阅读说明：本技术 一种氢化物发生-大气压辉光放电原子光谱装置 (Hydride generation-atmospheric pressure glow discharge atomic spectrum device ) 是由 汪正 彭晓旭 于 2018-08-01 设计创作，主要内容包括：一种氢化物发生-大气压辉光放电原子光谱装置,该装置包括：T型三通阀；设置在所述T型三通阀上的大气压辉光放电发生区；向所述大气压辉光放电发生区输入载气以及待分析样品并与所述T型三通阀连通的氢化物发生区；设置在所述T型三通阀上,用于对所述大气压辉光放电发生区进行冷却的冷却系统；接收所述大气压辉光放电发生区产生的原子发射光谱信号的检测系统；为所述大气压辉光放电发生区放电提供电能的电源系统。本发明进一步简化了大气压辉光放电激发源装置的结构,并提高了装置的集成度。(A hydride generation-atmospheric pressure glow discharge atomic spectroscopy device, the device comprising: a T-shaped three-way valve; an atmospheric glow discharge generation region arranged on the T-shaped three-way valve; a hydride generating area which inputs carrier gas and a sample to be analyzed to the atmospheric pressure glow discharge generating area and is communicated with the T-shaped three-way valve; the cooling system is arranged on the T-shaped three-way valve and is used for cooling the atmospheric glow discharge generating area; a detection system for receiving the atomic emission spectrum signal generated by the atmospheric pressure glow discharge generation area; and the power supply system is used for providing electric energy for the discharge of the atmospheric pressure glow discharge generation area. The invention further simplifies the structure of the atmospheric glow discharge excitation source device and improves the integration level of the device.)

1. A hydride generation-atmospheric pressure glow discharge atomic spectrum device is characterized in that,

the device includes:

a T-shaped three-way valve;

an atmospheric glow discharge generation region arranged on the T-shaped three-way valve;

a hydride generating area which inputs carrier gas and a sample to be analyzed to the atmospheric pressure glow discharge generating area and is communicated with the T-shaped three-way valve;

the cooling system is arranged on the T-shaped three-way valve and is used for cooling the atmospheric glow discharge generating area;

a detection system for receiving the atomic emission spectrum signal generated by the atmospheric pressure glow discharge generation area;

and the power supply system is used for providing electric energy for the discharge of the atmospheric pressure glow discharge generation area.

2. A hydride generation-atmospheric pressure glow discharge atomic spectroscopy device according to claim 1,

the atmospheric pressure glow discharge generation area comprises a first high-temperature-resistant quartz tube, a second high-temperature-resistant quartz tube with the size different from that of the first high-temperature-resistant quartz tube, a hollow electrode and a hollow counter electrode.

3. A hydride generation-atmospheric pressure glow discharge atomic spectroscopy device according to claim 2,

in the atmospheric pressure glow discharge generation area, the hollow electrode is embedded in a first high-temperature-resistant quartz tube with matched size, and the outer wall of the hollow electrode is attached to the inner wall of the first high-temperature-resistant quartz tube.

4. A hydride generation-atmospheric pressure glow discharge atomic spectroscopy device according to claim 2,

the atmospheric pressure glow discharge generation area is embedded with the hollow electrode by adopting a second high-temperature-resistant quartz tube, the first high-temperature-resistant quartz tube and the hollow counter electrode are fixed into a whole, and the hollow electrode and the hollow counter electrode are coaxial.

5. A hydride generation-atmospheric pressure glow discharge atomic spectroscopy device according to claim 1,

the hydride generating area adopts inert gas as a discharge medium of atmospheric pressure glow discharge and a sample transmission carrier gas.

6. A hydride generation-atmospheric pressure glow discharge atomic spectroscopy device according to claim 1,

the T-shaped three-way valve adopts a PTFE pipe with adaptive size to fix the atmospheric pressure glow discharge generation area on the T-shaped three-way valve.

7. A hydride generation-atmospheric pressure glow discharge atomic spectroscopy device according to claim 1,

the cooling system is used for cooling by introducing cooling air between the high-temperature-resistant quartz tube arranged at the outer side of one end of the T-shaped three-way valve and the first high-temperature-resistant quartz tube embedded with the hollow electrode.

8. A hydride generation-atmospheric pressure glow discharge atomic spectroscopy device according to claim 1,

the hydride generation zone comprises: peristaltic pump, sample transmission silicone tube, T type reaction piece, gas-liquid separator, gas flowmeter, drier.

