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Preparation method and application of PVC-carbon paste modified electrode for lead ion detection

A technology for modifying electrodes and lead ions, applied in the field of electrochemical detection, can solve problems such as the existence of mercury and mercury environmental toxicity that cannot be excluded, and achieve the effects of excellent mechanical strength, good reproducibility and low signal-to-noise ratio.

Pending Publication Date: 2020-06-05
广州钰芯传感科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Among them, the stripping method using a mercury film electrode is one of the most effective methods for measuring lead, but due to the environmental toxicity of mercury, the current technology has developed a variety of mercury substitutes, such as gold film electrodes, silver film electrodes, and platinum electrodes. Membrane electrodes and carbon film modified electrodes, etc., but the presence of mercury cannot be ruled out

Method used

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  • Preparation method and application of PVC-carbon paste modified electrode for lead ion detection
  • Preparation method and application of PVC-carbon paste modified electrode for lead ion detection
  • Preparation method and application of PVC-carbon paste modified electrode for lead ion detection

Examples

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Effect test

Embodiment 1

[0032] Preparation of PVC-carbon paste modified electrode:

[0033] (1) Weigh 0.2000g of PVC powder and dissolve it in an appropriate amount of tetrahydrofuran, then add 3.0000g of graphite powder and mix evenly. , and then polished smooth on weighing paper, rinsed the surface of the electrode with distilled water, and dried it at room temperature for later use.

[0034] (2) Put the prepared PVC-carbon paste modified electrode into a potassium nitrate solution with a pH of 11.0 to react for 10 minutes, carry out enrichment treatment, take it out and wash it, place it in a 0.15M nitric acid solution, and electrolyze it at a reduction potential of -1.0V For 60 seconds, the lead ion concentration was tested by differential pulse anodic stripping voltammetry.

Embodiment 2

[0036] Preparation of PVC-carbon paste modified electrode:

[0037] (1) Weigh 0.2000g of PVC powder and dissolve it in an appropriate amount of tetrahydrofuran, then add 2.0000g of graphite powder and mix evenly. , and then polished smooth on weighing paper, rinsed the surface of the electrode with distilled water, and dried it at room temperature for later use.

[0038](2) Put the prepared PVC-carbon paste modified electrode into a potassium nitrate solution with a pH of 11.0 to react for 10 minutes, carry out enrichment treatment, take it out and wash it, place it in a 0.15M nitric acid solution, and electrolyze it at a reduction potential of -1.0V For 60 seconds, the lead ion concentration was tested by differential pulse anodic stripping voltammetry.

Embodiment 3

[0040] Preparation of PVC-carbon paste modified electrode:

[0041] (1) Weigh 0.2000g of PVC powder and dissolve it in an appropriate amount of tetrahydrofuran, then add 2.4000g of graphite powder and mix evenly. , and then polished smooth on weighing paper, rinsed the surface of the electrode with distilled water, and dried it at room temperature for later use.

[0042] (2) Put the prepared PVC-carbon paste modified electrode into a potassium nitrate solution with a pH of 11.0 to react for 10 minutes, carry out enrichment treatment, take it out and wash it, place it in a 0.15M nitric acid solution, and electrolyze it at a reduction potential of -1.0V For 60 seconds, the lead ion concentration was tested by differential pulse anodic stripping voltammetry.

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Abstract

The invention provides a preparation method and application of a PVC-carbon paste modified electrode for lead ion detection. The electrode can directly adsorb Pb <2+> in tap water, and PVC in the electrode can be used as a binding material and an enriching agent for Pb <2+>. The electrode has the advantages of wide linear range, low detection limit, good reproducibility, strong anti-interference performance and the like, and can be directly used for detecting Pb <2+>. The linear range of the electrode for measuring the lead ions is 2.0 * 10 <-5>-1.0 * 10 <-7> mol / L, and the detection limit is5.0 * 10 <-8> mol / L.

Description

technical field [0001] The invention belongs to the field of electrochemical detection, in particular to a preparation method and application of a PVC-carbon paste modified electrode for lead ion detection. Background technique [0002] Lead is a harmful heavy metal that exists in nature. It is harmful to the nervous system, digestive system, male reproductive system and hematopoietic function of the human body, especially to children whose brains are in the developing stage. For this reason, the World Health Organization stipulates that the lead content in water should not exceed 10μg / L. [0003] The determination methods of lead content include atomic absorption method, atomic emission spectrometry, plasma mass spectrometry and electrochemical methods, etc. Among them, plasma mass spectrometry is the most sensitive and can detect lead at ppt level, and the detection limit of flame atomic absorption method can reach ppb level. The sensitivity of electrochemical stripping ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 奚亚男胡淑锦
Owner 广州钰芯传感科技有限公司
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