Abstract: Heavy metal ion contamination is an important issue in the field of food and environmental safety, so it is urgent to develop scientific and sensitive detection methods. In this paper, using 4,6-diamino-2-mercaptopyrimidine(DAMP) as a ligand, a novel copper nanoclusters(CuNCs) emitted at 590 nm was synthesized by simple stirring within ten minutes in mild conditions. In view of its high sensitivity and anti-interference ability to dichromate ion( $ Cr_{2}O_{7}^{2-} $), the cluster was used as a fluorescent probe to achieve the specificity and sensitivity detection of $ Cr_{2}O_{7}^{2-} $, with the minimum detection limit of $ 0.7\ \mu mol/L $. The fluorescence detection ability of $ Cr_{2}O_{7}^{2-} $ in actual samples such as drinking water and lake water was verified by the labeling recovery test. The fluorescence changed significantly, and the labeling recovery rate was in the range of 94.3%-108.2% with its relative standard deviation (RSD) lower than 5%. The results show that the fluorescent probe has a good prospect for the detection of $ Cr_{2}O_{7}^{2-} $ in food and environment.
Keywords: food safety; environmental safety; heavy metal contamination; copper nanoclusters (CuNCs); dichromate ion $ (\mathrm{Cr}_{2}\mathrm{O}_{7}^{2-}) $; fluorescence detection
合肥工业大学学报自科版