Journal
MICROCHIMICA ACTA
Volume 186, Issue 12, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3886-7
Keywords
Fluorescence spectra; UV-visible spectroscopy; Cyclic voltammetry; Transmission electron microscopy; X-ray photoelectron spectroscopy
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Funding
- Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences [1630082017002, 1630082017001]
- National Science and Technology Major Project of the Ministry of Science and Technology of China [2016YFD0201203]
- National Natural Science Foundation of China [21607171]
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A fluorometric assay is described for the determination of Cd(II) in environmental and agricultural samples. It is making use of a molecularly imprinted polymer (MIP) and aptamer as dual recognition units, while carbon quantum dots (co-doped with sulphur and nitrogen) and gold nanoparticles (SN-CQD/Au) act as the fluorophores. The aptamer-modified MIP was placed on an SN-CQD/Au-modified indium tin oxide glass electrode. Cd(II) was detected with high selectivity by the recognition sites of the aptamer in the MIP. Fluorescence, with excitation/emission peaks at 370/430 nm, is quenched by Cd(II). Response is linear in the 20 pM to 12 nM concentration range. The detection limit is 1.2 pM. The sensor is selective for Cd(II), and recoveries from spiked waters, soils and vegetables real-world samples range between 82.1 and 113.9%.
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