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Quick detecting method of illegal cooking oil

A technology for rapid determination and waste oil, applied in the direction of chemical analysis by titration, can solve the problems of economic and time can not meet the requirements, and achieve the effect of low cost and high efficiency

Inactive Publication Date: 2011-08-17
SHANGHAI JINXIN INSPECTION TECH
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Problems solved by technology

According to the usual detection method of edible oil, it can not meet the requirements in terms of economy and time.

Method used

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Embodiment Construction

[0015] The present invention is further described below.

[0016] The invention provides a kind of rapid determination method of waste oil, comprising the following steps:

[0017] Step 1. Use 95% CP-grade ethanol to mix with pure water or CP-grade ether at a ratio of 1:1 to form a mixture;

[0018] Step 2. Take 10ml of the above mixed solution and pour it into a glass test tube;

[0019] Step 3. Drop 0.25ml of the prepared 1% phenolphthalein indicator solution into the glass test tube and shake well;

[0020] The above-mentioned 1% concentration of phenolphthalein indicator solution is prepared by dissolving 1 gram of phenolphthalein indicator in 99ml of ethanol solution of 95% solution;

[0021] Step 4. Slightly drop the sodium hydroxide solution with a concentration of 0.01mol / L into the glass test tube until the liquid in the glass test tube is pink, and stop the dripping;

[0022] The above steps 1-4 can be pre-prepared in the laboratory for use;

[0023] Step 5. Add ...

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Abstract

The invention discloses a quick detecting method of illegal cooking oil, comprising the steps of injecting 10 ml of mixed solution of ethanol and water or ethyl ether; adding a phenolphthalein indicator solution with a concentration of 1% to a glass test tube; dropping a sodium hydroxide titrant with a concentration of 0.01 mol / L to a test tube so that the liquid is pink; adding oil to be detected to the glass test tube to be uniformly shaken so that the pink color of the solution fades and has no color; dropping the sodium hydroxide titrant to the test tube again until the solution becomes pink again; recording the volume of the sodium hydroxide titrant at this time; and if the volume of the sodium hydroxide titrant is more than 14 ml, showing that the acid value of the detected oil is higher than 4 and the detected oil is not qualified. The quick detecting method of the illegal cooking oil, disclosed by the invention, has the advantages of low cost and high efficiency; and the quick detecting method of the illegal cooking oil can be used for quickly distinguishing the illegal cooking oil and is simple and practical.

Description

technical field [0001] The invention relates to a rapid assay method, in particular to a rapid assay method for waste oil. Background technique [0002] Waste oil refers to the leftovers that have been eaten after cooking, and are extracted by filtering, stratifying, decolorizing and other methods. It is difficult to distinguish this oil from the edible oils on the market in appearance, but due to high-temperature cooking and long-term exposure to air, its physical and chemical properties have changed greatly compared with edible oils . If it is still used as edible oil and flows into the market, it will definitely cause great harm to the health of the eaters. Distinguish by the detection method of common edible oil, then all can't meet the requirement economically and in time. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for quickly and easily identifying waste oil. As edible oil is oxidized thro...

Claims

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Application Information

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IPC IPC(8): G01N31/16
Inventor 陈经国
Owner SHANGHAI JINXIN INSPECTION TECH
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