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Chemically modified carbon paste electrode as well as preparation method and application thereof

A carbon paste electrode and chemical modification technology, applied in the field of electrochemical analysis, can solve the problems that the detection limit is not low enough, can not meet the monitoring of surface water quality, hinder the commercial development of heavy metal ion carbon paste electrode, etc. The electrode is easy to update and the effect of reducing the volume

Active Publication Date: 2015-01-07
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stripping voltammetry of chemically modified carbon paste electrodes has attracted more and more attention and attention due to its advantages of low environmental toxicity, excellent electrochemical performance, and good stability. However, the stripping voltammetry of most chemically modified carbon paste electrodes The detection limits for the detection of lead ions, cadmium ions, and zinc ions are still not low enough to meet the requirements of surface water quality monitoring, hindering the commercial development of carbon paste electrodes for heavy metal ions

Method used

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  • Chemically modified carbon paste electrode as well as preparation method and application thereof
  • Chemically modified carbon paste electrode as well as preparation method and application thereof
  • Chemically modified carbon paste electrode as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0049] A method for preparing a chemically modified carbon paste electrode, comprising the steps of:

[0050] (1) First, take a 100mL mortar, and then add 10.0mg of bismuth oxide powder into the mortar;

[0051] (2) Measure 1 mL of ethanol and add it to the mortar, wherein the 1 mL of ethanol contains 5 mg of dimethylglyoxime, and stir the bismuth oxide powder and dimethylglyoxime in the grinding body to form a paste to obtain a composite modifier;

[0052] (3) After the ethanol is completely volatilized, add 60 mg of graphite powder in the mortar and stir evenly; then add 10 mg of methyl silicone oil and stir to obtain the required carbon paste;

[0053] (4) Take a polytetrafluoroethylene tube with an inner diameter of 2mm, an outer diameter of 5mm, and a length of 40mm as the electrode shell, and polish both ends on sandpaper, clean it by ultrasonic cleaning, dry it, and set it aside;

[0054] (5) The carbon paste that step (3) is made tightly fills in the cleaned polytetra...

Embodiment 2

[0056] A method for preparing a chemically modified carbon paste electrode, comprising the steps of:

[0057] (1) First, take a 100mL mortar, and then add 2mg of bismuth oxide powder into the mortar;

[0058] (2) Measure 2 mL of benzene and add it to the mortar, wherein the 2 mL of benzene contains 2 mg of dithizone, and stir the bismuth oxide powder and dithizone in the grinding body to form a paste to obtain a composite modifier;

[0059] (3) After the benzene is completely volatilized, add 70 mg of mesoporous carbon powder in the mortar and stir evenly; then add 30 mg of paraffin oil and stir to obtain the required carbon paste;

[0060] (4) Take a glass tube with an inner diameter of 2 mm, an outer diameter of 4 mm, and a length of 40 mm as the electrode shell, and smooth both ends on sandpaper, clean it with ultrasonic waves, dry it, and set aside;

[0061] (5) Fill the carbon paste prepared in step (3) tightly into the cleaned glass electrode shell, insert a copper wire...

Embodiment 3

[0063] A method for preparing a chemically modified carbon paste electrode, comprising the steps of:

[0064] (1) First, take a 25mL mortar, and then add 50mg of bismuth hydroxide powder, 30mg of benzoin oxime and 20mg of fullerene into the mortar, and stir well, wherein the bismuth hydroxide powder and benzoin oxime Composition of composite modifiers;

[0065] (2) Add 50mg of mineral oil in the beaker, stir evenly, and make the required carbon paste;

[0066] (3) Take a plastic tube with an inner diameter of 2 mm, an outer diameter of 5 mm, and a length of 40 mm as the electrode shell, and smooth both ends on sandpaper, clean it with ultrasonic waves, dry it, and set aside;

[0067] (4) Fill the carbon paste prepared in step (2) tightly into the cleaned plastic electrode shell, insert a copper wire with a diameter of 2 mm and a length of 50 mm at one end of the electrode nozzle, so that the 20 mm copper wire is exposed to the electrode. The outside of the shell is used as a...

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Abstract

The invention discloses a chemically modified carbon paste electrode which comprises an electrode tube, carbon paste filled in the electrode tube as well as an electrode lead contacted with the carbon paste and lead out from the electrode tube, wherein the carbon paste comprises a conductive carbon material, a bonding agent and a composite modifier; the composite modifier comprises bismuth-contained solid powder and a chelating agent; the bismuth-contained solid powder adopts solid bismuth substances which are insoluble with water; and the chelating agent is a hydrophobic organic reagent and can form a chelate with at least one of lead ions, cadmium ions and zinc ions. The detection limit of the chemically modified carbon paste electrode to lead ions, cadmium ions and zinc ions reaches 1.0*10<-12> M; and compared with the detection limit of a conventional chemically modified carbon paste electrode, the detection limit is reduced by 1-3 orders of magnitude, and the detection performance is remarkably improved on the basis of the conventional chemically modified carbon paste electrode.

Description

technical field [0001] The invention relates to the field of electrochemical analysis, in particular to a chemically modified carbon paste electrode and its preparation method and application. Background technique [0002] In the daily environment, lead ions, cadmium ions and zinc ions are the main heavy metal pollutants, which have obvious biological toxicity and cannot be degraded. As long as there are heavy metal ions such as lead, cadmium and zinc in the environment, they can produce toxic effects, which not only cause environmental pollution, but also harm the normal growth and development of the human body after entering the biological chain, and become important pollutants with potential hazards in the environment. The detection of heavy metal ions such as lead and cadmium is of great significance. [0003] The traditional analytical methods for detecting lead ions, cadmium ions and zinc ions mainly include atomic absorption spectrometry, X-ray fluorescence spectrome...

Claims

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Application Information

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IPC IPC(8): G01N27/333G01N27/26
Inventor 杨海朋杨春常明辉陈青然戈早川
Owner SHENZHEN UNIV
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