Preparation method of nano gold colorimetric sensor and application thereof in detection of divalent mercury ions

A colorimetric sensor and nano-gold technology, which is applied in the fields of environmental science, laboratory chemistry and analytical chemistry, can solve the problems of strict sample storage conditions, high cost of analysis methods, and strong operation professionalism, achieving strong selectivity, high sensitivity, good repeatability

Inactive Publication Date: 2017-09-12
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a solution for the problems of strict sample storage conditions, high cost of analysis methods, long analysis time, and strong professionalism

Method used

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  • Preparation method of nano gold colorimetric sensor and application thereof in detection of divalent mercury ions
  • Preparation method of nano gold colorimetric sensor and application thereof in detection of divalent mercury ions
  • Preparation method of nano gold colorimetric sensor and application thereof in detection of divalent mercury ions

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Add 100mL of 0.24mM chloroauric acid tetrahydrate to a 250mL Erlenmeyer flask (soak overnight in freshly made aqua regia, wash with ultrapure water, dry, and set aside), heat to boiling, add 4mL of 0.034M lysine sodium salt solution under magnetic stirring , heated to reflux for 5h, the solution changed from light yellow to wine red, stop heating, continue to stir to room temperature, and store at room temperature away from light.

[0072] Measure the ultraviolet-visible absorption spectrum of the lysine sodium salt modified nano-gold solution prepared in this embodiment, such as figure 1 shown. From figure 1 It can be seen that a characteristic absorption peak appears at 521 nm.

Embodiment 2

[0074] The lysine sodium salt modified nano-gold colorimetric sensor prepared above was mixed with an equal volume of 1×10 -6 The high mercury chloride aqueous solution of M is mixed, and the ultraviolet-visible spectrometer (Uv-Vis) is used to detect the change of the corresponding ultraviolet-visible spectrum within 1 to 10 minutes. The experimental results are as follows: figure 2 shown. From figure 2 It can be seen that the UV-visible absorption peak of the nano-gold solution began to decrease significantly at 1 min.

[0075] Observe the ratio of the absorption value corresponding to the characteristic absorption wavelength (A 650 / A 521 ) changes with time, such as image 3 shown. From image 3 It can be seen that the value is basically stable after 3 minutes, so the nano-gold probe modified by lysine sodium salt can quickly detect Hg 2+ .

Embodiment 3

[0077] The nano-gold colorimetric sensor modified by the lysine sodium salt prepared in Example 1 is used for 1×10 -6 Hg 2+ For detection, take 1.5mL concentration as 1×10 -6 M of high mercury chloride aqueous solution, and then sequentially measure 1.5mL containing other metal ions (FeCl 3 , FeCl 2 ,KCl,CuCl 2 ,MnCl 2 ,CdCl 2 ,CoCl 2 ,NiCl 2 ,Pb(NO 3 ) 2 ,ZnCl 2 ,MgCl 2 ,CaCl 2 ,AlCl 3 ,CrCl 3 ,Cr 2 o 7 2- ) concentration is 2×10 -5 M aqueous solution, the above-mentioned gold nanoparticles modified by lysine sodium salt were mixed with the solution containing the above-mentioned metal ions, and 100 μL of 0.2M disodium hydrogen phosphate-sodium dihydrogen phosphate buffer solution (pH=7) was added, and the concentration was observed. The color changes, the experimental results are as follows Figure 4 shown. It was found that only Hg-containing 2+ The nano-gold solution turns from red to blue.

[0078] Simultaneously, measure the ultraviolet-visible abso...

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Abstract

The invention discloses a preparation method of a nano gold colorimetric sensor and application thereof in colorimetric detection of divalent mercury ions (Hg2+), and is intended to solve the problem that existing ICP (inductively coupled plasma), AAS (atomic absorption spectrometry) and AFS (atomic fluorescence spectrometry) methods and other mercury ion detection methods generally have the defects such as strict sample storage conditions, high analysis process cost, long analytical time and high operational professionality. The stable and water-soluble nano gold colorimetric sensor modified via sodium lysinate is prepared by using gold salt and gold nano particles as sources, using sodium lysinate as a reducing agent and ligand and reacting under gold salt solution boiling. The nano gold colorimetric sensor has the advantages of good portability, high sensitivity, high selectivity, good stability and the like, allows Hg2+ to be detected fast, has the advantages of high detection speed, high sensitivity and the like, and has a promising application prospect and high marketing value.

Description

technical field [0001] The invention relates to the fields of environmental science, laboratory chemistry and analytical chemistry, specifically a method for preparing a nano-gold colorimetric sensor and its application in the detection of divalent mercury ions, and further a method for preparing a nano-gold colorimetric sensor and The application of its colorimetric detection of divalent mercury ions. The invention provides a sensor for fast, sensitive and visual detection and analysis of divalent mercury ions and its application, which has good effect. Background technique [0002] Mercury is an environmental poison that seriously endangers human health. Its ions include monovalent mercury ions and divalent mercury ions. It exists in the form of metallic mercury, inorganic mercury and organic mercury in nature. Metallic mercury often pollutes the atmosphere in the form of vapor and can enter the human body through the respiratory tract. At the same time, metal mercury is...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31B82Y30/00
CPCG01N21/78B82Y30/00G01N21/31G01N2021/3188G01N2021/3196
Inventor 赵鹏翔黄德顺魏建宇岳国宗朱婧王玥杨晓娇
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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