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稀土配位聚合物荧光探针的制备及其对痕量汞离子的检测
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作者单位
张磊,许森,赵雅梦,陆鸿宇,于博昊,张维冰 华东理工大学化学与分子工程学院 
基金项目:国家自然科学基金((21707034);中央高校基本科研业务费(222201814020);上海市科委仪器试剂专项(18142202500);教师产学研践习计划(YJ0130538)
中文摘要:以稀土金属铽离子为发光中心离子,鸟苷酸(GMP)为配体制备得到了能够发射绿色荧光的稀土配位聚合物。并通过加入小牛胸腺DNA溶液进一步增强荧光强度,形成“turn-on”荧光类型的稀土配合物,利用汞离子与小牛胸腺DNA的结合以及与配体GMP的相互作用使荧光猝灭,形成“turn-on-off”类型稀土荧光探针,实现了汞离子的检测。Hg2+质量浓度在50~1 200 μg·L-1范围内与体系荧光强度变化程度呈线性关系(I0-I)/I0=0.000 2C+0010 7,相关系数(r2)为0.991 5,检出限为1.5 μg·L-1,相对标准偏差(RSD)为2.3%。对河水中Hg2+进行加标回收检测,回收率为98.1%~99.8%,RSD为0.28%~1.9%。
中文关键词:稀土配位聚合物  ct-DNA  铽离子  荧光光谱法  汞离子
 
Preparation of a Fluorescent Probe Based on Terbium Coordination Polymers and Its Detection on Trace Mercury Ions
Abstract:A “turn-on-off” type fluorescent probe based on terbium coordination polymers was prepared for the detection of trace mercury ions.The terbium coordination polymers were prepared with terbium ions as luminescence center and guanyl 5 disodium phosphate(GMP) as ligand,which could emit green fluorescence.The intensity of the luminescence was increased with the addition of ct-DNA,and a “turn-on” type of fluorescent probe was formed.Then,the “turn-on-off” type fluorescent probe was formed by quenching the fluorescence with the interaction between the heavy metal mercury ions and ct-DNA and ligand of GMP with the addition of mercury ions.The calibration curve for mercury ions was linear in the range of 50-1 200 μg·L-1 ,with a correlation coefficient(r2) of 0.991 5 and a regression equation of(I0-I)/I0=0.000 2 C+0.010 7.The limit of detection was 1.5 μg·L-1,while the relative standard deviation(RSD) was 2.3%(C=600 μg·L-1,n=5).The probe was applied to the detection of trace mercury ions in river water with recoveries of 98.1%-99.8%and RSD of 0.28%-1.9%.
Key Words:lanthanide coordination polymers  ct-DNA  terbiumion  fluorescence spectroscopy  mercury ion
引用本文:张磊,许森,赵雅梦,陆鸿宇,于博昊,张维冰.稀土配位聚合物荧光探针的制备及其对痕量汞离子的检测[J].分析测试学报,2020,39(12):1527-1532.
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