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Method for carrying out illegal cooking oil detection by using ultraviolet spectroscopic analysis method

An ultraviolet spectrum and analysis method technology is applied in the field of waste oil detection by using the ultraviolet spectrum analysis method, which can solve the problems of expensive detection methods, low specificity of waste oil detection results, and inability to be practically applied, and achieves rapid identification, simple method effect

Active Publication Date: 2013-02-13
SUZHOU PI PRECISION INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for detecting waste oil using ultraviolet spectrum analysis method, which solves the problems in the prior art that the detection result of waste oil is not high in specificity, the detection method is expensive and cannot be practically applied, etc.

Method used

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  • Method for carrying out illegal cooking oil detection by using ultraviolet spectroscopic analysis method
  • Method for carrying out illegal cooking oil detection by using ultraviolet spectroscopic analysis method
  • Method for carrying out illegal cooking oil detection by using ultraviolet spectroscopic analysis method

Examples

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Effect test

Embodiment 12-21

[0041] Example 12-21# Detection of 4 oil samples of Xinjiang finished waste oil

[0042] 1. The instrument used

[0043] In this embodiment, an ultraviolet spectrum analyzer—ultraviolet spectrum analyzer (micro) is used. Ultraviolet spectrum analyzer (mini) can directly analyze the data / graphic absorbance value of the spectrum from 185nm to 800nm. The UV analyzer is effective for the analysis of olefins and benzene ring organics containing conjugated structures, and can perform scientific qualitative and quantitative analysis. Therefore, the use of a micro-ultraviolet spectrometer for ultraviolet spectrophotometric analysis can scientifically analyze the ultraviolet absorption status of the polar components in the waste oil. For high-quality edible vegetable oil, its polar components are relatively small, and its UV absorption is also weak. The two show obvious differences. The UV spectrum curve trend of the computer graphic of the instrument is different, and it can be used to...

Embodiment 2

[0074] Example 2 Detection of oil sample of Qianmendigou 3

[0075] (1) Sample processing

[0076] The waste oil sample in this example is the suspected waste oil collected from Qianmen, numbered Qianmen waste 3; it is divided into 3 types of oil samples to be tested, of which 30# Qianmen waste 3+ rapeseed oil 10% is 1 part (volume ) Qianmen Digou Oil 3 mixed with 9 parts (volume) rapeseed oil; 15# Qianmen Digou 3+ 20% rapeseed oil is 1 part (volume) Qianmen Digou oil 3 and 4 parts (volume) rapeseed 02#Qianmen Digou 3 + 50% rapeseed oil is 1 part (volume) Qianmen Digou Oil 3 mixed with 1 part (volume) rapeseed oil. The standard normal oil product uses peanut oil available on the market. The mixed oil product is blended with 4 parts (volume) of normal soybean oil, rape oil, sunflower oil, peanut oil, and corn oil, and 1 part of standard biodiesel (volume).

[0077] Add isooctane or n-hexane for dilution, and the volume ratio of isooctane or n-hexane to the oil sample to be tested i...

Embodiment 3

[0086] Example 3 Detection of mixed oil sample of Guangzhou Digou 2 and mixed oil

[0087] (1) Sample processing

[0088] The sample to be tested in this example is a suspected waste oil collected from Guangzhou, numbered Guangzhou Digou 2; it is divided into 3 types of oil samples to be tested, of which 02# Guangzhou Digou 2 + 10% mixed oil is 1 part (volume) Guangzhou Digou 2 Blended with 9 parts (volume) of mixed oil; 01#广州地沟2+ 20% mixed oil is 1 part (volume) of Guangzhou Digou 2 and 4 parts (volume) of mixed oil; 07# 广州地沟2 +50% mixed oil is a blend of 1 part (volume) of Guangzhou Digou 2 and 1 part (volume) of mixed oil. The mixed oil is made by blending 1 part (volume) each of blended oil, soybean oil, and peanut oil.

[0089] Add isooctane or n-hexane for dilution, and the volume ratio of isooctane or n-hexane to the oil sample to be tested is 2:1. Add the diluted sample to be tested according to the required dose into a prepared glass test tube containing a water extractio...

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Abstract

The invention discloses a method for carrying out illegal cooking oil detection by using an ultraviolet spectroscopic analysis method. The method comprises the steps that: (1) an oil sample to be detected is subjected to pretreatment; (2) a standard curve is drawn by using a substrate standard addition method; a mixed oil product and a standard normal oil product are respectively pretreated by using the method provided by the step (1), and are scanned by using an ultraviolet spectrum colorimetric analysis method at wavelengths of 200-320nm; aqueous solution spectral absorption diagrams of the two samples are drawn and are adopted as standard curves of the two which are detection limits of illegal cooking oil detection; (3) a micro-emulsion liquid of oil in water molecules (W / O) is scanned by using an ultraviolet spectrum colorimetric analysis method at wavelengths of 200-320nm; an aqueous solution spectral absorption diagram of an oil sample to be detected is drawn; and whether the detected oil sample is illegal cooking oil is determined according to absorption value volume, spectral characteristics curve, and curve graphic similarity of the aqueous solution spectral absorption diagrams. Through many tests and validations, the success rate of the method can substantially reach 70-80%.

Description

Technical field [0001] The invention belongs to the technical field of food safety detection, and specifically relates to a method for detecting waste oil by adopting an ultraviolet spectrum analysis method. Background technique [0002] Waste oil generally refers to all kinds of low-quality oils that exist in life, such as recycled cooking oil and repeatedly used frying oil. The largest source of waste oil is grease traps in the sewers of large urban restaurants. Long-term consumption may cause cancer, which is extremely harmful to the human body. At present, there is no uniform standard for testing waste oil in China. In the current national mandatory standard "Hygienic Standard for Edible Vegetable Oils" (2716-2005), the physical and chemical indicators of edible oils include acid value, peroxide value, solvent residues in the leaching oil, free phenol (cottonseed oil), total arsenic, and lead. There are 9 indicators in total, aflatoxin, benzopyrene, and pesticide residues,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 宗群
Owner SUZHOU PI PRECISION INSTR
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