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Method of detecting silver ions and serine based on mercaptosuccinic acid-modified CdTe quantum dot paper core sheet

A technology of mercaptosuccinic acid and quantum dots, which is applied in the field of paper chip sensing, can solve the problems of cumbersome operation procedures, complicated and precise instruments, insufficient to meet the fast field detection of silver ions, etc., and achieves high sensitivity and selectivity. The effect of fast and fast on-site inspection

Inactive Publication Date: 2019-05-31
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional detection methods include atomic absorption / emission spectroscopy, plasma mass spectrometry, and polarography, etc., all of which involve complex and precise instruments, cumbersome operating procedures, etc., so that their application is limited to a certain extent, and they are not enough to meet the needs of rapid field detection of silver ions. Therefore, it is necessary to establish a silver ion detection method that is simple, economical, fast, and can be detected on the spot

Method used

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  • Method of detecting silver ions and serine based on mercaptosuccinic acid-modified CdTe quantum dot paper core sheet
  • Method of detecting silver ions and serine based on mercaptosuccinic acid-modified CdTe quantum dot paper core sheet
  • Method of detecting silver ions and serine based on mercaptosuccinic acid-modified CdTe quantum dot paper core sheet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation method of the paper chip of CdTe quantum dots modified with mercaptosuccinic acid includes the steps:

[0046] (1) Preparation of CdTe quantum dots (TMA-capped CdTe) modified with mercaptosuccinic acid

[0047] Dissolve cadmium dichloride (0.1142g, 12.5mM) and mercaptosuccinic acid (0.0901g, 15mM) in 40mL ultrapure water, adjust the pH of the solution to 11, and then stir in an ice bath with nitrogen for 20 minutes, and add tellurium Sodium (0.0216g, 2.5mM), stir for 15 minutes, then add sodium borohydride (0.0113g, 7.5mM), stir for 15 minutes to obtain a mixed solution, and finally put the mixed solution into the reaction kettle, in an oven at 200℃ React for 50 minutes and cool to room temperature to obtain 7.10×10 -5 CdTe quantum dots modified with mol / L mercaptosuccinic acid. Use a transmission electron microscope to observe, such as figure 2 As shown, the transmission electron microscope characterizes the particle size of 3~5nm.

[0048] (2) Preparation ...

Embodiment 2

[0051] The method for detecting silver ions based on the CdTe quantum dot paper chip modified by mercaptosuccinic acid includes the steps:

[0052] (1) Preparation of CdTe quantum dots (TMA-capped CdTe) modified with mercaptosuccinic acid

[0053] Dissolve cadmium dichloride (0.1142g, 12.5mM) and mercaptosuccinic acid (0.0901g, 15mM) in 40mL ultrapure water, adjust the pH of the solution to 11, and then stir in an ice bath with nitrogen for 20 minutes, and add tellurium Sodium (0.0216g, 2.5mM), stir for 15 minutes, then add sodium borohydride (0.0113g, 7.5mM), stir for 15 minutes to obtain a mixed solution, and finally put the mixed solution into the reaction kettle, in an oven at 200℃ React for 50 minutes and cool to room temperature to obtain 7.10×10 -5 CdTe quantum dots modified with mol / L mercaptosuccinic acid. Use a transmission electron microscope to observe, such as figure 2 As shown, the transmission electron microscope characterizes the particle size of 3~5nm.

[0054] (2...

Embodiment 3

[0065] The method for detecting serine based on the CdTe quantum dot paper chip modified by mercaptosuccinic acid includes the steps:

[0066] (1) Preparation of CdTe quantum dots (TMA-capped CdTe) modified with mercaptosuccinic acid

[0067] Dissolve cadmium dichloride (0.1142g, 12.5mM) and mercaptosuccinic acid (0.0901g, 15mM) in 40mL ultrapure water, adjust the pH of the solution to 11, and then stir in an ice bath with nitrogen for 20 minutes, and add tellurium Sodium (0.0216g, 2.5mM), stir for 15 minutes, then add sodium borohydride (0.0113g, 7.5mM), stir for 15 minutes to obtain a mixed solution, and finally put the mixed solution into the reaction kettle, in an oven at 200℃ React for 50 minutes and cool to room temperature to obtain 7.10×10 -5 CdTe quantum dots modified with mol / L mercaptosuccinic acid. Based on transmission electron microscope observation, such as figure 2 As shown, the transmission electron microscope characterizes the particle size of 3~5nm.

[0068] (2)...

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Abstract

The invention relates to the field of paper core sensing, in particular to a method of detecting silver ions and serine based on a mercaptosuccinic acid-modified CdTe quantum dot paper core sheet. Themethod herein comprises the steps of (1) preparing mercaptosuccinic acid-modified CdTe quantum dots; (2) preparing the mercaptosuccinic acid-modified CdTe quantum dot paper core sheet; (3) making a silver ion standard colorimetric card; (4) detecting silver ions of the sample. Compared with existing silver ion and serine detection methods, the method herein has the advantages of good preparationsimplicity, high field detection speed, low cost, high response speed, good sensitivity and high selectivity; the paper core sheet is specifically reactive to silver ions and serine and is suitable for detecting silver ions or serine in complex matrix water samples.

Description

Technical field [0001] The invention relates to the field of paper chip sensing, in particular to a paper chip based on mercaptosuccinic acid modified CdTe quantum dots for detecting silver ions and serine. Background technique [0002] As an excellent fluorescent nanomaterial, water-soluble quantum dots have the advantages of good light stability, long fluorescence lifetime, good biocompatibility, large Stokes shift, etc., making it an ideal fluorescent probe. Based on its fluorescent properties, it is used as an efficient fluorescent probe for environmental monitoring, medical diagnosis, clinical medicine, etc. With the development of my country's industrialization, the pollution of silver ions in drinking water and food has become increasingly prominent, posing a certain threat to human health. In addition, the U.S. Environmental Protection Agency (EPA) pointed out that the poisoning level of silver ions in drinking water is 460nM, and the biological exposure index of silver ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02B82Y20/00B82Y30/00B82Y40/00G01N21/78
Inventor 付海燕胡鸥佘远斌
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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