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Detection method of metal ions

A technology of metal ions and detection methods, applied in the measurement of color/spectral characteristics, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc., can solve other ion interference, pollution source expansion, etc. The problem of complex sample preparation steps, etc., achieves the effect of simple and convenient operation, high detection sensitivity, and low detection cost.

Active Publication Date: 2010-11-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the policy of focusing on prevention and combining prevention and control is mainly adopted for heavy metal pollution. Although there are special equipment for detecting metal ions such as atomic absorption (AAS), atomic fluorescence absorption (AFS) and inductively coupled plasma-mass spectrometer, etc., these The instrument is expensive, and there are often defects such as complicated sample preparation steps, poor water solubility of the sample, and serious interference from other ions when it is used for the detection of metal ions
In view of the current national economic situation, many units or individuals with insufficient conditions or immature technology cannot use the above-mentioned advanced equipment for routine detection of heavy metals, resulting in the expansion of pollution sources; moreover, the method of using instrument detection cannot realize real-time and on-site detection of water quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of Detection Solution

[0034] Get 5mmol / L tetrachloroalloy acid aqueous solution 5mL and join in 71mL deionized water, add 0.5mmol / L CTAB aqueous solution 24mL under stirring condition, then slowly add 1.6mL 1mmol / L sodium borohydride aqueous solution wherein, Stir continuously for 30 minutes at room temperature to obtain a detection solution containing CTAB-modified gold nanoparticles.

Embodiment 2

[0035] Example 2 Preparation of Detection Solution

[0036] Add 100 μl of thioglycolic acid to 100 ml of the detection solution containing CTAB-modified gold nanoparticles prepared in Example 1, stir and mix evenly, and obtain the detection solution containing CTAB and thioglycolic acid-modified gold nanoparticles.

Embodiment 3

[0037] Example 3 Hg in water sample 2+ detection

[0038] First, take 10 ml of the detection solution containing CTAB-modified gold nanoparticles prepared in Example 1, and adjust the pH value of the detection solution to 3.57 with 0.1 mol / L hydrochloric acid aqueous solution to obtain a detection solution with a pH value of 3.57.

[0039] Then, prepare two test tubes A and B of the same specification; add the same and equal volume of the detection solution with a pH value of 3.57 to test tube A and test tube B respectively.

[0040] Next, add equal volumes of 1ml of ultrapure water and 1ml of the water sample to be tested to test tube A and test tube B respectively;

[0041] Again, add 30 microliters of 20 mmol / L thioacetamide aqueous solution to test tube A and test tube B respectively.

[0042] Finally, place test tube A and test tube B at room temperature, and observe the changes in the solutions in test tube A and test tube B.

[0043] Within 5 minutes, if the color of...

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Abstract

The invention discloses a detection method of metal ions. In the method, based on a gold nanoparticles-sulfide system, by virtue of the interaction among the gold nanoparticles, a hydrolysate of a sulfide and the detected metal ions or the interaction among the gold nanoparticles, a sulfhydryl compound and the detected metal ions, resonance absorption of plasmas on the surface of the gold nanoparticles changes so that the color and the ultraviolet visible absorption strength of the gold nanoparticles changes. By adopting the method, the detected metal ions in the solution system can be rapidly detected by directly distinguishing change of solution color through eyes or a simple apparatus. The detection method has the advantages of simple and convenient operation, low detection cost, high detection sensitivity, small sampling quantity and wide application scope.

Description

technical field [0001] The invention relates to the field of detection of metal ions, in particular to a detection method of metal ions. Background technique [0002] With the development of science and technology, human beings' demand for resources is also increasing. In order to speed up the development of science and technology, human beings excessively ask for resources from nature, which leads to a major problem in today's society-environmental pollution. At present, environmental pollution has become a problem that cannot be ignored. Industrial "three wastes" (waste water, waste gas, and waste residue) have caused great damage to the environment, especially the discharge of industrial waste water to the pollution of water resources is particularly prominent. For example, industrial wastewater from industries such as mining, chemical industry, batteries, and electroplating contains a large amount of heavy metal ions. Some companies discharge these wastewater into water...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/33
Inventor 张付强吴爱国曾乐勇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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