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Electrochemical sensor for in-situ analysis and detection of heavy metal copper ions in soil solution

A soil solution and sensor technology, applied in the field of electrochemical analysis and detection, can solve the problems of sensor interference, electrochemical sensor construction process, complex detection mechanism, complex composition, etc., and achieve high sensitivity and accuracy, stability and anti-interference ability Strong, easy-to-build effect

Active Publication Date: 2022-01-28
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the construction process and detection mechanism of the electrochemical sensor are relatively complicated, and it only detects copper ions in water.
Due to the complex composition of the soil solution, in addition to common cations such as lead, calcium, potassium, and nickel, it is also rich in anions and complex organic matter, which will interfere with the sensor

Method used

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  • Electrochemical sensor for in-situ analysis and detection of heavy metal copper ions in soil solution
  • Electrochemical sensor for in-situ analysis and detection of heavy metal copper ions in soil solution
  • Electrochemical sensor for in-situ analysis and detection of heavy metal copper ions in soil solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: Synthesis and characterization of Fe-MIL-101

[0048] Take 0.8105g FeCl 3 ·6H 2 O, 0.4985g terephthalic acid were dissolved in 40mL N,N-dimethylformamide (DMF) respectively, and then the terephthalic acid mixed solution was added dropwise to FeCl 3 ·6H 2 O mixed solution, stirred for 30 minutes until the mixture is uniform, then added 3.6mL of acetic acid, continued to stir until uniform, transferred to a high-temperature and high-pressure reactor, reacted at 110°C for 24h, then centrifuged until the supernatant was clear, stirred in ethanol at 60°C for 3h, and used Centrifuge with absolute ethanol until the supernatant is clear, continue to centrifuge with ultrapure water, and dry in vacuum at 60°C for 8 hours to obtain Fe-MIL-101.

[0049] The obtained Fe-MIL-101 sample was scanned by electron microscope, as figure 1 As shown, under 500nm ( figure 1 b) It can be seen that Fe-MIL-101 is evenly distributed and has a uniform shape. at 200nm ( figure ...

Embodiment 2

[0052] Example 2: Construction of an electrochemical sensor for in-situ analysis and detection of heavy metal copper ions in soil solution

[0053] 1. Construction of the working electrode

[0054] With the glassy carbon electrode as the substrate, after grinding, soaking (the volume ratio of concentrated sulfuric acid and hydrogen peroxide is 3:1), and ultrasonic cleaning, it was inserted into 0.5M H 2 SO 4 In the solution, cyclic voltammetry scanning activation was carried out in the range of -0.4 to 0.8V at 50mV / s to reach a steady state. Place the electrode in 0.1M KCl and 5.0mM Fe(CN) 6 3- In the solution (the solvent is 0.1M PBS buffer solution, pH 7.4), measure the peak potential difference to ensure that it is within 120mV, and then proceed to subsequent electrode construction.

[0055] Add the Fe-MIL-101 material prepared in Example 1 into N,N-dimethylformamide, and sonicate for 1 h to obtain a Fe-MIL-101 material suspension with a concentration of 1.0 mg / mL. 5.0...

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Abstract

The invention discloses an electrochemical sensor for in-situ analysis and detection of heavy metal copper ions in a soil solution. According to the electrochemical sensor, an electrode formed by sequentially modifying Fe-MIL-101, gold nanoparticles and DNAzyme on the surface of a glassy carbon electrode serves as a working electrode. According to the invention, an electrochemical sensor for in-situ analysis and detection of heavy metal copper ions in a soil solution is constructed on the basis of Fe-MIL-101 and DNAzyme. The prepared electrochemical sensor has the advantages of high sensitivity and accuracy, rapidness, convenience, high stability, high anti-interference capability and the like, and has important significance for rapidly and effectively monitoring heavy metal pollution of a soil solution.

Description

technical field [0001] The invention relates to the technical field of electrochemical analysis and detection, in particular to an electrochemical sensor for in-situ analysis and detection of heavy metal copper ions in soil solution. Background technique [0002] Soil heavy metal pollution has become one of the most concerned issues in my country's environmental pollution. The harmful metal detection items stipulated in my country's soil quality standards include: lead, arsenic, cadmium, chromium, copper, zinc, etc. In recent years, with the mining of copper mines, the discharge of three wastes from smelters, the long-term use of copper-containing fungicides and the composting of municipal sludge, the copper content in soil has reached several times or even dozens of times that of the original soil, far exceeding The carrying capacity of the soil environment is harmful to plants, animals and soil microorganisms, and seriously threatens the stability of the ecosystem and huma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/416G01N27/48
CPCG01N27/308G01N27/4166G01N27/48
Inventor 宋佩佩王军孙帅章海波张开渠
Owner SHANDONG AGRICULTURAL UNIVERSITY
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