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Mercury ion test strip and preparation method and testing method thereof

A technology for detecting test strips and mercury ions, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of increasing the process of nucleic acid and gold nanocomposite, the inability to quickly and accurately detect mercury ions, and the inability to realize large-scale applications. Achieve the effects of fast measurement speed, low cost and short production cycle

Inactive Publication Date: 2017-05-31
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few test papers for mercury ion detection in the prior art, and the preparation process of the existing test papers is complicated, the cost is high, and the detection sensitivity is low, so the purpose of quickly and accurately detecting mercury ions cannot be achieved.
In addition, in the existing chemical reagent detection methods, there has been a method of using DNA or nucleic acid to combine with gold nanometers to improve catalytic activity, but this method increases the process of nucleic acid and gold nanocomposites, and the preparation cost is too high. Complex, unable to realize large-scale application

Method used

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  • Mercury ion test strip and preparation method and testing method thereof
  • Mercury ion test strip and preparation method and testing method thereof
  • Mercury ion test strip and preparation method and testing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of test paper by using gold nanoparticles: soak ordinary filter paper in gold nanoparticle solution (0.4mmol / L, particle size about 4nm) for 30min, take it out and dry it at 40°C; cut the ordinary filter paper with gold nanoparticles into A strip with a size of 0.8*0.2 cm was used as the indicator area of ​​the test paper, and was pasted on a polyvinyl chloride resin substrate with a slightly larger size to prepare a mercury ion detection test paper A.

Embodiment 2

[0057] Under normal temperature conditions, 2.5mmol / L, 20mL aqueous solution of chloroauric acid was dissolved in 100mL ultrapure water, after stirring evenly, 50mmol / L, 5mL sodium borohydride aqueous solution was added dropwise, and the solution changed from light yellow to Deep red, continue to stir for a while, store at 4°C, and set aside. In this embodiment, the molar ratio of the three substances is chloroauric acid: sodium tripolyphosphate: sodium borohydride = 1:0:5, and the particle size of the prepared gold nanoparticles is as follows image 3 (a) shows about 12nm, and the concentration of the gold nanoparticle solution is 0.4mmol / L; according to the method in Example 1, the test paper D is prepared.

Embodiment 3

[0059] Under normal temperature conditions, dissolve 2.5mmol / L, 20mL chloroauric acid aqueous solution in 0.25mmol / L, 100mL sodium tripolyphosphate aqueous solution, after stirring evenly, add 50mmol / L, 5mL sodium borohydride aqueous solution dropwise , the solution changed from light yellow to deep red, continued to stir for a period of time, and stored at 4°C for later use. In this embodiment, the molar ratio of the three substances is chloroauric acid: sodium tripolyphosphate: sodium borohydride=1:0.5:5, and the particle diameter of the prepared gold nanoparticles is as follows image 3 (b) shows about 4nm, and the concentration of the gold nanoparticle solution is 0.4mmol / L; according to the method in Example 1, the test paper E is prepared.

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Abstract

The invention discloses a mercury ion test strip and a preparation method and a testing method thereof and belongs to the field of heavy metal ion testing. The preparation method for the mercury ion test strip has the steps that the test strip comprises a hydrophilic membrane and a hydrophobic substrate; the hydrophilic membrane is dipped in a gold nanoparticle solution for a period of time, so that gold nanoparticles are attached to the hydrophilic membrane; and the hydrophilic membrane is taken out and dried; and the obtained hydrophilic membrane, attached with the gold nanoparticles, as an indicating area of the test strip, is pasted on the hydrophobic substrate so as to obtain the mercury ion test strip. The mercury ion test strip disclosed by the invention has the advantages of simple preparation method, short production period, low cost and convenient carrying and can realize field detection; and the method for detecting by using the mercury ion test strip is simple and the sensitivity of the method is high.

Description

technical field [0001] The invention belongs to the field of detection of heavy metal ions, and in particular relates to a mercury ion detection test paper, a preparation method and a detection method thereof. Background technique [0002] With the rapid development of industry and agriculture, heavy metal pollution has seriously affected human health and restricted the sustainable development of the economy. Among heavy metal ions, mercury is highly toxic but ubiquitous in nature. Hg 2+ It is one of the main forms of mercury. When it enters the water body, it can be enriched through the food chain and finally absorbed by the human body, causing great harm to human health. As a highly toxic heavy metal element, mercury has become a major global environmental problem, and has also attracted great attention from the Chinese government. Therefore, Hg 2+ The analysis and detection is particularly important. [0003] Currently, mercury ion detection methods mainly include fl...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78G01N2021/7759
Inventor 隋凝刘风娅王丽娜白强刘漫红于伟泳
Owner QINGDAO UNIV OF SCI & TECH
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