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Method for rapidly detecting trace amount pentachlorinated biphenyl

A pentachlorobiphenyl and trace technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of trace detection difficulties and achieve high sensitivity, low cost and simple method

Inactive Publication Date: 2009-04-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to be based on a highly sensitive surface-enhanced Raman substrate, and it is difficult to detect trace amounts of water-insoluble organic substances.

Method used

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  • Method for rapidly detecting trace amount pentachlorinated biphenyl
  • Method for rapidly detecting trace amount pentachlorinated biphenyl
  • Method for rapidly detecting trace amount pentachlorinated biphenyl

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Ultrasonic cleaning the silicon substrate with acetone, alcohol, and deionized water one by one and drying it;

[0027] 2. Fix the pretreated substrate 1 on the sample stage of the electron beam evaporation coating machine;

[0028] 3. Using metallic silver as the target material, the target material is image 3 Medium solid matter 4 and molten matter 5, the chamber of the electron beam evaporation coating machine is pumped to 3×10 -5 Pa high vacuum;

[0029] 4. Use liquid nitrogen to reduce the temperature of the sample stage to 230K;

[0030] 5. Adjust the incident angle of the electron beam 6 from 3 to 80 degrees, and rotate the sample stage at a rate of 0.2rpm, and grow a 500nm thick silver deposition film 2 obliquely on the substrate 1 of the sample stage;

[0031] 6. Dissolve the trace amount of pentachlorobiphenyl to be measured in acetone;

[0032] 7. Put the surface-enhanced Raman substrate prepared in steps 1 to 5 into the solution to be tested prepared...

Embodiment 2

[0036] 1. Clean the glass substrate one by one with acetone, alcohol and deionized water ultrasonically and dry it;

[0037] 2. Fix the pretreated substrate 1 on the sample stage of the electron beam evaporation coating machine;

[0038] 3. Using metallic silver as the target material, the target material is image 3 Medium solid matter 4 and molten matter 5, the chamber of the electron beam evaporation coating machine is pumped to 3×10 -5 Pa high vacuum;

[0039] 4. Use liquid nitrogen to reduce the temperature of the sample stage to 230K;

[0040] 5. Adjust the incident angle of the electron beam 6 from 3 to 85 degrees, and make the sample stage stationary, and grow an 800nm ​​thick silver deposition film 2 obliquely on the substrate 1 of the sample stage;

[0041] 6. Dissolve the trace amount of pentachlorobiphenyl to be measured in acetone;

[0042] 7. Use a micropipette to drop 2 μL of the solution to be tested prepared in step 6 onto the surface-enhanced Raman substr...

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Abstract

The invention discloses a method used for quickly detecting trace pentachlorinated biphenyl by surface enhanced Raman Effect, belonging to the field of trace organic pollutant detection technique. The method deposits metal silver on a substrate by a temperature-controlled inclination growth method, thus obtaining nanometer inclined rod or cylindrical array film with good discreteness; the silver film is used as surface reinforced Raman substrate which has excellent surface reinforced effect and can defect trace pentachlorinated biphenyl; the pentachlorinated biphenyl is dissolved in acetone; by virtue of strong volatility of the acetone, the acetone is volatile under a certain vacuum and temperature, thus realizing the no-interference detection of trace pentachlorinated biphenyl; finally, by the surface reinforced Raman effect, the Raman spectrogram measurement can be carried out on the unique silver film surface reinforced Raman substrate attached by trace pentachlorinated biphenyl, thus achieving the detection of trace pentachlorinated biphenyl. The detection method is simple and quick, has low cost and high sensitiveness, and has wide application prospect in the aspect of detection of organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of trace organic pollutant detection, in particular to a method for rapidly detecting trace pentachlorobiphenyl by utilizing surface-enhanced Raman effect. Background technique [0002] Pentachlorobiphenyl is a homologue of polychlorinated biphenyl, insoluble in water, easily soluble in organic solvents, difficult to decompose, and highly toxic. Polychlorinated biphenyls have high thermal stability and excellent dielectric properties, and have been widely used in capacitors, transformer oils and heat transfer carriers. Since the beginning of production and continuous large-scale use in the late 1920s, the scope of pollution is extremely wide and it is very harmful to people's health. It is one of the first batch of persistent organic pollutants restricted by the Stockholm Convention. [0003] At present, the internationally recognized method for detecting POPs is mainly high-resolution gas chromatography-ma...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 张政军周钦
Owner TSINGHUA UNIV
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