Journal
TALANTA
Volume 143, Issue -, Pages 450-456Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2015.05.024
Keywords
Copper nanoclusters; Phosphate ions; Fluorescence probe; Lanthanide ions
Categories
Funding
- National Natural Science Foundation of China [21277111]
- Fundamental Research Funds for the Central Universities [XDJK2013D001, XDJK2013A022]
Ask authors/readers for more resources
This paper reports an off-to-on fluorescence (FL) probe for sensitively and selectively detecting phosphate ions (Pi's). Fabrication of the probe was based on the competition between Pi's and tannic acid-stabilized copper nanoclusters (TA-Cu NCs) for Eu3+ binding. The addition of Eu3+ ions to TA-Cu NCs triggered the aggregation of TA-Cu NCs, which quenched the FL of TA-Cu NCs. After Pi addition, the aggregated TA-Cu NCs solubilized into the aqueous solution to facilitate the Pi-triggered dispersion of TA-Cu NCs. This phenomenon was due to the stronger binding ability between Pi's and Eu3+ than that between TA and Eu3+, leading to FL recovery of Cu NCs. The degree of redispersion of TA-Cu NCs was directly related to Pi concentration. Thus, Pi concentration can be quantitatively determined by the change in FL of the TA-Cu NCs dispersion. Under the optimized conditions, the change in FL presented a linear relationship with Pi concentration from 0.07 mu mol L-1 to 80 mu mol L-1. The limit of detection for Pi was 9.6 x 10(-3) mu mol L-1 at a signal-to-noise ratio of 3. For Pi determination in real samples, only 1 mL water sample was needed. The proposed probe was highly sensitive, free from the interference of other common species in aqueous media, and particularly useful for the fast and simple diagnosis of water-eutrophication extent. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available