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

Fluorescent copper nanoclusters for the detection of Cr_(2)O_(7)^(2-)in food and environment

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(Cr_(2)O_(7)^(2-))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0.7μmol/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 0.7μmol/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.