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A kind of detection method of oil peroxide value
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A peroxide value and detection method technology, which is applied in the direction of chemical reaction analysis of materials, color/spectral characteristic measurement, etc., can solve problems such as lack of detection accuracy, and achieve high thermal stability and radiation resistance.
Active Publication Date: 2018-04-06
TIANJIN UNIV OF SCI & TECH
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[0004] Patent CN 102706872 A discloses a method for detecting oil by oxidation-reduction method. After the oxidation-reduction reaction produces complexes, the complexes are detected by colorimetry, and the detection accuracy is lacking.
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Embodiment 1
[0024] Standard curve creation
[0025] (1) Take 0.54g of ferrocene and dilute to volume in a 100ml volumetric flask. This solution is A liquid.
[0026] (2) Weigh 0.1g of cumene hydroperoxide to a constant volume in a 10ml volumetric flask, and use this solution as the mother liquor, then take 1ml of the mother liquor into a 20ml colorimetric tube, add 9ml of isopropanol and 0.5ml of formic acid (reaction in acidic conditions Next, adjust the pH value), after mixing, this solution is B solution.
[0027] (3) Take 1ml of solution A and 1ml of solution B and dilute to 5ml, heat at 50°C for 1 hour, cool down, and use isopropanol reagent as a blank to adjust to zero.
[0028] (4) Take 6 colorimetric tubes, respectively, accurately transfer 0.0ml, 0.3ml, 0.5ml, 0.8ml, 1.0ml, 1.5ml of B solution into 20ml colorimetric tubes, add 1ml of A solution each, and constant volume to 5ml, heated at 50°C for 1 hour, and immediately transferred to a 1cm cuvette after the reaction was comple...
Embodiment 2
[0030] Sample testing:
[0031] (1) Take 0.5g of oil sample in a 10ml volumetric flask, add 0.5ml of formic acid (the reaction goes smoothly under acidic conditions, adjust the pH value), take 1ml in a 20ml colorimetric tube, then add 1ml of A solution, and set Make up to 5ml, make three parallels for each sample, heat at 50°C for 1 hour, and immediately transfer to a 1cm cuvette after the reaction is completed, use isopropanol reagent as a blank to adjust to zero, and measure the absorbance of each tube at a wavelength of 318nm .
[0032] (2) Substitute the measured light absorption value into formula 1 to calculate the peroxide value of the oil sample (ie the number of millimoles of cumene hydroperoxide contained in the oil sample).
[0033] Calculation formula for oil peroxide value:
[0034] (Formula 1)
[0035] The letters in the formula represent:
[0036] X, the peroxide value of oil (mmol / kg)
[0037] A=0.1101 B=0.2553
[0038] Y, represents the absorbance val...
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Abstract
The invention relates to a grease peroxide value detection method. The method comprises that 1, excess ferrocene solution and cumyl hydroperoxide in oil undergo an oxidation and complexation reaction to produce a complex, and 2, a concentration of the complex is detected by a spectrophotometric method. The oxidized complex is stable. Oxygen in a solution prepared by an international method (ferricrhodanate method) can influence the determination result. Iron ions can cause pollution. New prepared ferrous chloride is used. An experiment process is carried out in dark because oxygen in air and illumination can influence a baseline value so that result accuracy is influenced. After the complete reaction, the reaction product is stood at a room temperature for some time and the detection result is not changed basically.
Description
technical field [0001] The invention belongs to the technical field of oil detection, in particular to a method for detecting the peroxide value of oil. Background technique [0002] Although the peroxide produced by the oxidation of oil is colorless, odorless and non-toxic, it has little effect on the quality of oil. However, peroxides are very unstable and are easily decomposed into many secondary oxidation products, such as aldehydes, ketones, alcohols, etc., some of which are harmful to the human body. Therefore, it is necessary to determine the peroxide value of oil. If the peroxide value is greater than 800meq / kg, it indicates that the oil is severely oxidized, the quality has changed, and it is toxic to the human body. Oil plays an important role in the taste, flavor and physical properties of food, and the quality of oil affects the quality and safety of oily food. [0003] At present, the iodometric method is commonly used. The iodometric method is accurate and l...
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