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DBD (Dielectric Barrier Discharge) excitation source, DBD-AES (atomic emission spectroscopy) system and detection analysis method of DBD-AES system

A technology of excitation source and power supply system, which is used in electrical excitation analysis, material excitation analysis, etc. It can solve the problems of slow analysis speed, low sensitivity, and the detection limit of the element to be detected cannot reach daily detection, and achieve fast injection flow rate. , high detection frequency, the effect of solving residual and multiple excitation

Active Publication Date: 2016-06-29
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2010, Tombrink et al. did a lot of research work for DBD-AES liquid analysis, and established a liquid electrode dielectric barrier discharge device; in 2012, He et al. reported a DBD device for generating atomic emission spectra from a liquid film; but these devices The disadvantage of the method is that the analysis speed is slow, the sensitivity is low, and the detection limit of the analyte element cannot reach the needs of daily detection.

Method used

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  • DBD (Dielectric Barrier Discharge) excitation source, DBD-AES (atomic emission spectroscopy) system and detection analysis method of DBD-AES system
  • DBD (Dielectric Barrier Discharge) excitation source, DBD-AES (atomic emission spectroscopy) system and detection analysis method of DBD-AES system
  • DBD (Dielectric Barrier Discharge) excitation source, DBD-AES (atomic emission spectroscopy) system and detection analysis method of DBD-AES system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A DBD excitation source such as figure 1 , 2 , 3 and 4, it is an open plasma excitation source, which is composed of electrode one 1, electrode two 2 and power supply system 3, electrode one 1 is a conductive metal sheet (tungsten sheet) 5 attached to the quartz sheet 4, and the electrode Two 2 consists of an atomizer 6 and a metal foil (aluminum foil) 7 wrapped on the side wall of the atomizer outlet 13, the gold foil can also be a tungsten or platinum foil, and the atomizer outlet 13 is perpendicular to the electrode one 1 , a discharge area 18 is formed between the electrode one 1 and the atomizer outlet 13, and the two electrodes are respectively connected to the two poles of the power supply system 3 through wires 8;

[0049] Wherein, a wire 8 is connected on the platinum sheet 5 of the electrode one 1, and another wire 8 is wound outside the metal foil (aluminum foil) 7 of the electrode two 2;

[0050]Described atomizer 6 is the sleeve pipe that is made up of in...

Embodiment 2

[0057] A DBD excitation source, the structure is the same as that of Embodiment 1, the difference is that the conductive metal sheet 5 of electrode one 1 is a platinum sheet; the metal foil sheet 7 wrapped on the side wall of the atomizer outlet by electrode two 2 is a gold foil sheet;

[0058] The thickness of the outer wall of the atomizer 6 is 0.1-0.4 mm; the inner diameter of the sample outlet 12 is 0.3-0.6 mm, the inner diameter of the carrier gas outlet 11 is 0.6-0.9 mm; the thickness of the gold foil 7 is 0.01-0.5 mm;

[0059] The distance between the atomizer outlet 13 and the first electrode is 0.2-1000mm.

Embodiment 3

[0061] A DBD-AES system such as Figure 4 and Figure 5 Shown, by the DBD excitation source among the embodiment 1, sequential injection system 15, carrier gas cylinder 16 and CCD (Charge-CoupledDevice, charge-coupled device) detector 17 form;

[0062] Wherein, the sequential injection system 15 is connected with the sample inlet 10 of the DBD excitation source nebulizer 6, and is used for inputting the liquid sample into the nebulizer 6;

[0063] The carrier gas cylinder 16 is connected to the carrier gas inlet 11 for inputting the carrier gas into the nebulizer 6;

[0064] The CCD detector 17 is located on the side of the electrode discharge area 18, and is used to observe the emission spectrum signal of the object to be measured;

[0065] The carrier gas flow rate of the above system within the detectable range is 0-800mL / min; the liquid flow rate is 0-120μL / s; the sampling frequency is 0-80 times / h.

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Abstract

The invention provides a DBD (Dielectric Barrier Discharge) excitation source, a DBD-AES (atomic emission spectroscopy) system and a detection analysis method of the DBD-AES system to solve the problems existing in DBD-AES system liquid sample introduction in the prior art, and belongs to the technical field of AES detection devices and analysis technologies. The DBD excitation source is an open type plasma excitation source and is composed of a first electrode, a second electrode and a power supplying system, wherein the first electrode is attached to a conductive metal piece on a quartz plate, and the second electrode is composed of an atomizer and conductive metal foil wrapping the side wall of the outlet of the atomizer. The DBD-AES system is composed of the DBD excitation source, a sequence injection system, a carrier-gas cylinder and a CCD detector. An open type DBD plasma and a liquid sampling mode are adopted in the excitation source of the system, it can be guaranteed that liquid samples are directly introduced while the DBD plasma stably discharges, and produced sensitive emission spectra are used for quantitative analysis on an object to be measured; the system is high in sample introduction speed and detection frequency, the analysis efficiency is greatly improved, and the detection time is saved.

Description

technical field [0001] The invention belongs to the technical field of atomic emission spectrum detection equipment and analysis, and in particular relates to a DBD excitation source for liquid sampling, a DBD-AES system and a detection and analysis method thereof. Background technique [0002] Dielectric barrier discharge (DBD) is a non-equilibrium plasma that can be generated at normal temperature and pressure with a simple structure and low energy consumption. The research on the characteristics of DBD plasma has been reported. It is generally believed that when the breakdown voltage exceeds the Pachen breakdown voltage, the gas between the electrodes will be broken down to produce blue-violet light. During the discharge process of DBD, a large number of free radicals and excimers are produced. Their chemical properties are very active, and they can provide energy for the analyte in the analyte, making it atomized or excited from the ground state atom to a higher excited ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/67G01N21/69
CPCG01N21/67G01N21/69
Inventor 于永亮蔡忆张雅洁吴得福王建华
Owner NORTHEASTERN UNIV
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