Method for rapid in-situ detection of object surface pollutants

An object surface and in-situ detection technology, which is applied in the detection field, can solve the problems of inability to realize rapid in-situ detection of pollutants on the surface of objects, failure to excite pollutant Raman signals, difficulty for laser to penetrate the support layer, etc., to achieve rapid on-site detection. Effects of in-situ detection, enhanced adsorption and enrichment capacity, and convenience for on-site sampling

Inactive Publication Date: 2016-07-20
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

These hard substrates are not flexible, and it is difficult to directly attach them to the surface of irregular objects for in-situ detection
Although a small number of SERS substrates use support layers of flexible materials, such as cellulose paper, opaque polymers and carbon nanotubes, etc., because these flexible support layers are opaque, it is difficult for laser light to penetrate the support layer and cannot excite pollutants. Raman signal
Therefore, rapid in-situ detection of pollutants on the surface of objects cannot be achieved

Method used

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  • Method for rapid in-situ detection of object surface pollutants
  • Method for rapid in-situ detection of object surface pollutants
  • Method for rapid in-situ detection of object surface pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) First take 15ml of freshly prepared nano-silver-coated gold particle solution in a 25mL beaker and put it into the rotor;

[0032] 2) Then add 3ml of toluene and cyclohexanone mixed solution containing 5% polystyrene to the nano silver-coated gold particle solution to form an oil-water interface;

[0033] 3) Gently stir the nano-silver-coated gold particle solution through the rotor, so that the nano-silver-coated gold particles float to the oil-water interface, and self-assemble into an assembly;

[0034] 4) After the organic solvent in the upper layer is volatilized, the polystyrene film containing the nano-assembly is taken out, and finally a flexible, semi-transparent surface-enhanced Raman substrate is obtained.

Embodiment 2

[0036] 1) First take 15ml of aqueous solution in a 25mL beaker;

[0037] 2) Then add 3ml of cyclohexane solution containing 5% polymethyl methacrylate to the aqueous solution to form an oil-water interface;

[0038] 3) Then slowly inject the concentrated nano-gold ethanol solution into the oil-water interface to form a nano-gold assembly;

[0039] 4) After the upper layer of cyclohexane volatilizes, the polymethyl methacrylate film containing the nano-gold assembly is taken out, and finally a flexible, semi-transparent surface-enhanced Raman substrate is obtained.

Embodiment 3

[0041] 1) First, soak the flexible, semi-transparent surface-enhanced Raman substrate prepared in Example 1 in a 1 mM thiolated β-cyclodextrin solution for 5 hours;

[0042] 2) Then wash the substrate with deionized water, stick it on the surface of the apple after cleaning, and rub it back and forth to increase the enrichment ability of the substrate to pollutants;

[0043] 3) Then use a portable Raman spectrometer to perform a Raman spectrum scan on the apple with a surface-enhanced Raman substrate;

[0044] 4) Finally, through the detected Raman signal, it is judged whether there are pesticides and other pollutants on the apple surface.

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Abstract

A method for rapid in-situ detection of object surface pollutants is characterized in that a flexible and semi-transparent surface enhanced Raman substrate is used and is composed of a Raman active nanoparticle assembly body and a flexible polymer; by a way that the substrate is directly affixed to the surface of an object to be detected, or the substrate is rubbed back and forth on the surface of the object to be detected, or the substrate is coiled into a capillary, the adsorption and enrichment capacity of the substrate on the pollutants on the surface of the object to be detected is enhanced, then the on-site rapid in-situ detection of the pollutants on the surface of the object is achieved by a surface enhancing Raman technique. Compared with other detection methods, the method is simple, rapid, low in cost, and beneficial for on-site casual inspection, and has wide application prospects in the fields of environmental monitoring, food safety, medical treatment and health care and the like.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for rapid in-situ detection of pollutants on the surface of objects. Background technique [0002] In recent years, environmental pollution has become increasingly serious, and the problem of residual toxic and harmful pollutants is particularly prominent. For example, the residual pesticides on the surface of fruits and tea in agricultural products, malachite green and crystal violet illegally added in aquaculture, etc., all seriously threaten human health. At present, the detection methods of residual pollutants mainly include high performance liquid chromatography, gas chromatography and enzyme inhibition method. Although these methods have high detection precision and accurate identification, cumbersome sample pretreatment, time-consuming detection cycle and high cost have seriously hindered their popularization and application, especially difficult for on-site rapid sampling. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 郑煜铭钟鹭斌牛琦峰林雪英刘青
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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