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Surface enhanced Raman spectroscopy method for organo-chlorine pesticide residues of fruits and vegetables

A surface-enhanced Raman, pesticide residue technology, applied in Raman scattering, measurement devices, material analysis by optical means, etc., can solve the problems of submersion, low sensitivity, weak Raman scattering intensity, etc., to achieve accuracy and precision High degree of detection, improved detection accuracy, and minimal damage

Inactive Publication Date: 2018-11-27
JIANGSU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the intensity of Raman scattering is very weak, the sensitivity is low, and sometimes it will be submerged in the fluorescence signal of molecules

Method used

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  • Surface enhanced Raman spectroscopy method for organo-chlorine pesticide residues of fruits and vegetables

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Embodiment 1

[0028] Taking the detection of the residual amount of pentachlorophenol in apples as an example, the specific embodiment of the present invention is described in detail.

[0029] The described rapid detection method of organochlorine pesticide residues in fruits and vegetables comprises 5 steps:

[0030] Step 1 The preparation method of the copper substrate is as follows: first cut the copper foil into small pieces of 0.5 cm × 0.5 cm, then ultrasonically in acetone, ethanol and ultrapure water for 10 minutes, and finally soak the copper foil in 0.1M nitric acid to Remove the oxide layer on its surface. The treated copper foil was rinsed with ultrapure water and dried for later use.

[0031] The deposition method of silver nanoparticles on the surface of step 2 copper foil comprises the following two processes:

[0032] Process 1: soak the copper foil in 0.01M stannous chloride and 0.01M hydrochloric acid for 1min, and dry at room temperature;

[0033] Process 2: Soak the co...

Embodiment 2

[0038] Taking the detection of the residual amount of pentachlorophenol in apples as an example, the specific embodiment of the present invention is described in detail.

[0039] The described rapid detection method of organochlorine pesticide residues in fruits and vegetables comprises 5 steps:

[0040] Step 1 The preparation method of the copper substrate is as follows: first cut the copper foil into small pieces of 2.0cm×2.0cm, then ultrasonically 30min each in acetone, ethanol and ultrapure water, and finally soak the copper foil in 0.5M nitric acid to Remove the oxide layer on its surface. The treated copper foil was rinsed with ultrapure water and dried for later use.

[0041] The deposition method of silver nanoparticles on the surface of step 2 copper foil comprises the following two processes:

[0042] Process 1: soak the copper foil in 0.05M stannous chloride and 0.05M hydrochloric acid for 5min, and dry at room temperature;

[0043] Process 2: Soak the copper foi...

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Abstract

The invention discloses a surface enhanced Raman spectroscopy method for organo-chlorine pesticide residues of fruits and vegetables and belongs to the technical field of detection methods of pesticide residues. The method comprises the following steps: 1, preparing a copper foil substrate; 2, depositing silver nanoparticles on the surface of the copper foil; 3, modifying mercapto on the substrate; 4, performing surface enhanced Raman spectroscopy on organo-chlorine pesticide standard products; and 5, detecting the pesticide residues of the fruits and vegetables. According to the method disclosed by the invention, the sample pretreatment is simple, the detection speed is high, the detection cycle is shortened, the cost is low, and rapid detection of micro / trace pesticides of the fruits andvegetables is realized.

Description

technical field [0001] The invention belongs to the technical field of pesticide residue detection methods, in particular to a pesticide residue detection method using surface-enhanced Raman spectroscopy. Background technique [0002] Fruits and vegetables are the main providers of essential vitamins and trace elements for the human body. However, pesticides are widely used in the growth process of fruits and vegetables, mainly for killing insects, fungi and other organisms that harm crop growth, as well as affecting plant metabolism or increasing crop yield. With the development of science and technology, the variety and quantity of chemical pesticides are constantly increasing, and the long-term and extensive use and abuse of pesticides has caused pesticide pollution problems to occur from time to time, and the pesticide residues exceed the standard quite seriously and increase year by year. Even small traces of agricultural residues can be harmful to the human body. Long...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 邹小波黄晓玮石海军石吉勇李志华史永强蒋彩萍
Owner JIANGSU UNIV
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