Method for electrochemical detection of total urushiol content of raw lacquer

A measurement method, electrochemical technology, applied in the direction of material electrochemical variables, test sample preparation, etc., to achieve the effect of cheap analytical instruments, good selectivity, high reliability and accuracy

Inactive Publication Date: 2012-12-19
XI'AN PETROLEUM UNIVERSITY
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  • Description
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Problems solved by technology

Electrochemical voltammetry can directly measure substances with electroactive groups, and has the characteristics of high sensitivity, good selectivi...

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  • Method for electrochemical detection of total urushiol content of raw lacquer
  • Method for electrochemical detection of total urushiol content of raw lacquer

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Embodiment Construction

[0018] The present invention is described in detail below in conjunction with accompanying drawing.

[0019] The water used in the experiment was twice distilled water, and the reagents used in the experiment were of analytical grade.

[0020] Step 1. Mix spectrally pure graphite powder and liquid paraffin in a mortar with a mass ratio of 4:1, grind it into a uniform paste, fill it into a plastic tube with a diameter of 3.0mm and press it tightly, and use a copper wire as a wire to obtain Carbon paste electrode CPE, the surface of CPE is ground and polished on weighing paper, and stored at room temperature;

[0021] Step 2. Use CPE as the working electrode, a saturated calomel electrode as the reference electrode, and a platinum wire electrode as the counter electrode to form a three-electrode system. The three-electrode system is placed in a sodium hydroxide solution with a pH of 12.0. Perform multiple cyclic voltammetry scans on the electrochemical workstation, the scan vol...

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Abstract

The invention discloses a method for electrochemical detection of total urushiol content of raw lacquer. The method is characterized in that a carbon paste electrode is used as a working electrode; the carbon paste electrode, a saturated calomel electrode and a platinum wire electrode compose a three-electrode system; and total urushiol content of raw lacquer is detected by a cyclic voltammetry or a linear sweep voltammetry. Urushiol is a derivative of catechol and produces a pair of oxidation and deoxidization peaks in a NaOH solution having a pH value of 12.0 on the carbon paste electrode, and oxidation peak current values are proportional to urushiol concentrations in a certain range. The method can be used for direct detection of total urushiol content of raw lacquer and has the advantages of high sensitivity, good selectivity, fast analysis rate and low instrument price.

Description

technical field [0001] The invention relates to a method for measuring urushiol, in particular to an electrochemical method for measuring the total amount of urushiol in raw lacquer. Background technique [0002] Raw lacquer is the colloidal liquid secreted by the sumac tree, which is a kind of natural paint. The paint film of raw lacquer is hard and glossy, and has excellent properties such as corrosion resistance, heat resistance, wear resistance, acid resistance, water resistance, and insulation. Its chemical composition is mainly urushiol, in addition, it also contains laccase, gum and water. The content of urushiol in raw lacquer directly affects the film-forming performance of raw lacquer, and is an important indicator for evaluating the quality of raw lacquer. Therefore, the determination of urushiol content in raw lacquer is of great significance. The chemical structure of urushiol is a mixture of catechol derivatives with aliphatic hydrocarbon substituents of dif...

Claims

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Application Information

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IPC IPC(8): G01N27/48G01N1/28
Inventor 郑莉张文张瑞琴
Owner XI'AN PETROLEUM UNIVERSITY
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