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Citation: SUN Xiao-Jie, MIAO Yan-Ming, LYU Jin-Zhi, LUO Shi-Qing, WANG Rui-Rui, YAN Gui-Qin. Determination of Fluoride Ion in Environmental Water Based on Manganese-Doped Zinc Sulfide Quantum Dots/Europium (Ⅲ) Nanocomposites[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(9): 1366-1372. doi: 10.19756/j.issn.0253-3820.181654 shu

Determination of Fluoride Ion in Environmental Water Based on Manganese-Doped Zinc Sulfide Quantum Dots/Europium (Ⅲ) Nanocomposites

College of Life Science, Shanxi Normal University, Linfen 041004, China

Received Date: 17 October 2018
Revised Date: 28 May 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (No.31700862), the Natural Science Foundation for Young Scientists of Shanxi Province, China (No. 201601D021109) and the Graduate Science and Technology Innovation Project of Shanxi Normal University (No. 2017SCX039).

An optical sensing system for specific detection of F^- was developed on the basis of room-temperature phosphorescence of manganese-doped Zinc sulfide quantum dots (Mn-ZnS QDs). In this system, Eu³⁺ bonded with Mn-ZnS QDs to form nanocomposites, and the energy transfer due to the approach of QDs quenched the room-temperature phosphorescence. In the presence of F^-, the stong coordinative competition between F^- and Eu³⁺ collapsed the aggregation-state of QDs and thereby gradually recovered the phosphorescence, which contributed to the trace F^- detection. This method based on phosphorescence sensing avoids the interference from background fluorescence and scattering light in complex environmental substrate and is featured with high convenience and sensitivity. This method had a detection limit of 0.05 mg/L, a linear range of 0.2-20.0 mg/L, and a relative standard deviation of 3.2% in determination of F^-. The spiked recovery of F^- in environmental water samples was 94%-106%. This study offers an efficient method for F^- detection in environmental water bodies.
- Phosphorescent quantum dot,
- Energy transfer,
- Europium ion,
- Fluoride ion
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