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ESPR-based heavy metal analyzer and analysis method thereof

An analysis method and analyzer technology, applied in the field of analytical chemistry, to achieve the effects of less detection interference, less damage, and less background interference

Inactive Publication Date: 2012-08-08
GUANGZHOU INGSENS SENSOR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no instrument that combines electrode arrays and electrochemical / surface plasmon resonance (ESPR) techniques for the determination of heavy metals

Method used

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  • ESPR-based heavy metal analyzer and analysis method thereof
  • ESPR-based heavy metal analyzer and analysis method thereof
  • ESPR-based heavy metal analyzer and analysis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 , figure 2 , image 3 The shown heavy metal analyzer based on ESPR, chemical reaction part, surface plasmon resonance spectrometer and information processing system 1, chemical reaction part includes detection cell 2, counter electrode 3, reference electrode 4, array electrode 5 and electrochemical workstation 6 ;

[0046] The array electrode is located at the bottom of the detection pool, the counter electrode and the reference electrode are inserted into the detection pool, and the counter electrode, reference electrode, and array electrode are respectively connected to the electrochemical workstation; the electrochemical workstation and the surface plasmon resonance spectrometer are respectively connected to the information processing system;

[0047] The array electrode includes 8 active points 7, and the preparation materials of the active points can be one or more of the following: carbon fiber, glassy carbon, carbon nanotube, graphene, fullere...

Embodiment 2

[0058] In order to improve the analytical sensitivity, in the step (2) of the embodiment, the solution to be detected can be added to the detection cell, and at the same time, a process of co-plating bismuth on the array electrode is carried out: the bismuth salt is added to the detection cell; during the detection process, the heavy metal ions are first reduced Form a metal film and then oxidize and dissolve. At the same time, bismuth ions achieve reduction and reoxidize and dissolve with heavy metal ions, and the bismuth ions play a synergistic role. The in-situ bismuth-coated film of the array electrode has the advantages of high sensitivity, wide potential window, and insensitivity to dissolved oxygen. The method of co-coated bismuth film on the modified array electrode is used to measure heavy metal ions. The sensitivity is high, and a variety of heavy metal ions can be detected. Simultaneous rapid determination.

Embodiment 3

[0060] Figure 4 is a graph of the relationship between the sub-meter comparison enrichment time and the SPR signal; Figure 5 is a graph comparing the relationship between the enrichment potential and the SPR signal. Such as Figure 4 It is shown that when the enrichment time increases from 60s to 180s, the SPR signal intensity increases, and when the enrichment time continues to increase, the SPR signal intensity does not change significantly; as Figure 5 Shown Pb 2+ The SPR signal intensity increased with the enrichment potential from -0.9V to -1.3V, and when the potential was more negative, the SPR signal intensity decreased instead.

[0061] Therefore, considering the test time and sensitivity, the enrichment potential is selected as -1.3V, and the enrichment time is selected as 180s. Under this condition, the response current is the largest.

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Abstract

The invention discloses an ESPR-based heavy metal analyzer, which comprises a chemical reaction part, a surface plasma resonance spectrometer and an information processing system, wherein the chemical reaction part includes a detection cell, a counter electrode, a reference electrode, an array electrode and an electrochemical workstation; the array electrode is positioned at the bottom of the detection cell, the counter electrode and the reference electrode are inserted in the detection cell, the counter electrode, the reference electrode and the array electrode are respectively connected to the electrochemical workstation; the electrochemical workstation and the surface plasma resonance spectrometer are respectively connected to the information processing system. The invention further discloses an analysis method of the ESPR-based heavy metal analyzer, which achieves the simultaneous detection of multi-objective heavy metals, enhances the detection sensitivity and spatial resolution, and reduces damages on thin metallic membrane plate (the array electrode and active points thereof).

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to an ESPR-based heavy metal analyzer and an analysis method thereof. Background technique [0002] With the rapid development of science, technology and economy, human beings have caused more and more serious damage to the environment, and more and more types of pollutants have been discharged into the environment. Trace elements in the environment are indispensable to nature, but excessive amounts of Animals, plants, and humans have brought great harm, especially heavy metals with significant biological toxicity such as cadmium, lead, mercury, chromium, and metalloid arsenic. Even a trace amount will cause great harm to human health. On the basis of toxicity and harm to the environment, by analyzing the type, content and form of metal ions in the environment, the environmental effects can be predicted in advance, which can effectively prevent the further deteriorati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41G01N21/55
Inventor 叶建山黄奕莹
Owner GUANGZHOU INGSENS SENSOR TECH
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