荧光铜纳米团簇用于食品和环境中 $ Cr_{2}O_{7}^{2-} $ 的检测研究

重金属离子污染问题是食品和环境安全领域的一个重要课题，因此迫切需要开发科学灵敏的检测方法。文章使用4,6-二氨基-2-巯基嘧啶（DAMP）作为配体，在温和条件下，仅通过简单的搅拌，在10 min之内合成一种发射波长为590 nm的新型铜纳米团簇（copper nanoclusters，CuNCs）。鉴于该团簇对于重铬酸根离子 $ \left(\mathrm{Cr}_{2}\mathrm{O}_{7}^{2-}\right) $高度的灵敏性和抗干扰能力，将其作为荧光探针，实现了对 $ Cr_{2}O_{7}^{2-} $的特异性和灵敏性检测，最低检出限为0.7 $ \mu $mol/L。通过加标回收试验，验证其在饮用水和湖水实际样品中对 $ Cr_{2}O_{7}^{2-} $的荧光检测能力，荧光变化显著，其加标回收率在94.3%~108.2%之间，相对标准偏差（relative standard deviation，RSD）均低于5%。结果表明该荧光探针对食品和环境中的 $ Cr_{2}O_{7}^{2-} $具有良好的检测效果。

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.