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Electrochemical method for measuring oxidation inducing time of grease

A technology of induction time and oil oxidation, applied in the fields of analytical chemistry and oil analysis and detection, it can solve the problems of large experimental error, low sensitivity, poor oil conductivity, etc., and achieve the effect of simple method and high sensitivity

Active Publication Date: 2016-08-24
JIANGNAN UNIV
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Problems solved by technology

[0006] The conductivity of grease is poor, and the impedance change caused by the oxidation process of grease is relatively small. When measuring impedance with a bare glassy carbon electrode, the sensitivity is low and the experimental error is large.

Method used

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  • Electrochemical method for measuring oxidation inducing time of grease
  • Electrochemical method for measuring oxidation inducing time of grease
  • Electrochemical method for measuring oxidation inducing time of grease

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Embodiment Construction

[0023] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0024] An electrochemical method for measuring the oxidation induction time of grease, the steps are as follows, (1): the glassy carbon electrode is successively filled with 0.3 and 0.05 μm Al 2 o 3 The powder is ground on the buckskin until the electrode surface is as bright as a mirror. Sonicate with absolute ethanol and ultrapure water for 5 min in turn, and dry at room temperature for later use. (2): Place the treated glassy carbon electrode in 1.0g / L graphene, 0.05mol / L NaCl suspension, pass N 2 Deoxygenation. The saturated calomel electrode was used as the reference electrode, and the platinum sheet electrode was used as the counter electrode. Using cyclic...

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Abstract

The invention discloses an electrochemical method for measuring the oxidation inducing time of grease. The electrochemical method comprises the steps of to reducing graphene suspension by using electrodeposition to prepare a graphene-modified electrode; diluting supporting electrolyte solution for the grease to be measured, adding diluent into an electrolytic tank to form a three-electrode system (the working electrode is the graphene-modified electrode, the counter electrode is a platinum sheet and the reference electrode is a calomel electrode), adjusting disturbance voltage and frequency, measuring and recording an alternating-current impedance spectrum; solving an impedance value of solution by an equivalent circuit of the impedance spectrum; and solving the oxidation inducing time of the grease accurately by a double-tangent method. The electrochemical method disclosed by the invention has the advantages that the change of the impedance value in the process of grease oxidation can be quickly and accurately measured by the graphene-modified glass-carbon electrode, so that an electrochemical method for measuring the oxidation inducing time of the grease in a simple-sensitive-accurate manner is established.

Description

technical field [0001] The invention relates to an electrochemical method for measuring fat oxidation induction, which belongs to the technical field of fat analysis and detection in the field of analytical chemistry. Background technique [0002] The process of oil autoxidation is very complicated, and its change process is mainly divided into three parts: induction period, development period and termination period. The induction period is a slow process, in which the oil is oxidized to produce peroxides, and in the next development period, the peroxides are decomposed to produce free small molecules such as aldehydes and ketones. The time between the induction period and the development period of oil auto-oxidation (oxidation induction time) is closely related to the antioxidant capacity of oil, that is, the oxidation stability of oil. Therefore, the oxidation stability of oil can be evaluated by measuring the oxidation induction time of oil. [0003] At present, the com...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/26
Inventor 朱振中王艇闵欣
Owner JIANGNAN UNIV
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