期刊
MICROCHIMICA ACTA
卷 186, 期 6, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-019-3440-7
关键词
Norfloxacin; CdTe QDs; Surface imprinting technology; Molecularly imprinted polymer; Fluorescent nanoprobe; Selectivity; Wastewater; Seawater; Reverse microemulsion; Matrix effect
资金
- National Natural Science Foundation of China [41876078]
- Public Science and Technology Research Funds Projects of Ocean [201505034]
- Shandong Provincial Natural Science Foundation of China [ZR2018MD016]
- Special Fund for Basic Scientific Research in Central Colleges and Universities [201713059]
A fluorescent nanoprobe consisting of CdTe quantum dots (QDs) and coated with molecularly imprinted layers was prepared and successfully applied to the determination of norfloxacin (NOR) in seawater and wastewater samples. The 3-mercaptopropionic acid capped QDs were prepared and then covered with a protective silica shell. A molecularly imprinted layer was finally synthesized around the silanized QDs using 3-aminopropyltriethoxysilane as functional monomer and norfloxacin as the template. Compared with the non-imprinted polymer, the fluorescence of the nanoprobe with imprinted polymer (measured at excitation/emission wavelengths of 300/596 nm) is strongly reduced in the presence of NOR, and the imprinting factor is 8.8. Under the optimal experimental conditions, the detection limit of the nanoprobe is 0.18 M, and response is linear between 0.5 - 28 M of NOR. The relative standard deviation of the detection of NOR is <7.2%. In order to evaluate the practicality of the probe, wastewater and seawater samples spiked with norfloxacin were analyzed by this method, and recoveries ranged from 96.2 - 106.0%.
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