Method for measuring grease oxidation induction time based on screen printing modified electrode

A modified electrode and screen printing technology, which is applied in the direction of measuring devices, electrochemical variables of materials, and material analysis through electromagnetic means, can solve the problems of high cost of glassy carbon modified electrodes, inability to prepare batches conveniently, and easy fall-off of modifiers. , to achieve the effect of convenient and fast production, simple method and simple preparation method

Active Publication Date: 2017-04-26
JIANGNAN UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to address the shortcomings of the existing measuring system and method for electrochemically measuring lipid hydroperoxide and oxidation induction time, such as the high cost of using glassy carbon modified electrodes, the inability to conveniently prepare batches, and the modification It is easy to fall off during the measurement process, the electrode is easily contaminated by the coexisting substances in the measurement system, and the commonly used reference electrode (such as saturated calomel electrode) and counter electrode (such as platinum wire electrode) affect the accuracy of the measurement results. A three-electrode measurement system with screen-printed modified electrodes was developed, which can quickly, conveniently and accurately measure the oxidation induction time of grease.

Method used

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  • Method for measuring grease oxidation induction time based on screen printing modified electrode
  • Method for measuring grease oxidation induction time based on screen printing modified electrode

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Embodiment 1

[0024] The construction of screen printing modified electrode, the steps are as follows, (1) carbon paste, graphene oxide and 1-butylpyridine hexafluorophosphate are added to an appropriate amount of carbon paste diluent (the mass ratio of carbon paste and graphene oxide is 125 : 1, the mass ratio of carbon paste and 1-butylpyridine hexafluorophosphate is 75: 1), ultrasonic, stirring and mixing, to obtain conductive paste; (2) print the silver paste on the surface of the printed substrate, put it into 90 ℃ Dry in an oven for 30 minutes; (3) print the conductive paste, and put it in a 90°C oven to dry for 30 minutes; (4) apply an insulating layer and dry it at room temperature; (6) Add an appropriate amount of graphite-phase carbon nitride into an appropriate amount of carbon slurry diluent to prepare a suspension with a concentration of 4 mg / mL, and ultrasonically disperse it; (7 ) Take 4 μL of the suspension and add it dropwise on the above-mentioned screen-printed electrode,...

Embodiment 2

[0027] Grease oxidation induction time measurement, the steps are as follows, (1) take 0.20g grease sample in ethanol:chloroform=20:3 (V:V) as solvent; (2) screen printing modification constructed in Example 1 Put the electrode into the electrolytic cell of the oil sample to be tested, and measure the impedance of the oil oxidation process; (3) measure the peroxidation value of the oil synchronously according to the national standard method; obtain the relationship curve of the oil impedance value and the peroxidation value with time; (4 ) Obtain the impedance value of the solution through the equivalent circuit of the impedance spectrum; (5) Use the double tangent method to the above curve with a double tangent, and the time corresponding to the intersection point is the oxidation induction time of the oil.

[0028] Depend on figure 2 It can be seen that the induction time of olive oil in a water bath at 80°C is 6.01h and 5.98h, respectively, by making double tangents to the...

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Abstract

The invention relates to a method for measuring grease oxidation induction time based on a screen printing modified electrode. The method comprises the following steps: carbon paste, silver paste, graphene, pyridine ionic liquid and carbonitride construct a screen printing modified electrode three-electrode measurement system; a support electrolyte solution is used for diluting to-be-measured grease, disturbance voltage and frequency are adjusted, AC impedance spectroscopy is measured and recorded; impedance value of the solution is obtained through an equivalent circuit of impedance spectroscopy; and through a bitangent method, the grease oxidation induction time can be obtained in a rapid, convenient and accurate mode. Compared with the current measurement method and the measurement system, the method has the advantages of simple process, convenient usage and low cost, enables on-site instant and accurate measurement of the grease oxidation induction time, and provides good base for automation and miniaturization for grease detection.

Description

technical field [0001] The invention relates to a method for measuring the induction time of grease oxidation based on a screen-printed modified electrode, and belongs to the technical fields of electrochemical analysis and grease analysis and detection in the field of analytical chemistry. Background technique [0002] Oil is a necessity of human life and is widely used in fields such as medicine, food, cosmetics and biofuel. The quality of oil has an important impact on production and life. Therefore, it is very important to correctly evaluate the oxidation stability of oils and fats. The change process of oil autoxidation is mainly divided into three parts: induction period, development period and termination period. The induction period time (oxidation induction time) is an important index to evaluate the oxidation stability of oils and fats. [0003] At present, the methods for evaluating the oxidation stability of oil mainly include thiobarbituric acid method (TBA),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 朱振中郑曼曼耿佳佳
Owner JIANGNAN UNIV
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