Abstract
Anew method based on coordination polymer nanoparticles (CPNs) derived from nucleotides and Tb3+ ions (GMP/Tb) for the selective and sensitive determination of aqueous 2,4,6-trinitrophenol(TNP) (picric acid)is established. The fluorescence of GMP/Tb nanoparticles is effectively quenched by TNP via photo-induced charge transfer (PCT), thus achieving its selectivity toward TNP over other nitroaromatic explosives. The decreased fluorescence of GMP/Tb shows a good linear relationship to the concentrations of TNP ranging from 5.0 to 40.0μM, and the limit of detection is 26.0nM (5.96ppb). Theproposed GMP/Tb probe also achieves satisfactory results in real samples. The obtained recoveries of this method in river water samples are in the range93.15-106.10%. Therelative standard deviation (RSD) are0.57 to 1.01% based on three repeated determinations. This fabricated detector provides a feasible path for determination of ppb-level TNP in natural water samples, which can help humans to avoid TNP-contaminated drinking water. Graphical abstract.
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