荧光
铜
检出限
化学
水溶液中的金属离子
金属
吸附
硫黄
离子
选择性
分析化学(期刊)
无机化学
色谱法
物理化学
有机化学
光学
物理
催化作用
作者
Xiaogang Wang,Wenheng Li,Xiaohong Wang,Dongshan Xiang,Kun Zhai
摘要
ABSTRACT In this paper, a highly sensitive method for sulfur ion (S 2− ) detection was developed based on a four‐color fluorescence probe constructed from copper‐containing metal–organic framework (CuBDC) and four dye‐labeled single‐strand DNA (ssDNA). In the absence of S 2− , dye‐labeled ssDNA can be adsorbed on the surface of CuBDC, and the dyes are close to copper ion on the CuBDC surface, their fluorescence is quenched by copper ion, and their fluorescence signals are weak. In the presence of S 2− in the system, S 2− reacts with copper ion in CuBDC to form CuS, which has a more stable structure than complex CuBDC, resulting in the decomposition of CuBDC. In this case, dye‐labeled ssDNA are detached from the CuBDC surface and dissolved in the solution, and the fluorescence of the dyes is restored. Under the optimized conditions, there is a good linear relationship between the total fluorescence intensity of four dyes and the concentration of S 2− in the range of 2 × 10 −9 to 5 × 10 −8 mol/L; the detection limit is 2.2 × 10 −10 mol/L. The method has a good selectivity and accuracy, and it can be applied to the analysis and detection of S 2− in actual water samples.
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