 doaj:a5079cc5a75f4e23aff6a82fb2da6195 fatcat:m46bpboqlrfqtc6ppxhfusbmxa