Method for rapid detection of waste oil based on laser-induced breakdown spectroscopy

Abstract

The invention discloses a method for rapid detection of waste oil based on laser-induced breakdown spectroscopy. The method comprises the following steps that: step A, laser beams of a laser output system are focused on the surface of grease to be detected through lenses so as to allow the surface of the grease to be detected to form plasma plume and to glow; step B, laser-induced breakdown spectroscopic LIBS signals of the grease to be detected are transmitted to a spectrum measurement system through a signal collection system; step C, the spectrum measurement system compares measured spectroscopic data with laser-induced breakdown spectroscopic LIBS data of every element in a database, and information about varieties and contents of metal elements in the grease to be detected and analytical data of related information about contents of carbon, nitrogen, oxygen and compounds thereof are parsed according to spectral line positions and spectral line intensity; and step D, a computer system compares the analytical data with the data of a normal grease sample in the database so as to determine the quality of the detected grease sample.

Description

technical field [0001] The invention relates to the field of oil detection. The metal ion content in waste oil is much greater than that in edible oil, and the waste oil contains some metal ions that are not in edible oil. The invention particularly relates to a method for rapid detection of waste oil based on laser-induced breakdown spectroscopy. The invention mainly detects the content of metal ions, carbon, nitrogen, oxygen and their compound components in the oil by laser-induced breakdown spectroscopy technology and their correlation to identify the quality information of the oil. Background technique [0002] Edible oil is a necessity in people's daily life, and the quality of the oil is closely related to the health status of the public. Nowadays, driven by economic interests, some unscrupulous merchants use waste oil to produce gutter oil, and pretend to be edible oil to re-flow into the food market and sell it to consumers. This illegal behavior seriously endangers...

AI Technical Summary

Problems solved by technology

[0007] 2. Conductivity measurement method. Grease is a non-conductive substance. Experimental data show that the conductivity of hogwash oil is extremely high. The reason is that hogwash oil has added some easily ionized substances such as salt and monosodium glutamate during cooking. In addition, waste oil will interact with air, metal, moisture, microorganisms, etc. during the collection, refining, and processing processes, thereby increasing the conductivity of waste oil. However, studies have shown that the conductivity detection method can only be used for hogwash oil in edible oils. Detection of content reaching more than 20%

In these methods, many experimental instruments are very complicated, the steps are very cumbersome, the detection time is long, and the fast online detection task cannot be completed.

The sensitivity of some methods is very limited, and they are not suitable for the proof work of public security organs

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