Atomic vapor generation method and device based on dielectric barrier discharge

A technology of dielectric barrier discharge and steam generation, which is applied in the field of instrument analysis to achieve the effects of improving signal-to-noise ratio, reducing matrix interference, and small volume

Active Publication Date: 2012-06-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on a vapor generation sampling device that uses dielectric barrier discharge for elemental analysis, and it has broad application prospects in atomic fluorescence, atomic emission, atomic absorption and inductively coupled plasma mass spectrometry.

Method used

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  • Atomic vapor generation method and device based on dielectric barrier discharge
  • Atomic vapor generation method and device based on dielectric barrier discharge
  • Atomic vapor generation method and device based on dielectric barrier discharge

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0027] Embodiment 1, flat dielectric barrier discharge atomic vapor generator

[0028] The flat-plate dielectric barrier discharge atomic vapor generator provided in this embodiment includes a cuboid sample chamber 1 surrounded by quartz glass; an electrode 2 is attached to two opposite walls in the length direction of the sample chamber 1, and the The two electrodes 2 are connected to the AC power supply 3 through wires; the two opposite walls in the width direction of the sample chamber 1 are respectively provided with a sample inlet 4 and an air outlet 5, and one wall in the height direction is provided with an air inlet port 6, the carrier gas can enter the sample chamber 1 through the gas inlet 6, forming a stable plasma discharge area in the sample chamber 1, and the sample to be measured enters the above discharge area through the sample inlet 4, and the The element to be tested in the sample to be tested forms atomic vapor, and then enters the instrument to be tested t...

Embodiment 2

[0030] Embodiment 2, round-through dielectric barrier discharge atomic vapor generator

[0031] The round-through type dielectric barrier discharge atomic vapor generator provided in this embodiment includes a cylindrical sample chamber 1' surrounded by quartz glass, and one end of the sample chamber 1' is provided with a sleeve 7 with an open end, and the sleeve 7 The material is rubber, the open end of the sleeve 7 extends to the outside of the sample chamber 1', and the non-open end extends to the cavity of the sample chamber 1'; a ring electrode 8 is attached to the side wall of the sample chamber 1', and the sleeve 7 Filled with a central electrode 9, the ring electrode 8 and the central electrode 9 are connected to the AC power supply 3' through wires; a sample inlet 4' is also provided on the side wall of the sample chamber 1', and the sample opposite to the sleeve 7 is provided. The end of the chamber 1' is provided with a gas outlet 5', the carrier gas can enter the s...

Embodiment 3

[0033] Embodiment 3, round-through dielectric barrier discharge atomic vapor generator

[0034] The round-through dielectric barrier discharge atomic vapor generator provided in this embodiment comprises a cylindrical sample chamber 1" surrounded by quartz glass, two ring electrodes 8' are attached to the outer wall of the sample chamber 1", two ring electrodes 8 'All are connected to the AC power supply 3" through wires; the two ends of the sample chamber 1" are respectively provided with a gas outlet 5" and a sample inlet 4", and on the side wall near the sample inlet 4" There is an air inlet 6", the carrier gas can enter the sample chamber 1" through the air inlet 6", forming a stable plasma discharge area in the sample chamber 1", and the sample to be tested enters the above discharge area through the inlet 4" , then under the action of plasma, the element to be tested in the sample to be tested forms atomic vapor, and then enters the instrument to be tested through the ga...

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Abstract

The invention discloses an atomic vapor generation method and device based on dielectric barrier discharge. The method comprises subjecting a mixture of inert gas and hydrogen gas to dielectric barrier discharge under the action of alternating electric field to generate plasma; and allowing a to-be-measured element in a to-be-measured sample to form atomic vapor under the action of the plasma. The inventive device adopts dielectric barrier discharge in which a large number of free radicals and quasi-molecules, such as H, having a very active chemical property are generated, and the free radicals and the quasi-molecules easily react with to-be-measured atoms or other free radicals to generate hydride vapor, so as to effectively separate from the matrix and enter a to-be-measured region; matrix interference brought in by a sample pre-treatment process is reduced to therefore improve the signal to noise ratio of the analyzer and reduce the instrument detection limit, and the device is simple and easy to operate; and dielectric barrier discharge can be realized under the atmospheric pressure, so as to realize small volume, low energy consumption and low gas temperature.

Description

technical field [0001] The invention relates to a method and device for generating atomic vapor based on dielectric barrier discharge, and belongs to the technical field of instrument analysis. Background technique [0002] The combination of hydride generation (HG) with atomic fluorescence, atomic absorption, plasma emission spectroscopy and plasma mass spectrometry is an analytical technique with great practical value. Traditional hydride generation often uses potassium borohydride-hydrochloric acid reduction system. Because the potassium borohydride-hydrochloric acid reducing system shows superiority in many aspects such as reducing ability, reaction speed, automatic operation, anti-interference degree and applicable element number. However, the potassium borohydride-hydrochloric acid reduction system consumes a large amount of reagents and brings inevitable waste liquid treatment; on the other hand, potassium borohydride is a flammable item when it is wet, which is stron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/67G01N27/68
Inventor 邢志杨萌张四纯张新荣
Owner TSINGHUA UNIV
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