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Method for detecting metal cation by utilizing VA group or VIA group element compound

A technology of metal cations and compounds, which is used in material analysis by observing the influence of chemical indicators, measurement of color/spectral properties, and analysis by chemical reaction of materials, etc. Due to the complex types of metal cations and low detection sensitivity, the effects of low detection cost, small sampling volume and high detection sensitivity are achieved.

Active Publication Date: 2011-01-19
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

However, when the above methods are actually applied to the actual system to be tested, there are still many problems to be solved. For example, the types of metal cations in the actual system to be tested are complex, and there are problems such as poor selectivity, low detection sensitivity, and poor on-site timeliness for testing samples.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of Detection Solution

[0030] 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

[0031] Example 2 Pb in water samples 2+ detection

[0032] 1)Na 2 SeSO 3 Solution preparation

[0033] 0.0158g of Se powder and 4mL of 0.2mol / L Na 2 SO 3 Solution according to [Se]: [SO 3 2- ]=1:4 molar ratio is added into 95mL deionized water and heated to 80°C for dissolution to obtain [SeSO 3 2- ] at a concentration of 2×10 -3 mol / L Na 2 SeSO 3 solution, and then Na 2 SeSO 3 The solution was placed in a 4°C refrigerator for later use.

[0034] 2) Pb 2+ detection

[0035] First, take 10 mL of the gold nanoparticle detection solution prepared in Example 1, adjust the pH value to 4.0 with 0.1 mol / L hydrochloric acid aqueous solution, and obtain a gold nanoparticle-containing detection solution with a pH value of 4.0.

[0036] Then, prepare two test tubes A and B of the same specification; add the same and equal volume (1 mL) of the above-mentioned detection solution with a pH value of 4.0 to test tube A and test tube B respectively.

[0037] Again, add equal v...

Embodiment 3

[0041] Example 3 Pb in water samples 2+ detection

[0042] 1)K 2 SeSO 3 Solution preparation

[0043] 0.0158g of Se powder and 4mL of 0.2mol / L K 2 SO 3 Solution according to [Se]: [SO 3 2- ]=1:4 molar ratio ratio joins 95mL deionized water, then heats to 80 ℃ of reaction, until solid body all dissolves, makes [SeSO 3 2- ] at a concentration of 2×10 -3 K in mol / L 2 SeSO 3 solution, then the K 2 SeSO 3 The solution was placed in a 4°C refrigerator for later use.

[0044] 2) Pb 2+ detection

[0045] In addition to Na 2 SeSO 3 solution was replaced by the above K 2 SeSO 3 Except solution, all the other operations are with embodiment 2.

[0046] Within 10 minutes, if the color of the solution in test tube B changes relative to the color of the solution in test tube A, that is, turns purple or deepens in color, it is determined that the water sample contains Pb 2+ , and Pb in the water sample 2+ Concentration greater than or equal to 5.0×10 -5 mol / L.

[0047]...

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PUM

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Abstract

The invention discloses a method for detecting a metal cation by utilizing a VA group or VIA group element compound. The VA group or VIA group element compound is utilized and interacts with the detected metal cation to form a core-shell structure on the surface of gold nanoparticles, wherein the gold nanoparticles are taken as the core, and the compound formed by interaction of the VA group or VIA group element compound and the detected metal cation is taken as the shell. The resonance absorption peak of the surface plasma of the gold nanoparticles is changed so that the color of the solution is changed, thus the change of the color of the solution can be directly distinguished by naked eyes or simple instruments and equipment to realize the purpose of quickly detecting the detected metal cation in the solution system. The method has the advantages of simple and convenient operation, low detection cost, high detection sensitivity, small sampling quantity and wide application range.

Description

technical field [0001] The invention relates to the detection field of metal cations, in particular to a method for detecting metal cations by using VA group or VIA group element compounds. Background technique [0002] At present, the rapid development of industrial technology has also brought about the deterioration of the environment. For example, industrial and mining industries, chemicals, batteries, electroplating and other industries discharge wastewater containing a large amount of heavy metal ions into water bodies without treatment or with a little treatment, resulting in an increase in the content of heavy metals in the water, significantly deteriorating water quality, and polluting drinking water. For example, in chromium wastewater, Cr 6+ It has a sensitizing effect at low concentrations, and has irritating and corrosive effects on skin and mucous membranes at high concentrations. At the same time, after chromium enters the animal body, it can affect the oxida...

Claims

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Application Information

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