Identification and Determination of Oil Pollutants Based on 3-D Fluorescence Spectrum Combined with Self-weighted Alternating Trilinear Decomposition Algorithm

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  • ABSTRACT

    Oil pollution seriously endangers the biological environment and human health. Due to the diversity of oils and the complexity of oil composition, it is of great significance to identify the oil contaminants. The 3-D fluorescence spectrum combined with a second order correction algorithm was adopted to measure an oil mixture with overlapped fluorescence spectra. The self-weighted alternating trilinear decomposition (SWATLD) is a kind of second order correction, which has developed rapidly in recent years. Micellar solutions of #0 diesel, #93 gasoline and ordinary kerosene in different concentrations were made up. The 3-D fluorescence spectra of the mixed oil solutions were measured by a FLS920 fluorescence spectrometer. The SWATLD algorithm was applied to decompose the spectrum data. The predict concentration and recovery rate obtained by the experiment show that the SWATLD algorithm has advantages of insensitivity to component number and high resolution for mixed oils.


  • KEYWORD

    SWATLD , 3-D fluorescence spectrum , Oil mixture , Component number

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  • [FIG. 1.] The decomposition diagram of PARAFAC model.
    The decomposition diagram of PARAFAC model.
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  • [FIG. 2.] Process flow chart of SWATLD.
    Process flow chart of SWATLD.
  • [TABLE 1.] The concentration of SDS micellar solution and the fluorescence intensity of kerosene SDS micellar solution
    The concentration of SDS micellar solution and the fluorescence intensity of kerosene SDS micellar solution
  • [TABLE 2.] The oil concentration in each sample (mg/L)
    The oil concentration in each sample (mg/L)
  • [FIG. 3.] 3-D fluoresence spectra of three standard samples. (a) 3-D fluoresence spectrum of diesel standard sample. Concentration: 10 mg/L; Width between excitation and emission slit: 1.11 mm; Excitation and emission step length: 5 nm; (b) 3-D fluoresence spectrum of gasoline standard sample. Concentration: 50 mg/L; Width between excitation and emission slit: 1.11 mm; Excitation and emission step length: 5 nm.; (c) 3-D fluoresence spectrum of kerosene standard sample. Concentration: 10 mg/L; Width between excitation and emission slit: 1.11 mm; Excitation and emission step length: 5 nm.
    3-D fluoresence spectra of three standard samples. (a) 3-D fluoresence spectrum of diesel standard sample. Concentration: 10 mg/L; Width between excitation and emission slit: 1.11 mm; Excitation and emission step length: 5 nm; (b) 3-D fluoresence spectrum of gasoline standard sample. Concentration: 50 mg/L; Width between excitation and emission slit: 1.11 mm; Excitation and emission step length: 5 nm.; (c) 3-D fluoresence spectrum of kerosene standard sample. Concentration: 10 mg/L; Width between excitation and emission slit: 1.11 mm; Excitation and emission step length: 5 nm.
  • [FIG. 4.] 3-D fluoresence spectra of mixed samples. (a) 3-D fluoresence spectrum of a mixed solution of diesel and gasoline. Concentration of diesel and gasoline is 10 mg/L and 10 mg/L, respectively. Width between excitation and emission slit: 1.11 mm; Excitation and emission step length: 5 nm.; (b) 3-D fluoresence spectrum of a mixed solution of diesel, gasoline. and kerosene. Concentration of diesel, gasoline and kerosene is 10 mg/L, 10 mg/L and 10 mg/L respectively. Width between excitation and emission slit: 1.11 mm; Excitation and emission step length: 5 nm.
    3-D fluoresence spectra of mixed samples. (a) 3-D fluoresence spectrum of a mixed solution of diesel and gasoline. Concentration of diesel and gasoline is 10 mg/L and 10 mg/L, respectively. Width between excitation and emission slit: 1.11 mm; Excitation and emission step length: 5 nm.; (b) 3-D fluoresence spectrum of a mixed solution of diesel, gasoline. and kerosene. Concentration of diesel, gasoline and kerosene is 10 mg/L, 10 mg/L and 10 mg/L respectively. Width between excitation and emission slit: 1.11 mm; Excitation and emission step length: 5 nm.
  • [FIG. 5.] Core consistency value of .
    Core consistency value of .
  • [FIG. 6.] The spectra of actual solution and SWATLD analyzed solution. (a) Fluorescence excitation spectra. “OOOO” : the actual spectrum of gasoline; “ΔΔΔΔ” : the actual spectrum of diesel; Factor 1 and factor 2: the components obtained by SWATLD algorithm. (b) Fluorescence emission spectra. “OOOO” : the actual spectrum of gasoline; “ΔΔΔΔ” : the actual spectrum of diesel; Factor 1 and factor 2: the components obtained by SWATLD algorithm.
    The spectra of actual solution and SWATLD analyzed solution. (a) Fluorescence excitation spectra. “OOOO” : the actual spectrum of gasoline; “ΔΔΔΔ” : the actual spectrum of diesel; Factor 1 and factor 2: the components obtained by SWATLD algorithm. (b) Fluorescence emission spectra. “OOOO” : the actual spectrum of gasoline; “ΔΔΔΔ” : the actual spectrum of diesel; Factor 1 and factor 2: the components obtained by SWATLD algorithm.
  • [TABLE 3.] The predicted concentration and recovery of diesel and gasoline obtained by SWATLD
    The predicted concentration and recovery of diesel and gasoline obtained by SWATLD
  • [FIG. 7.] The fitting lines between actual concentration and predicted concentration of diesel and gasoline. (a) R2 =0.9835, (b) R2 =0.9622.
    The fitting lines between actual concentration and predicted concentration of diesel and gasoline. (a) R2 =0.9835, (b) R2 =0.9622.
  • [FIG. 8.] Core consistency value of .
    Core consistency value of .
  • [FIG. 9.] The spectra of actual solution and SWATLD analyzed solution. (a) Fluorescence excitation spectra. The full lines represent the spectra of 3 components obtained by SWATLD algorithm; the imaginary lines represent the spectra of diesel, kerosene and gasoline respectively. (b) Fluorescence emission spectra. The full lines represent the spectra of 3 components obtained by SWATLD algorithm; the imaginary lines represent the spectra of diesel, kerosene and gasoline respectively.
    The spectra of actual solution and SWATLD analyzed solution. (a) Fluorescence excitation spectra. The full lines represent the spectra of 3 components obtained by SWATLD algorithm; the imaginary lines represent the spectra of diesel, kerosene and gasoline respectively. (b) Fluorescence emission spectra. The full lines represent the spectra of 3 components obtained by SWATLD algorithm; the imaginary lines represent the spectra of diesel, kerosene and gasoline respectively.
  • [TABLE 4.] The predicted concentration and recovery of diesel, gasoline and kerosene obtained by SWATLD
    The predicted concentration and recovery of diesel, gasoline and kerosene obtained by SWATLD
  • [FIG. 10.] The fitting lines between actual concentration and predicted concentration for diesel, gasoline and kerosene. (a) Diesel:R2=0.9536, (b) Gasoline:R2=0.9107, (c) Kerosene : R2=0.9646.
    The fitting lines between actual concentration and predicted concentration for diesel, gasoline and kerosene. (a) Diesel:R2=0.9536, (b) Gasoline:R2=0.9107, (c) Kerosene : R2=0.9646.