Citation: LI Jing, LIU Lu, GUO Hui-Qin, LIN Li-Ke, HU Si-Yu, RUAN Jia-Jian, LIU Wan-Sha, YAN Liu-Shui, LI Ke-Xin. An Upconversion Fluorescent Method for Rapid Detection of Perfluorooctane Sulfonate in Water Samples Based on Fluorine-Fluorine Interaction[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(3): 380-387. doi: 10.19756/j.issn.0253-3820.181639 shu

An Upconversion Fluorescent Method for Rapid Detection of Perfluorooctane Sulfonate in Water Samples Based on Fluorine-Fluorine Interaction

LI Jing ^1,3, ,
LIU Lu ² ,
GUO Hui-Qin ^1,3 ,
LIN Li-Ke ^1,3 ,
HU Si-Yu ² ,
RUAN Jia-Jian ² ,
LIU Wan-Sha ² ,
YAN Liu-Shui ^1,3 ,
LI Ke-Xin ^1,3

1.
School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2.
School of International Education, Nanchang Hangkong University, Nanchang 330063, China;
3.
Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang 330063, China

Received Date: 12 October 2018
Revised Date: 2 January 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21665018, 21366024), the Natural Science Foundation of Jiangxi Province (No. 20181BAB203014), the Foundation of Jiangxi Educational Committee (No.GJJ160724) and the Jiangxi Postgraduate Innovation Fund (No.YC2018-S361).

As a typical of emerging persistent organic pollutant, perfluorooctane sulfonate (PFOS) and its salt cause ecosystem pollution due to their properties of environmental persistence, genetic toxicity, bio-accumulation and long-range transportation. In this study, NaYF₄:Yb,Er upconversion luminescence particle which had low toxicity, high photostability and good water solubility were prepared, and then modified by N,O-bis(trimethylsilyl) trifluoroacetamide (BSTFA) to obtain NaYF₄:Yb,Er@SiO₂-BSTFA. The luminescent material was used as fluorescence probe to interact with PFOS and a new method for fluorescent analysis of PFOS in water was hence established. In Britton-Robinson(BR, pH 6.30) buffer solution, PFOS can rapidly combine with NaYF₄:Yb,Er@SiO₂-BSTFA by fluorine-fluorine interaction, resulting in the fluorescence quenching of NaYF₄:Yb,Er@SiO₂-BSTFA in some extent. The study shows that the reduced fluorescence intensity at 545 nm are in proportional to the concentration of PFOS in the range of 3-100 nmol/L(R²=0.9985), with a detection limit (3σ) of 2.43 nmol/L. The proposed method for detection of PFOS showed obvious advantages compared with those methods reported in the literatures. The selectivity and interference experiments results indicated that the fluorescence probe had good selective response to PFOS in the presence of other common ions and PFOS analogues in water. The method was successfully applied to the determination of PFOS in real water samples with RSD ≤ 9.8% (n=5) and the recovery was 85.8%-118.6%.
- Fluorine-fluorine interaction,
- Upconversion fluorescence,
- Perfluorooctane sulfonate,
- Rapid detection
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