| Polycyclic Aromatic Hydrocarbons (PAHs) are one kind of persistent organic pollutants (POPs) which distributed widely in the environment, is an important component of the oil. In recent years, oil pollution caused by the increasing pollution of soil PAHs, Quickly determine how the oil pollution of soil, for the quantitative determination of follow-up and repair efficiency is an urgent problem. In this paper, polycyclic aromatic hydrocarbons and petroleum products were three-dimensional fluorescence and synchronous fluorescence spectral characteristics based on the conclusion of each pollutant broad wavelength range, the fingerprint of the initial determination, according to the peak position, peak number and fluorescence intensity to qualitatively determine the material type of soil pollution and suffer the degree of pollution, so as to establish a rapid identification method of oil-contaminated soil.Analysis of polycyclic aromatic hydrocarbons in different combinations of single substances and mixed materials by three-dimensional fluorescence spectroscopy and synchronous fluorescence, initially identified characteristic patterns, The results showed homologues Ring and three-dimensional fluorescence excitation / emission wavelength (λEx /λEm) of the peak range of (220.0~305.0)/(300.0~345.0), three-ring and its homologues in the range of (235.0~285.0)/(345.0~465.0); for synchronous fluorescence spectra of polycyclic aromatic hydrocarbons, the Philippines has five major fluorescence peaks which were 300.2nm, 323.2nm, 337.4nm, 345.6nm, 373.6nm, naphthalene, pyrene, acenaphthene, fluorene, fluoranthene have only one peak at 311.4nm, 365nm, 315nm, 300nm, 400nm department. The same method to analyze the different brands of petroleum products (oil, diesel, gasoline, kerosene) in the three-dimensional fluorescence and synchronous fluorescence spectra, fluorescence spectra of petroleum products was found only associated with oil, but has nothing to do with manufacturers. Analysis of three-dimensional fluorescence spectra of petroleum products was found, are both heavy oil and diesel oil have three peaks, (270.0-275.0) / (310.0-315.0), 235.0 / (330.0-340.0), (205.0-210.0) / (290.0-295.0); is in the quality of diesel oil has five peaks, there are(255.0-265.0) / 285.0,255.0 / (380.0-385.0), 255.0/405.0, 230.0 / (335.0-340.0), 225.0 / 290.0; indicate the light oil, kerosene has four peaks, were 270.0/290.0, 270.0/320.0, 225.0/325.0, 215.0/290.0; the range of synchronous fluorescence peaks of lubricating oil, diesel, gasoline, kerosene were 271~380nm, 270~375nm, 264~340nm, 265~320nm respectively.Taking a venue for the case of oil pollution, collection site and the surrounding surface soil samples, with n-hexane as solvent extraction using accelerated solvent extraction of polycyclic aromatic hydrocarbons in the soil (PAHs), of the three-dimensional fluorescence and synchronous fluorescence spectra, and with more aromatic hydrocarbons and petroleum products, the corresponding feature map comparison, the results show that: the site has already been significant oil pollution. Three-dimensional fluorescence spectra show that the number of samples are the excitation / emission wavelength (λEx /λEm) to (235.0 ~250.0) / (345.0 ~ 365.0) and (325.0 330.0) / (375.0 ~ 385.0) range with two peaks, the former is the third ring PAHs and its homologue peaks, namely, the quality characteristic peak oil; the latter is heavy oil peaks. Synchronous fluorescence analysis also shows that at 340nm, and 360nm wavelength of heavy oil there is two peaks, the main pollutant is the Philippines, and flexion. The results show that fluorescence analysis can be effectively and quickly determine whether the petroleum- contaminated soil, and soil pollution caused by the type of petroleum products. |
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