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Method for rapidly, simply and conveniently detecting illegal cooking oil

A detection method and technology for waste oil, which are applied to measurement devices, material analysis by electromagnetic means, instruments, etc., can solve problems such as short time consumption, and achieve the effects of accurate results, fast detection, and simple and convenient technology.

Inactive Publication Date: 2014-11-19
GUANGDONG INST OF APPLIED BIOLOGICAL RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide consumers and law enforcement personnel with a quick and easy detection method for waste oil that can be operated independently, which overcomes the shortcomings of the original technology such as complicated operation, and is more convenient to operate, less time-consuming, and high in accuracy , can be used for on-site operation to achieve rapid detection

Method used

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  • Method for rapidly, simply and conveniently detecting illegal cooking oil
  • Method for rapidly, simply and conveniently detecting illegal cooking oil
  • Method for rapidly, simply and conveniently detecting illegal cooking oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Determination of the conductivity (μs / cm) of ultrapure water.

[0023] The conductivity (μs / cm) of ultrapure water was measured with a conductivity pen, and the results are shown in Table 2.

[0024] Table 2 Conductivity of ultrapure water (μs / cm)

[0025] 1 2 3 4 5 average value Three function TDS pen 0 0 0 0 0 0 DDB-303 Conductivity Meter 1.0 0.9 1.0 1.0 0.9 0.96

[0026] *The conductivity pen used is the "three-function TDS pen" (water quality testing pen / conductivity pen) provided by Guangzhou Jingjian Water Purification Equipment Co., Ltd., and the DDB-303 conductivity meter is produced by Shanghai Jinhuan Instrument Co., Ltd. The same below.

Embodiment 2

[0027] Embodiment 2: Determination of conductivity (μs / cm) of nonionic surfactant in dehydrated ions.

[0028] The conductivity (μs / cm) of the nonionic surfactant in ultrapure water was measured with a conductivity pen, and the results are shown in Table 3.

[0029] Table 3 Conductivity of nonionic surfactants in ultrapure water (μs / cm)

[0030] AEO-5 Three function TDS pen DDB-303 Conductivity Meter 100 times* 17 16.7 200 times 8 9.2 400 times 3 5.4 800 times 1 3.3 1000 times 0 2.7 1500 times 0 2.1 2000 times 0 1.7 3000 times 0 1.5 4000 times 0 1.4 5000 times 0 1.0

[0031] *The dilution ratio of non-ionic surfactants in water, the same below.

Embodiment 3

[0032] Embodiment 3: the function test of nonionic surfactant in sample oil

[0033] (1) Conductivity of waste oil and ultrapure water mixture. According to the mixture of waste oil and ultrapure water, the mixing ratio is, waste oil: ultrapure water = 1:1, obtain the water phase below, and measure the conductivity (μs / cm) in the ultrapure water with a conductivity pen. Results The measurement values ​​of sample A in Table 4, where the waste oil comes from Sanshui, Foshan.

[0034] (2) Conductivity of waste oil and nonionic surfactant mixture. Mix waste oil with non-ionic surfactant. The waste oil comes from Huizhou. The surfactants are AEO5 and NP4 respectively. The mixing ratio is: waste oil:surfactant=19:1. Then, the mixed solution was diluted 50 times with ultrapure water, and the conductivity of the aqueous dispersion of the sample oil was measured. The results are shown in Table 4 as measured values ​​B and C.

[0035] Table 4 Effects of nonionic surfactants on sampl...

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Abstract

The invention discloses a method for rapidly, simply and conveniently detecting illegal cooking oil. The method comprises the following steps of adding a nonionic surfactant into a selected to-be-detected oil sample, adequately and uniformly mixing to form sample oil-nonionic surfactant mixed liquid, adding the sample oil-nonionic surfactant mixed liquid into deionized water to be emulsified so that sample oil-nonionic surfactant mixed liquid is uniformly dispersed to form milky white liquid, measuring the electrical conductivity of the milky white liquid, and comparing the electrical conductivity of the milky white liquid with electrical conductivity of the qualified edible oil measured under the same conditions, so as to judge whether the to-be-detected oil sample is the illegal cooking oil or not. The method for rapidly, simply and conveniently detecting the illegal cooking oil has the beneficial effects that (1) solvents, particularly chemical solvents such as methanol, diethyl ether or petroleum ether are not required; (2) the illegal cooking oil can be directly detected without layered processing or layered l extraction; (3) all small molecular substances of the illegal cooking oil are detected, so that a result is accurate; (4) the detection method is high in detection speed and is applicable to field detection; (5) the technique is simple and convenient and is suitable for the use of consumers of public families; (6) the technical accuracy is high, and a small amount of the illegal cooking oil mixed in the edible oil can be detected.

Description

Technical field: [0001] The invention belongs to the technical field of food safety detection, and in particular relates to a quick and simple detection method for waste oil. Background technique: [0002] Waste oil is of extremely poor quality, and its peroxide value, acid value, moisture, carbonyl value, malondialdehyde, aflatoxin B1 and other indicators seriously exceed the standard non-edible oil. Waste oil mainly has 3 kinds of sources: the one, the greasy floating matter in the sewer or the leftovers (commonly known as swill) of hotels and restaurants obtain after simple processing and refining, i.e. waste oil or swill oil in the narrow sense The second is the oil produced after processing and refining inferior pork, pig viscera, and pig skin; the third is the oil that does not meet the regulations after repeated frying or adding new oil to the repeatedly used oil, so it is called deep frying oil . Generally speaking, most of the waste oil refers to swill oil, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
Inventor 毛润乾郑基焕张宇宏郭洋洋肖英方
Owner GUANGDONG INST OF APPLIED BIOLOGICAL RESOURCES
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