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Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy v.174, 2017년, pp.301 - 306   SCI SCIE
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A convenient method for determination of quizalofop-p-ethyl based on the fluorescence quenching of eosin Y in the presence of Pd(II)

Wu, Huan (Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Wanzhou, Chongqing, 404100, P.R. China ) ; Zhao, Yanmei (Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Wanzhou, Chongqing, 404100, P.R. China ) ; Tan, Xuanping (Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Wanzhou, Chongqing, 404100, P.R. China ) ; Zeng, Xiaoqing (Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Wanzhou, Chongqing, 404100, P.R. China ) ; Guo, Yuan (Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Wanzhou, Chongqing, 404100, P.R. China ) ; Yang, Jidong (Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Wanzhou, Chongq ) ;
  • 초록  

    Abstract A convenient fluorescence quenching method for determination of Quizalofop-p-ethyl(Qpe) was proposed in this paper. Eosin Y(EY) is a red dye with strong green fluorescence (λex/λem=519/540nm). The interaction between EY, Pd(II) and Qpe was investigated by fluorescence spectroscopy, resonance Rayleigh scattering(RRS) and UV–Vis absorption. Based on changes in spectrum, Pd(II) associated with Qpe giving a positively charged chelate firstly, then reacted with EY through electrostatic and hydrophobic interaction formed ternary chelate could be demonstrated. Under optimum conditions, the fluorescence intensity of EY could be quenched by Qpe in the presence of Pd(II) and the RRS intensity had a remarkable enhancement, which was directly proportional to the Qpe concentration within a certain concentration range, respectively. Based on the fluorescence quenching of EY-Pd(II) system by Qpe, a novel, convenient and specific method for Qpe determination was developed. To our knowledge, this is the first fluorescence method for determination of Qpe was reported. The detection limit for Qpe was 20.3ng/mL and the quantitative determination range was 0.04–1.0μg/mL. The method was highly sensitive and had larger detection range compared to other methods. The influence of coexisting substances was investigated with good anti -interference ability. The new analytical method has been applied to determine of Qpe in real samples with satisfactory results. Highlights A convenient fluorescence method for determination of Quizalorfop-p-ethyl (Qpe) was proposed. To our knowledge, this is the first fluorescence method for determination of Qpe was reported. The new analytical method was more sensitive and had larger detection range compared with other methods. The interaction between Eosin Y (EY), Pd(II) and Qpe was investigated by fluorescence spectroscopy, resonance Rayleigh scattering(RRS) and UV–Vis absorption. We demonstrated that the formed ternary chelate result in fluorescence quenching and RRS enhancement. The fluorescence quenching mechanism was discussed by Stern–Volmer equation in different temperature. The results indicated that the probable quenching mechanism was static quenching rather than dynamic quenching. Graphical Abstract Eosin Y (EY) is a red dye with strong green fluorescence (λex/λem=519nm/540nm). In our study, EY was chosen as a fluorescent sensor. Under optimum conditions, the fluorescence intensity of EY could be quenched by Quizalorfop-p-ethyl (Qpe) in the presence of Pd(II) and the resonance Rayleigh scattering (RRS) intensity had a remarkable enhancement, which were directly proportional to the Qpe concentration within a certain concentration range respectively, while the fluorescence and RRS unchanged in the absence of Pd(II). Based on fluorescence quenching, a novel, simple and sensitive fluorescence method could be developed to determination of Qpe. To our knowledge, this was the first fluorescence method for determination of Qpe was reported. [DISPLAY OMISSION]


  • 주제어

    Quizalorfop-p-ethyl .   Eosin Y .   Pd(II) .   Fluorescence .   RRS.  

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