Modified silk-screen printing electrode and application thereof

A screen-printed electrode and modified technology, which is applied in the field of electrochemical analysis and detection, can solve the problems of limited wide application, unsuitable basic use, bulky instrument, etc., and achieves the effect of improving arsenic detection signal, easy operation and high-sensitivity detection.

Active Publication Date: 2021-04-30
WUHAN ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, the commonly used arsenic analysis techniques mainly include atomic absorption spectroscopy (AAS), atomic fluorescence spectroscopy (AFS), inductively coupled plasma atomic emission spectrometry (ICP- AES) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS), these methods have reliable detection results, high sensitivity and high sensitivity, but they also have disadvantages such as bulky instruments, high prices, need for special personnel to operate and maintain, and are not suitable for grassroots use. Wide application in practical analysis

Method used

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  • Modified silk-screen printing electrode and application thereof
  • Modified silk-screen printing electrode and application thereof
  • Modified silk-screen printing electrode and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Printing of screen-printed electrodes

[0039] Mix commercial carbon slurry, carbon nanotubes and oxalic acid, stir at a constant speed for 24h, and rotate at a speed of 120r / min to obtain a modified carbon slurry; wherein, the inner diameter of the carbon nanotubes: 5-15nm, outer diameter: 30-80nm and length<10 μm, Its mass fraction is 0.4%, oxalic acid accounts for 1.0% (mass fraction), and the rest is commercial carbon pulp.

[0040] The mesh of the screen printing screen used is 220 mesh, the tension is 25N, the hardness of the scraper is 80°, the angle is 70°, the speed is 1cm / s, and the height between the screen and the printing plate is 3mm.

[0041] First, the silver-silver chloride layer is printed on the PET substrate. The silver-silver chloride layer is printed in three non-contact rectangular printing areas, the left end of which is flush, and the middle left end can be divided into two parallel groups. The rectangular printing area is connected in the ...

Embodiment 2

[0055] The difference from Example 1 is that polylactic acid with a mass fraction of 0.4% is added to the modified carbon slurry, and a series of test solutions with known arsenic concentrations are: 2.0, 4.0, 6.0, 8.0, 10, 12, 14 , 16ppb, and other preparation and detection processes are consistent with Example 1. The stripping voltammograms (such as Figure 4 ), record the stripping current intensity, specifically as shown in Table 2:

[0056] Table 2

[0057]

[0058]

[0059] The stripping current intensities of the same arsenic concentration in Example 1 and Example 2 are compared, as shown in Table 3:

[0060] table 3

[0061]

[0062] It can be seen that after adding 0.4% polylactic acid, the detection signal of arsenic was increased by about 50%.

[0063] The stripping voltammogram under 4ppb concentration in embodiment 1 is compared with the stripping voltammogram under 4ppb concentration in embodiment 2 ( Figure 5 ), it can be seen that after the addit...

Embodiment 3

[0065] The difference from Example 1 is that the amount of oxalic acid added to the carbon slurry in the electrode preparation process is different, and the stripping current of the 4ppb trivalent arsenic standard solution was measured according to the experimental steps and detection parameters of Example 1.

[0066] The comparison of the stripping current intensity of arsenic detection by electrodes printed with different oxalic acid additions is shown in Table 4. The comparison shows that when the oxalic acid addition in the carbon slurry is 1.0-1.6%, the detection signal of the printed electrode is better, and the electrode detection signal is better when the oxalic acid content is increased. Ability enhancements don't help much.

[0067] Table 4

[0068]

[0069]

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Abstract

The invention discloses a modified silk-screen printing electrode and an application thereof. Printing raw materials of an electrode carbon layer comprise carbon paste, a carbon-based nano material and an oxalic acid, the mass fraction of the carbon-based nano material is 0.3-0.5%, the mass fraction of the oxalic acid is 1-1.6%, and the balance is the carbon paste; and gold nanoparticles are deposited on the surface of a working electrode of the electrode. When the modified screen-printed electrode is used for detecting a content of trivalent arsenic ions, an electrochemical signal can be effectively improved, and the enrichment capacity of the trivalent arsenic ions on the surface of the electrode can be increased; and during use, the detection cost is low, the sensitivity is high, dependence on large instruments and professional operators is avoided, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of electrochemical analysis and detection, in particular to a modified screen printing electrode and its application in the detection of trivalent arsenic ions. Background technique [0002] Arsenic exists widely in nature. In addition to natural causes such as rock weathering and volcanic eruptions, human activities such as the use of arsenic-containing pesticides, coal combustion, and industrial waste discharges have accelerated the increase in the arsenic content in the environment. In recent years, drinking water and food safety problems caused by arsenic have occurred frequently, and the problem of arsenic pollution has attracted more attention. Excessive or long-term exposure to arsenic can cause serious harm to the human respiratory system, circulatory system, and nervous system, leading to skin, lung, liver, bladder, and cardiovascular diseases, and even cancer. Arsenic exists in the form of inorgan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 战艺芳姚琪王嫦嫦管金艳胡金伟李正郑思洁李婷婷王利华白向茹
Owner WUHAN ACADEMY OF AGRI SCI
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