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Method for detecting copper ions

A technology of copper ions and gold nanoparticles, which is applied in the field of analysis and detection, can solve the problems of limitation and detection limit of only 50mM, and achieve the effects of inhibiting dissolution, strong anti-interference, and convenient detection methods

Inactive Publication Date: 2011-09-07
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method has good selectivity for copper ions, the detection limit is only 50 mM
In addition, because some components in the actual sample matrix, such as high salt, acid and ligands, can also lead to the aggregation of gold nanoparticles, so it is subject to certain limitations.

Method used

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  • Method for detecting copper ions
  • Method for detecting copper ions
  • Method for detecting copper ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Gold nanoparticles sol 30 mg / L

[0027] NH 3 / NH 4 Cl 10 mM

[0028] KSCN 10 mM

[0029] Hydrogen peroxide 20 mM

[0030] Solution preparation method: after mixing complexing agent A KSCN, complexing agent B ammoniacal buffer solution, gold nanoparticle sol and hydrogen peroxide, a test solution is prepared. Add different standard concentrations of copper ions, heat in a water bath at 60°C for 8 minutes, and compare with that without the test substance.

[0031] Change the concentration of different copper ions (0~5 mM), when no copper ions are added, the solution is colorless, and when the concentration of copper ions is 5 mM, the solution is dark red, and different colors can be obtained under the standard concentration. Deep nano gold solution, such as figure 2 shown. In order to further improve its color resolution, we added 10 mg / L copper phthalocyanine dye to the solution to display different colors. Such as image 3 As shown, when no copper ions are add...

Embodiment 2

[0033] Gold nanoparticles sol 30 mg / L

[0034] NH 3 / NH 4 Cl 10 mM

[0035] KSCN 10 mM

[0036] Hydrogen peroxide 20 mM

[0037] Solution preparation method: after mixing complexing agent A KSCN, complexing agent B ammoniacal buffer solution, gold nanoparticle sol and hydrogen peroxide, a test solution is prepared. Add different interfering ions, heat in a water bath at 60°C for 8 minutes, and compare with the addition of copper ions.

[0038] The effect of different metal ions (at a concentration of 5uM), such as Figure 4 As shown, only mercury ions interfered.

Embodiment 3

[0040] Gold nanoparticles sol 25 mg / L

[0041] NH 3 / NH 4 Cl 10 mM

[0042] KSCN 10 mM

[0043] KI 10mM

[0044] Hydrogen peroxide 20 mM

[0045] Solution preparation method: after mixing complexing agent A KSCN, complexing agent B ammoniacal buffer, anti-mercury interference agent potassium iodide, gold nanoparticle sol and hydrogen peroxide, a test solution is prepared. Add mercury ions, heat in a water bath at 60°C for 8 minutes, and compare with the addition of copper ions.

[0046] The effect of mercury metal ions after adding KI (concentration is 5mM), such as Figure 5 As shown, the interference of mercury ions can be eliminated.

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Abstract

The invention provides a method for detecting copper ions. In the method provided by the invention, a strong oxidizer and a complexing agent are added to gold nano particle sol, and the color of the solution is changed when the copper ions exist in the solution, thereby detecting the copper ions; the solution comprises the complexing agent, the strong oxidizer and a solvent, wherein the complexing agent comprises a complexing agent A and a complexing agent B; the complexing agent A is a compound containing sulfur, and the concentration of the complexing agent A is 5-20mM; the complexing agent B is an ammonia compound, and the concentration of the complexing agent B is 5-40mM; the strong oxidizer is hydrogen peroxide, and the concentration of the strong oxidizer is 5-50mM; and the solvent is water. Compared with the traditional nano gold aggregated coloration method, the method provided by the invention is stronger in interference resistance on the high salt, acid and ligand in an actual sample. In the method provided by the invention, the concentration of the copper ions in visual colorimetric measurement can reach 0.05mM, and the method is good in selectivity, does not need any instrument and equipment and can be conveniently and rapidly applied to the scene detection of the copper ions.

Description

technical field [0001] The invention relates to a method for detecting copper ions, belonging to the field of analysis and detection. Background technique [0002] Although copper ions are essential elements for animals and plants, similarly, excessively high concentrations of copper ions can cause the death of bacteria and algae in the water body, as well as damage to the human liver and kidneys and disturbance of gastrointestinal function. Therefore, the detection of copper ions is of great significance in terms of environmental protection and human health. Environmental Quality Standards for Surface Water (GB3838-2002), the content of copper ions≦0.01 (Class I) ~ 1.0 (Class V) mg / L (0.15 ~ 15 mM) (Note: Class I refers to Class I protected areas, Class V refers to Category V protected area). [0003] Compared with the traditional current detection methods of copper ions, such as atomic absorption method, ion chromatography, electrochemical detection and other methods, th...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 孙建军方一民陈金水陈国南
Owner FUZHOU UNIV
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