礦物油三維熒光光譜的實驗數(shù)據(jù)分析方法研究
[Abstract]:Among the many causes of the increasingly serious pollution of the earth's water sources, mineral oil is the most serious water pollution and the most difficult to manage and monitor. Therefore, accurate and efficient detection of mineral oil content in water is of great value in maintaining the sustainable development of human and environment. Because of the advantages of high precision and high selectivity, fluorescence spectroscopy has become the main method for the detection of mineral oil pollutants. In this study, we analyzed the fluorescence spectrum characteristics of ordinary kerosene and diesel oil in general, and some problems limiting the sensitivity of fluorescence analysis, such as the instrument response of spectrometer. The effects of noise from photomultiplier tubes and Rayleigh scattering from carbon tetrachloride solvents on the fluorescence spectra were investigated. Parallel factor analysis and three-dimensional fluorescence spectroscopy were combined to detect and analyze mineral oil mixture. In order to reduce the influence of noise, scattered light and other uncorrelated signals in the fluorescence spectrum, the spectral signals were pretreated. The influence of the instrument response of the fluorescence spectrometer is eliminated by spectrum correction experiment, and the three dimensional fluorescence spectrum data are de-noised by wavelet transform. The smooth filtering of high frequency signal generated by photomultiplier tube is realized, and the Rayleigh scattering light is removed by using blank deduction method. Using carbon tetrachloride solvent to dilute the standard solution of mineral oil, the three dimensional fluorescence data of each sample were obtained by using Hitachi F-7000 fluorescence photometer. Parallel factor analysis was used to decompose and calculate the spectra of the three mineral oil mixtures. The results show that the parallel factor analysis method can achieve serious spectral overlap. Rapid component identification and accurate determination of concentrations of major substances of the same or similar composition of mineral oil mixtures.
【學(xué)位授予單位】:華北理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:X52;O657.3
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