Test method for identifying cooking oil mixed with hogwash oil

A detection method and waste oil technology are applied in the field of edible vegetable oil detection and safety, and can solve the problems of inaccurate detection, long digestion time, and large amount of acid added.

Inactive Publication Date: 2011-09-07
CENT LAB TIANJIN ACADEMY OF AGRI SCI
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  • Abstract
  • Description
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Problems solved by technology

Among them, wet digestion needs to add mixed acid, the amount of acid added is relatively large, the digestion time is long, and the reagent blank is high; microwave digestion has a fast digestion speed, but there are certain requirements for

Method used

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  • Test method for identifying cooking oil mixed with hogwash oil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weigh 5g of refined gutter oil sample (accurate to 0.001g) and place it in a porcelain crucible, add 5ml of nitric acid, first carbonize on an adjustable electric heating plate on a low heat until there is no smoke, and then transfer it to a muffle furnace at 550°C Turn to off-white, dissolve the ash with 0.5mol / L nitric acid, and transfer to a 25ml colorimetric tube.

[0025] (2) After the colorimetric tube was fixed to the scale, the content of the main heavy metal elements was measured by an inductively coupled plasma mass spectrometer. (measured results: see Table 1)

Embodiment 2

[0027] (1) Weigh 5g of refined waste oil samples (accurate to 0.001g) and place them in a porcelain crucible, add nitric acid, carbonize to smokeless, and then move into a muffle furnace to ash at 600°C to off-white; wherein the sample to be tested and nitric acid The weight to volume ratio is 1:1-1.2.

[0028] (2) Dissolve the ash with 0.8mol / L dilute nitric acid, transfer to the 25ml colorimetric tube, after the colorimetric tube is constant to the scale, measure the content of its main heavy metal elements with an inductively coupled plasma mass spectrometer (measured Results: See Table 1).

Embodiment 3

[0030] Comparative test:

[0031] Sample to be tested: a sample of refined waste oil mixed with 5% mass fraction of reasonable edible oil.

[0032] Wet digestion method: add concentrated nitric acid and perchloric acid 4:1 (volume ratio) 8ml, if the digestion is not clear and transparent, continue to add concentrated nitric acid, so the amount of acid added in this method is relatively large, the digestion time is long, and the reagent blank is relatively high , which is not conducive to measurement.

[0033] Detection situation: First, the acid value, iodine value, peroxide value and other indicators of the sample were measured, and it was found that it was impossible to distinguish whether it was mixed with waste oil.

[0034] The minimum amount of detection: Since the oil is difficult to digest, the sample weight in wet digestion is low. After the digestion is complete, the dilution factor of the sample is enlarged after constant volume, and only samples with high heavy me...

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Abstract

The invention relates to a test method for identifying cooking oil mixed with hogwash oil. The method comprises the following steps: precisely weighing a sample and placing the sample into a porcelain crucible, adding nitric acid, carbonizing on an adjustable electric hot plate with soft fire till no smoke comes out, and then transferring to a muffle and ashing to off-white at 550 DEG C, wherein the bulking value ratio of nitric acid to the sample to be tested is 1:1; dissolving ash content with 0.5mol/L nitric acid, transferring to a 25ml colorimetric tube, adjusting the constant volume of the colorimetric tube to a scale value, and testing the contents of main heavy metal elements by using an ICP-MS (inductively coupled plasma mass spectrometer). By comparing the tested results, whether the sample is mixed with hogwash oil can be identified. The ICP-MS method can test almost all elements in cooking oil and has higher sensitivity; meanwhile, by the method, samples of cooking oil with a low content of hogwash oil also can be exactly tested.

Description

technical field [0001] The invention belongs to the technical field of edible vegetable oil detection and safety. It involves the analysis method of whether cooking oil contains gutter oil components. More specifically, it is a method for determining whether edible vegetable oil is mixed with waste oil by using nitric acid carbonization ashing method and inductively coupled plasma mass spectrometry. Background technique [0002] my country is the country with the largest consumption of vegetable oil in the world, and the output of waste oil is increasing year by year. Due to the considerable economic temptation, some people still take risks to sell waste oil. It is very harmful to society and food safety. Waste oil generally refers to all kinds of low-quality oils that exist in daily life. Long-term consumption may cause cancer and is extremely harmful to the human body. "Gutter oil" is also called "hog oil" by people in the industry. Its sources mainly include: greasy fl...

Claims

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Application Information

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IPC IPC(8): G01N27/62
Inventor 张强陈秋生刘烨潼殷萍孟兆芳张玺
Owner CENT LAB TIANJIN ACADEMY OF AGRI SCI
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