Waste oil detection method based on specific components and broadband terahertz absorption spectroscopy
A technology of absorption spectrum and detection method, applied in the application field of terahertz technology, can solve the problems of low sensitivity, low precision, poor resolution, etc., and achieve the effect of high sensitivity, poor resolution and high resolution
Inactive Publication Date: 2017-07-14
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0012] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a waste oil detection method based on specific components and broadband terahertz absorption spectrum, which can solve the current problems of waste oil identification and the long time-consuming, sensitive Low, low precision, poor resolution and other problems, to achieve accurate, efficient, high sensitivity, high resolution and non-destructive testing of waste oil
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[0026] The present invention will be further described below in conjunction with accompanying drawing, wherein take the typical toxic and harmful component aflatoxin in waste oil as example as the specific component in waste oil, illustrate the specific implementation of the present invention, other typical toxic and harmful components such as The embodiment of benzopyrene and sodium dodecylbenzenesulfonate is the same as this embodiment.
[0027] When the components in the mixture are complex and the content of the substance to be analyzed is relatively small, the standard addition method is a good solution, which can overcome the difficulty of making a calibrated standard mixture. The schematic diagram of the standard addition method is shown in figure 1 As shown, in the figure y is the signal, such as the spectral absorption intensity; x is the concentration of the component to be analyzed in the mixture.
[0028] A method for detecting waste oil based on specific componen...
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The invention discloses a waste oil detection method based on specific components and broadband terahertz absorption spectrum. The method adopts typical toxic and harmful components in waste oil as specific components to identify waste oil, and at the same time adopts a standard addition method to carry out Quantitative analysis of the specific components in the oil sample to be tested, prepare a mixed solution of several oil samples to be tested and the standard solution of the specific component, measure the broadband terahertz absorption spectrum of the mixed solution, and calculate its corresponding second differential spectrum, using the correlation The analysis method determines the characteristics of the model data, and uses the least squares regression method to establish a relationship model between the characteristics of the model data and the concentration of the mixed solution, determines the content of the specific components in the oil sample to be tested, and compares it with the preset threshold value to determine the Whether the oil sample is waste oil; this method is suitable for the detection of trace substances in samples with complex components, especially for the accurate identification of waste oil, and has the characteristics of high sensitivity and easy preparation of calibration solutions.
Description
technical field [0001] The invention relates to a waste oil detection method, in particular to a waste oil detection method based on specific components and broadband terahertz absorption spectrum, belonging to the application field of terahertz technology. Background technique [0002] Waste oil is a general term for various inferior oils and fats. It is composed of swill oil in the catering industry, animal fat and frying oil that have been used more than the specified requirements. The collected mixture is coarsely filtered to obtain crude oil, and then heated to deodorize and Decolorize clay to get crude oil, and finally get refined waste oil through low-pressure deodorization and other steps. [0003] Although refined waste oil has no obvious difference in color and smell from normal edible oil, it has experienced high temperature, repeated frying and oxidation and corruption in sewer during the collection and processing process, resulting in aflatoxin, benzopyrene, Va...
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IPC IPC(8): G01N21/3577G01N21/3581
Inventor 曹丙花盛恒范孟豹孙彦景
Owner CHINA UNIV OF MINING & TECH