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Method for fast detecting low-content mineral oil in edible oil and fat

A detection method and edible oil technology, which are applied in chemical analysis by precipitation, material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, etc., can solve the complicated operation process of saponification. Fluorescence method equipment costs are high, can not meet the supervision and management problems, achieve good application prospects, easy operation, overcome time-consuming and labor-intensive effects

Inactive Publication Date: 2006-05-17
HENAN UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

However, the equipment cost of the fluorescence method is high, and the detection results are extremely unsatisfactory; while the saponification method has a complicated operation process and a long detection time, which cannot meet the needs of on-site supervision and management of edible oil sales and transportation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) prepare strong alkali solution: 60% KOH solution (m / m) and 60% NaOH solution (m / m) are made into mixed solution by the volume ratio of 1: 1; (2) in clean triangular flask (also can Select another container) to add 1.5ml of the oil sample to be tested, then add an equal volume of strong alkali solution and 50ml of 95% ethanol; (3) heat and shake in a boiling water bath at 100°C for 10min; (4) add 30ml of boiling water, and observe Phenomenon.

[0021] Oil samples containing mineral oil appeared cloudy by visual inspection.

[0022] Without mineral oil, cloudiness will not occur.

Embodiment 2

[0024] (1) prepare strong alkali solution: 60%NaOH solution (m / m); (2) add the oil sample of 0.1ml in the clean Erlenmeyer flask, then add the strong alkali solution of equal volume and the dehydrated alcohol of 20ml; ( 3) Heat and shake in a hot water bath at 80°C for about 30 minutes; (4) Add 15ml of boiling water and observe the phenomenon; (5) Measure the absorbance of the liquid after adding boiling water by turbidity method.

[0025] The presence and content of mineral oil can be accurately determined by quantifying standard samples by turbidimetry.

Embodiment 3

[0027] (1) Prepare strong alkali solution: 60% KOH solution (m / m); (2) Add about 0.5ml of oil sample into a clean Erlenmeyer flask, then add an equal volume of strong alkali solution and 30ml of 95% ethanol; (3) Heat and shake in a hot water bath at 85°C for 5 minutes; (4) Add 20ml of boiling water and observe the phenomenon;

[0028] Oil samples containing mineral oil appeared cloudy by visual inspection.

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Abstract

The present invention relates to a quick detection method of low-content mineral oil in edible oil. Said method includes the following steps: (1), using 0.1-2 ml of oil sample to be detected, adding isometric alkaline solution whose concentration is above 60% in a container, mixing them; (2), then adding ethyl alcohol whose concentration is above 95% and whose added quantity is 20-40 times said mixed solution; (3), placing said container in a hot water bath with 80 deg.C-100 deg.C, heating and shaking; and (4) adding boiling water and visually inspecting, if said solution produce cloudy phenomenon, it can judge that in the edible oil the mineral oil is contained.

Description

technical field [0001] The invention relates to a detection method for the content of oils and fats, in particular to a rapid detection method for low-content mineral oil in edible oils and fats. By using the method, it is possible to quickly identify whether the edible oils and fats contain mineral oil and the content of low-content mineral oil. Background technique [0002] Quality accidents that edible oils and fats are polluted by industrial gasoline, kerosene, diesel oil and other mineral oils occur from time to time. After investigation, the reasons for the pollution are: the use of No. 6 solvent oil contaminated by mineral oil in the oil processing; the use of edible oil in barrels with residual mineral oil; artificial adulteration and other reasons. [0003] Mineral oil mainly refers to paraffin, liquid paraffin, white oil and other oily substances extracted from petroleum. Consuming edible oil contaminated by mineral oil will cause harm to human health. Medical inf...

Claims

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Application Information

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IPC IPC(8): G01N21/82G01N31/02
Inventor 毕艳兰杨国龙卢奎李潇颖肖新生李东锐彭元怀
Owner HENAN UNIVERSITY OF TECHNOLOGY
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