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The Cu-CDs nanozyme had been prepared from ethylenediaminetetraacetic acid copper disodium sodium (Na2[Cu (EDTA)]) by one-step pyrolysis method. Under ideal circumstances, the fluorescence power of DAP is linearly proportional to your Cr(III) ion focus in the array of 5 × 10-6 to 1.5 × 10-4 mol L-1 as well as the detection limitation is 1.2 × 10-7 mol L-1. The technique features an excellent anti-interference performance against some metal ions, such as, Hg2+, Co2+, Cu2+, Mg2+, Ba2+, K+, Mn2