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Electrochemical method for simultaneous determination of tetrachlorocatechol and tetrachlorohydroquinone based on graphene/chitosan-modified electrode

A technology of tetrachlorocatechol and modified electrodes, which is applied in the field of electrochemical analysis to achieve the effects of good selectivity, good stability and environmental friendliness

Inactive Publication Date: 2013-04-24
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the similar oxidation potentials of tetrachlorocatechol and tetrachlorohydroquinone on the conventional glassy carbon electrode, the oxidation peaks of tetrachlorocatechol and tetrachlorohydroquinone overlap, which limits Its application to the simultaneous determination of tetrachlorocatechol and tetrachlorohydroquinone

Method used

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  • Electrochemical method for simultaneous determination of tetrachlorocatechol and tetrachlorohydroquinone based on graphene/chitosan-modified electrode
  • Electrochemical method for simultaneous determination of tetrachlorocatechol and tetrachlorohydroquinone based on graphene/chitosan-modified electrode
  • Electrochemical method for simultaneous determination of tetrachlorocatechol and tetrachlorohydroquinone based on graphene/chitosan-modified electrode

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Experimental program
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Effect test

Embodiment 1

[0033] A kind of electrochemical method for simultaneously measuring tetrachlorocatechol and tetrachlorohydroquinone based on graphene / chitosan modified electrode comprises the following steps:

[0034] 1. Preparation of graphene-chitosan suspension

[0035] a1: Measure 2.50 mL of 0.50 mg / mL graphene oxide dispersion, add 2.50 mL of twice distilled water, 20.00 μL of ammonia water, and 3.00 μL of hydrazine hydrate in sequence, vibrate vigorously, then place in a water bath at 98 °C, keep stirring for 80 min That is, the graphene suspension is obtained.

[0036] a2: Measure 1.00 mL of the above graphene suspension, add 30.00 μL of 3% chitosan, and sonicate for 30 min to obtain a stable graphene-chitosan suspension, which is sealed and stored for later use.

[0037] Select a small amount of prepared graphene-chitosan suspension to carry out the transmission electron microscope experiment, the gained transmission electron microscope picture is as follows figure 1 shown. From ...

Embodiment 2

[0051] Embodiment 2: the selection of buffer solution kind

[0052] According to the electrochemical determination method in the embodiment 1, three kinds in sodium acetate-acetic acid, B-R, sodium dihydrogen phosphate-citric acid (pH is 4.5) when comparing tetrachlorocatechol and tetrachlorohydroquinone coexist Electrochemical response in the buffer solution, it is found that the peak potential difference between tetrachlorocatechol and tetrachlorohydroquinone is not large in three buffer solutions, but the peak shape is the best in sodium acetate-acetic acid buffer solution, Therefore, it is recommended to choose sodium acetate-acetic acid (ie ABS) as the test base solution.

[0053]

Embodiment 3

[0054] Embodiment 3: the optimization of graphene-chitosan modifier dosage

[0055] According to the method of Example 1, graphene / chitosan modified electrodes with different graphene-chitosan modifier dosages (2-8 μL) were prepared, and the cycle voltage of tetrachlorocatechol and tetrachlorohydroquinone were studied respectively. The relationship between the oxidation peak current and the amount of graphene-chitosan modifier, when the amount of modifier is less than 5.00 μL, the peak current increases with the increase of the amount, and after more than 5.00 μL, the peak current gradually decreases, which may be Because the dosage increased continuously at the beginning, the enrichment efficiency increased, resulting in an increase in the peak current, and then with the increase in the amount of modification, the thickness of the modified film on the surface of the glassy carbon electrode continued to increase, thereby affecting the conductivity of the electrode. Therefore, ...

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Abstract

The invention discloses an electrochemical method for simultaneous determination of tetrachlorocatechol and tetrachlorohydroquinone based on a graphene / chitosan-modified electrode. The electrochemical method utilizes a graphene / chitosan-modified glassy carbon electrode as a working electrode and realizes simultaneous determination of tetrachlorocatechol and tetrachlorohydroquinone by the cyclic voltammetry and the differential pulse voltammetry. The glassy carbon electrode is modified by graphene and chitosan so that two isomers of tetrachlorocatechol and tetrachlorohydroquinone are subjected to electrochemical separation on the modified electrode and peak current intensity is large and thus simultaneous determination of tetrachlorocatechol and tetrachlorohydroquinone contents is realized by the direct electrochemical determination method.

Description

technical field [0001] The invention relates to the determination of chlorophenols in organic pollutants in the environment, in particular to an electrochemical method for the simultaneous determination of tetrachlorocatechol and tetrachlorohydroquinone based on a graphene / chitosan modified electrode, belonging to Electrochemical analysis technology field. Background technique [0002] Chlorophenols are important raw materials in industry and are widely used in the production of chemical products such as dyes, preservatives, insecticides and fungicides. However, chlorophenols and their derivatives are also discharged into the environment in the production process of petroleum-related industries, textiles, papermaking, printing and dyeing and many other industries. Chlorophenols are toxic, especially potentially carcinogenic, teratogenic and mutagenic, causing serious harm to the environment and human health. Their high solubility in water thus increases their potential for...

Claims

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Application Information

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IPC IPC(8): G01N27/48
Inventor 李卉卉赵永昕杨小弟许崇正
Owner NANJING NORMAL UNIVERSITY
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