Chuan-xiao YANG, Wei-bin GONG, Fan TANG, Xiang-ying SUN. Determination of Sodium Hexametaphosphate by Ratiometric Fluorescence Method Based on Formaldehyde Functionalized Polyethyleneimine/Eosin Y System[J]. Spectroscopy and Spectral Analysis, 2021, 41(2): 454
- Spectroscopy and Spectral Analysis
- Vol. 41, Issue 2, 454 (2021)
Fig. 1. Scheme of the reaction between FPEI/EY and SHMP
Fig. 2. UV-Vis absorption and Fluorescence emission spectra of FPEI under different excitation wavelengths
Fig. 3. Fluorescence spectra of the reaction between FPEI/EY (a) and SHMP (b)
Concentration: EY: 4.0 μmol·L-1; FPEI, 1.0 mL; pH 3.93;λ ex=340 nm
Concentration: EY: 4.0 μmol·L-1; FPEI, 1.0 mL; pH 3.93;
Fig. 4. FTIR spectra of FPEI (a) and absorption spectra of the reaction between FPEI/EY and SHMP (b)
Fig. 5. Effect of excitation wavelength on the fluorescence intensity
FPEI: 1.0 mL; EY: 4 μmol·L-1; pH 3.93
FPEI: 1.0 mL; EY: 4 μmol·L-1; pH 3.93
Fig. 6. Effect of pH on the reaction between FPEI/EY and SHMP
FPEI: 1.0 mL; EY: 4 μmol·L-1; SHMP: 4 μmol·L-1;λ ex=340 nm
FPEI: 1.0 mL; EY: 4 μmol·L-1; SHMP: 4 μmol·L-1;
Fig. 7. Effect of formaldehyde on the fluorescence increasing of EY by SHMP
FPEI: 1.0 mL; EY: 4 μmol·L-1; SHMP: 2.4 μmol·L-1; pH 3.93
FPEI: 1.0 mL; EY: 4 μmol·L-1; SHMP: 2.4 μmol·L-1; pH 3.93
Fig. 8. Effect of EY on the reaction between FPEI/EY and SHMP
FPEI: 1.0 mL; EY: 4 μmol·L-1; SHMP: 2.4 μmol·L-1;λ ex=340 nm; pH 3.93
FPEI: 1.0 mL; EY: 4 μmol·L-1; SHMP: 2.4 μmol·L-1;
Fig. 9. Plots of fluorescence intensity at 540 nm and F 540/F 470via the concentrations of SHMP
FPEI: 1.0 mL; pH 3.93,λ ex=340 nm
FPEI: 1.0 mL; pH 3.93,
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Table 1. Effect of EY on analytical parameters for determination
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Table 2. Analytical parameters for determination
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Table 3. Results for the determination of SHMP in drink samples
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