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An Aerosol-Assisted Laser Probe Method for Detecting the Spectrum of Molecular Free Radicals

An auxiliary laser and probe detection technology, which is applied in the field of plasma emission spectroscopy, can solve the problems of complex and unreliable detection methods, influence on spectra, and low detection sensitivity of laser probes, and achieve simple and reliable detection methods, less optical path changes, The effect of reducing the matrix effect

Active Publication Date: 2020-07-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a method for detecting molecular free radical spectrum with an aerosol-assisted laser probe, thereby solving the problem of complex and unreliable detection method, influence of matrix spectrum on non-metallic element spectrum, Technical problem of low detection sensitivity of laser probes to non-metallic elements

Method used

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  • An Aerosol-Assisted Laser Probe Method for Detecting the Spectrum of Molecular Free Radicals
  • An Aerosol-Assisted Laser Probe Method for Detecting the Spectrum of Molecular Free Radicals
  • An Aerosol-Assisted Laser Probe Method for Detecting the Spectrum of Molecular Free Radicals

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Experimental program
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Effect test

Embodiment 1

[0037] Taking the detection of chlorine element in sodium chloride as an example, the method is described in detail.

[0038] The selected sample is sodium chloride, and the content of chlorine element is 60.68wt%.

[0039] The laser was selected as Brilliant laser from Quantel Company of France, and the spectrometer was selected as SCT320 spectrometer from Princeton Instrument Company. Select Ca-C1 free radical A 2 Π-X 2 The (0,0)618.5nm and 621.1nm spectral lines in the Σ energy band are observation lines.

[0040] (1) Compress the analytically pure sodium chloride powder into a disc sample with a diameter of 4 mm, configure a calcium bromide solution with a concentration of 1 g / ml, and use an ultrasonic atomizer to atomize the calcium bromide solution into an aerosol state and spray it on the near the surface of the NaCl sample;

[0041] (2) Turn on the Brilliant laser to output the laser, ablate the surface of the sodium chloride sample, generate plasma on the surface ...

Embodiment 2

[0046] Taking the detection of fluorine in sodium fluoride as an example, the method is described in detail.

[0047] The selected sample is sodium fluoride with a fluorine element content of 45.24%.

[0048] The laser chooses the Ultra50 laser of American Bigsky Company, and the spectrometer chooses the SR-500i spectrometer of Andor Company. Select Ca-F radical A 2 Π-X 2 The (0,0)606.4nm spectral line in the Σ energy band is the observation line.

[0049] (1) Compress the analytically pure sodium fluoride powder into a disc sample with a diameter of 4mm, configure 4ml of calcium bromide solution with a concentration of 1g / ml, use an ultrasonic atomizer to atomize the calcium bromide solution into an aerosol state, and then spray Near the surface of the sodium fluoride sample;

[0050] (2) Turn on the Ultra50 laser to output the laser, ablate the surface of the sodium chloride sample, and generate plasma on the surface of the sodium chloride sample, the chlorine in the sod...

Embodiment 3

[0055] Calcium bromide solutions with different concentrations are prepared, and the method is described in detail by taking the detection of fluorine in sodium fluoride as an example.

[0056] The selected sample is sodium fluoride with a fluorine element content of 45.24%.

[0057] The laser chooses the Brilliant laser of Quantel Company in France, and the spectrometer chooses the SR-500i spectrometer of Andor Company. Select Ca-F radical A 2 Π-X 2 The (0,0)606.4nm spectral line in the Σ energy band is the observation line.

[0058] (1) Compress the analytically pure sodium fluoride powder into a disc sample with a diameter of 4mm, configure 4ml of calcium bromide solution with a concentration of 0.5g / ml and 1g / ml, and use an ultrasonic atomizer to atomize the calcium bromide solution into Spray near the surface of the sodium fluoride sample after the aerosol state;

[0059] (2) Turn on the Ultra50 laser to output the laser, ablate the surface of the sodium chloride samp...

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Abstract

The invention discloses a method for detecting a molecular free radical spectrum through an aerosol-assistant laser probe. The method includes the steps that a solution containing metallic elements isatomized into aerosol, the aerosol is put on the periphery of a to-be-detected sample containing non-metallic elements, the to-be-detected sample is ablated through laser, and the non-metallic elements in the to-be-detected sample are combined with metallic elements in the aerosol to generate free radical molecules; fluorescence spectrum signals transmitted by the free radical molecules are detected, and the type and the content of the non-metallic elements in the to-be-detected sample are obtained. The method is simple and reliable, the influence of a base-body spectrum on a non-metallic-element spectrum is avoided, and the detection sensitivity of the laser probe for the non-metallic elements is improved.

Description

technical field [0001] The invention belongs to the field of laser plasma emission spectroscopy, and more specifically relates to a method for detecting molecular free radical spectroscopy with an aerosol-assisted laser probe. Background technique [0002] Laser probe, also called laser-induced breakdown spectroscopy (LIBS for short), is an atomic emission spectroscopy analysis technique. The basic principle is to use a pulsed laser beam to ablate plasma on the surface of the sample to be tested, and to obtain the type and content information of the elements contained in the sample by collecting and analyzing the emission spectrum of the plasma. Due to the characteristics of all-element detection, fast, real-time, online, and remote analysis, laser probes have received extensive attention from domestic and foreign researchers for many years. [0003] However, due to the special structure of non-metallic element atoms, the excitation energy required for the electronic energy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/71G01N21/01G01N21/64
CPCG01N21/01G01N21/6402G01N21/718
Inventor 李祥友张闻李嘉铭周冉杨平刘坤高培源闫久江李婉婷郝中骐郭连波曾晓雁
Owner HUAZHONG UNIV OF SCI & TECH