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Method for detecting organic pollutants by virtue of combination of solid phase micro-extraction and surface enhancement Raman

Active Publication Date: 2015-03-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid-phase microextraction has the following disadvantages in practical application: 1) the equipment is relatively expensive, 2) the coating is limited, 3) the fused quartz fiber extraction probe is easy to break, 4) the combination of solid-phase microextraction and chromatography and other instruments to analyze samples time consuming

Method used

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  • Method for detecting organic pollutants by virtue of combination of solid phase micro-extraction and surface enhancement Raman
  • Method for detecting organic pollutants by virtue of combination of solid phase micro-extraction and surface enhancement Raman
  • Method for detecting organic pollutants by virtue of combination of solid phase micro-extraction and surface enhancement Raman

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1, the extraction and detection of a single polycyclic aromatic hydrocarbon

[0051] Directly immerse the solid-phase microextraction probe as a surface-enhanced Raman active substrate into 25mL fluoranthene (concentration of 10 -5 M) solution, under 25 DEG C of stirring conditions, extraction 3h, then the solid-phase microextraction probe is placed on the Raman detection platform, laser irradiation solid-phase microextraction probe obtains the Raman characteristic peak of single polycyclic aromatic hydrocarbon, as image 3 As shown, the excitation wavelength is 785nm, the laser power is 440W, and the integration time is 1s.

[0052] Depend on image 3 It can be seen that the Raman shift of fluoranthene solution is at 565cm -1 ,1104cm -1 ,1612cm -1 , which is consistent with the Raman shift of fluoranthene powder.

Embodiment 2

[0053] Example 2, the extraction and detection of mixed polycyclic aromatic hydrocarbons

[0054] The solid-phase microextraction probe was directly immersed in the mixed solution of 25mL PAHs (10 -5 M fluoranthene, 10 -5 M pyrene, 10 -7 M benzo[b]fluoranthene), under stirring conditions at 25°C, extract for 3h, then place the solid-phase microextraction probe on the Raman detection platform, and irradiate the solid-phase microextraction probe with laser to obtain the Raman ratio of mixed polycyclic aromatic hydrocarbons characteristic peaks, such as Figure 4 As shown, the excitation wavelength is 785nm, the laser power is 440W, and the integration time is 1s.

[0055] From Figure 4 It can be seen that the Raman shift of the fluoranthene solution is at 565cm -1 ,1104cm -1 ,1612cm -1 , which is consistent with the Raman shift of fluoranthene powder. The Raman shift of pyrene solution is at 408cm -1 ,597cm -1 ,1411cm -1 ,1599cm -1 ,1630cm -1 , which is consistent ...

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Abstract

The invention relates to a method for detecting organic pollutants by virtue of combination of solid phase micro-extraction and surface enhancement Raman. The method comprises the following steps: with a solid phase micro-extraction probe as a surface enhancement Raman active substrate, extracting for 3-10 hours in the to-be-detected environment under the stirring condition with the temperature of 20-30 DEG C, then putting the solid phase micro-extraction probe on a Raman detection platform, irradiating the solid phase micro-extraction probe by using laser to obtain Raman characteristic peaks of the to-be-detected organic pollutants, and analyzing the detected organic pollutants according to the Raman characteristic peaks. The method for detecting the organic pollutants is integrated with the advantages of the solid phase micro-extraction technology and the surface enhancement Raman technology; the organic pollutants in the environment can be quickly analyzed and detected; the sameness analysis of polyaromatic hydrocarbon can be realized; polyaromatic hydrocarbon mixtures can be detected and analyzed.

Description

technical field [0001] The invention relates to a method for detecting organic pollutants by combining solid-phase microextraction and surface-enhanced Raman, belonging to the field of analytical chemistry. Background technique [0002] With the increasingly serious environmental pollution, human survival and health are seriously threatened, especially the accumulation of organic pollutants through the food chain amplifies the toxicity of organic pollutants. Among them, polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons, PAHs) are a typical class of organic pollutants, which have received extensive attention due to their high toxicity, persistence, lipophilicity and hydrophobicity, strong carcinogenicity and bioaccumulation. , so it is very important to establish a new method for the detection and rapid analysis of PAHs. Since the content of PAHs in nature is low, the enrichment concentration of PAHs is particularly important. Traditional separation and enr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 占金华刘翠翠
Owner SHANDONG UNIV
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