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A rapid detection method for dioxin-like pollutants based on enhanced Raman spectroscopy

A dioxin type and detection method technology, applied in the detection field, can solve the problems of limited application, interference with dioxin detection, weak Raman spectral characteristic peak signal, etc., so as to improve detection sensitivity, optimize Raman conditions, and reduce detection cost effect

Active Publication Date: 2021-12-31
厦门鹭曼科技合伙企业(有限合伙)
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the disadvantages of poor stability and easy oxidation of the Ag-based SERS substrate, the SERS activity will soon be lost, resulting in the inability to achieve the enhancement of the dioxin Raman signal (generally it will be inactivated within a few hours), seriously This limits the application of this method in practical detection
In addition, this method needs to introduce methyl cellulose to stabilize silver nanoparticles and realize the adsorption of dioxins on the surface of nanoparticles, but methyl cellulose itself also has abundant Raman signals and will significantly interfere with the detection of dioxins.
At the same time, this method is complicated to operate and is only suitable for laboratory testing, which cannot meet the needs of rapid on-site testing.
[0005] Therefore, it is urgent to develop a SERS method for detecting the concentration of dioxin-like pollutants, which can quickly detect the concentration of dioxin-like pollutants outdoors, and can solve the problems of weak Raman spectrum characteristic peak signal and poor detection stability.

Method used

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  • A rapid detection method for dioxin-like pollutants based on enhanced Raman spectroscopy
  • A rapid detection method for dioxin-like pollutants based on enhanced Raman spectroscopy
  • A rapid detection method for dioxin-like pollutants based on enhanced Raman spectroscopy

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preparation example Construction

[0042] The preparation method of gold nanoparticles in the step 2 is as follows:

[0043]Step a, adding the chloroauric acid solution into the ultrapure water, fully mixing, stirring at high speed and boiling;

[0044] In step b, the sodium citrate solution is quickly added to the chloroauric acid solution in step a, stirring and boiling is continued for 30 minutes, and the gold nanoparticles are cooled.

[0045] The particle size of the gold nanoparticles is one of 16nm, 45nm and 55nm.

[0046] The selection method of the particle diameter of described gold nanoparticle is as follows:

[0047] Fully mix the stock solution with a known concentration and gold nanoparticles, add it to the detection pool, use a portable Raman spectrometer to collect Raman information, and make a blank comparison, and find the best gold nanoparticle based on the Raman spectrum. Particles, determine the particle size of the gold nanoparticles.

[0048] The selection method of described agglomera...

Embodiment 1

[0052] A kind of 2,8-dichlorodibenzo-p-dioxin rapid detection method based on enhanced Raman spectroscopy, comprising the steps:

[0053] (1) Determination of the characteristic peaks of 2,8-dichlorodibenzo-p-dioxin

[0054] Step 1, configure the standard solution of the substance to be detected, and dilute it according to the standard solution to form a stock solution, and use a portable Raman spectrometer to collect the Raman information of the standard solution and the blank solution to determine the characteristic peaks; When the standard solution is at a low concentration (≤0.1%), add 55nm gold particles as reinforcing particles and sodium chloride as an agglomerating agent, and the sodium chloride is a 1M NaCl solution; at the same time, in order to reduce the complexity of detection, standard solution and stock solution The solution to be tested can be used at the same concentration.

[0055] Take 200 μL of 50 μg / L stock solution, 200 μL of 55nm Au NPs and 1M NaCl and ...

Embodiment 2

[0071] The detection of embodiment 2 multiple dioxins

[0072] (1) Detection of characteristic peaks

[0073] Take 200 μL of 50 μg / L stock solution, 200 μL of 55nm Au NPs and 1M NaCl and mix them evenly in a clean detection cell, use a portable Raman spectrometer to collect Raman information, and make a comparison with the blank sample. like figure 1 , b, c and d are 2,3,7-trichlorodibenzo-p-dioxin, 1,2,3,7,8-pentachlorodibenzo-p-dioxin and 1,2 , The Raman spectrum of 4,7,8-pentachlorodibenzo-p-dioxin, the surface-enhanced Raman characteristic peak of 2,3,7-trichlorodibenzo-p-dioxin is: 345cm -1 、377cm -1 、443cm -1 、541cm -1 、584cm -1 、1230cm -1 、1309cm -1 、1487cm -1 and 1602cm -1 , of which, 1230cm -1 is the main peak, and the rest are used as auxiliary peaks to judge and identify 2,3,7-trichlorodibenzo-p-dioxin; 1,2,3,7,8-pentachlorodibenzo-p-dioxin The surface-enhanced Raman characteristic peak is: 380cm -1 、527cm -1 、559cm -1 、578cm -1 、1243cm -1 、1304cm ...

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Abstract

The invention discloses a rapid detection method for dioxin-like pollutants based on enhanced Raman spectrum technology, which includes configuring a standard solution, diluting it according to the standard solution to form a stock solution, and simultaneously using a portable The Raman spectrometer collects the Raman information of the standard solution and the blank solution to determine the characteristic peaks; the enhanced particles, agglomerating agent and stock solution are added to the detection pool and mixed evenly, and the Raman information is collected by a portable Raman spectrometer to obtain the characteristic peak information. And enter it into the Raman spectrometer library; in the actual detection, the enhanced particles, agglomerating agent and sample are added to the detection cell and mixed evenly, and the Raman information is collected by a portable Raman spectrometer, and the sample is detected according to the characteristic peak of the analyte. The concentration of the analyte. The present invention can use a portable Raman spectrometer, supplemented by a Raman information comparison method to realize on-site rapid detection, and optimize Raman conditions under the action of enhanced particles and agglomerating agents, thereby improving the detection limit.

Description

technical field [0001] The invention belongs to the detection field, and in particular relates to a rapid detection method for dioxin-like pollutants based on enhanced Raman spectrum technology. Background technique [0002] Dioxins generally refer to a group of polychlorinated substituted planar aromatic hydrocarbons with similar structures and physical and chemical properties, belonging to chlorinated oxygen-containing tricyclic aromatic hydrocarbons, including 75 polychlorinated dibenzo-one-to-one dioxins and 135 polychlorinated dibenzofurans. Dioxin is a class of highly toxic substances, and its toxicity is equivalent to 130 times that of the well-known highly toxic substance cyanide and 900 times that of arsenic. A large number of animal experiments have shown that very low concentrations of dioxins have lethal effects on animals. Dioxins may also lead to poor fetal growth and a significant reduction in the number of sperm in men. The ways it invades the human body in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 程芳芳孙燕娜
Owner 厦门鹭曼科技合伙企业(有限合伙)
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