9. A hydride generation-atmospheric pressure glow discharge atomic spectroscopy device according to claim 1,

and in the atmospheric pressure glow discharge generation area, the hollow electrode is directly contacted with the hollow counter electrode through connecting a current stabilizing resistor with the resistance value of 2.5-12 k omega in series to trigger and generate atmospheric pressure glow discharge micro plasma.

10. A hydride generation-atmospheric pressure glow discharge atomic spectroscopy device according to claim 1,

the detection system is characterized in that an optical fiber probe of a micro spectrometer is axially arranged along the atmospheric pressure glow discharge generation area, and an ultraviolet fused quartz plane window is arranged between the atmospheric pressure glow discharge generation area and the optical fiber probe.

Technical Field

The invention belongs to the field of atomic spectrum analysis, relates to the technical field of atomic emission spectrum excitation sources, and more particularly relates to a hydride generation-atmospheric pressure glow discharge atomic spectrum device which can be applied to the field of atomic emission spectrum.

Background

With the rapid development of national economic construction and social life, the problems of heavy metal pollution in the environment, heavy metal residue in food and the like are increasingly prominent, and a new challenge is provided for the current analysis and test technology. Today, the most common detection method for micro, trace metal element analysis is mainly atomic spectroscopy/mass spectrometry. Based on the characteristics of high sensitivity, wide linear range and the like, the method becomes an irreplaceable basic analytical instrument in a plurality of fields such as environment, chemical engineering, biology and the like. However, these instruments are bulky, power intensive, require inert gases, even hazardous gases, and are expensive, which limits the miniaturization and portable development of the instrument and makes it difficult to use for on-site analysis and monitoring. The atmospheric pressure glow discharge micro-plasma is plasma with the size limited to millimeter level or even lower, has the characteristics of operation under atmospheric pressure, small volume, low power consumption, stability of spectral measurement and the like, and is easy to realize miniaturization and field analysis. Therefore, the research work of developing the atomic emission spectrum excitation source based on the atmospheric pressure glow discharge micro-plasma has important significance for the portable development of atomic spectrum instruments.

The existing atmospheric pressure glow discharge device applied to an excitation source of an atomic emission spectrum has low detection sensitivity on partial heavy metal elements (such as arsenic, lead, germanium and the like) and high detection limit, and cannot meet the requirement of micro-trace analysis. According to the methods for separating and pre-enriching some elements, such as hydride generation and the like, target elements in a sample are pre-enriched and then excited by using an atomic emission spectrum excitation source, so that the interference of a matrix is effectively reduced, and the selectivity and detection sensitivity of element analysis and the like are improved. Meanwhile, because different elements excite different concentrated positions in the atmospheric pressure glow discharge, when the atomic emission spectroscopy is applied, the optical radiation signals of specific positions in an atmospheric pressure glow discharge generation area need to be selectively collected aiming at the different elements, so that the complexity of element analysis is increased to a certain extent, and the detection stability and sensitivity of the signals are influenced.

In conclusion, according to the excitation characteristic of the atmospheric pressure glow discharge to elements, the atmospheric pressure glow discharge is improved, the structure of the atmospheric pressure glow discharge excitation source device is further simplified, the excitation intensity of different elements is improved under low power consumption, meanwhile, the sensitivity of signal acquisition is improved through the acquisition mode of the atmospheric pressure glow discharge light radiation signals, and the realization that the portable low-power-consumption micro-plasma device can be used for carrying out high-sensitivity and high-selectivity analysis on the elements is a key problem to be solved urgently in the field at present.

Disclosure of Invention

In view of the above, according to the characteristics of atomic emission spectroscopy, the technical problems to be solved by the present invention are to optimally design an atmospheric pressure glow discharge microplasma device, simplify the structure of the whole device, improve the integration level of the whole structure design, and improve the sensitivity of signal detection when the atmospheric pressure glow discharge microplasma device is applied to atomic emission spectroscopy by improving the discharge energy density of the atmospheric pressure glow discharge microplasma device and improving the acquisition mode of atomic emission spectroscopy signals.

In order to achieve the above object, the present invention provides the following technical solutions:

a hydride generation-atmospheric pressure glow discharge atomic spectroscopy device, the device comprising: a T-shaped three-way valve;

an atmospheric glow discharge generation region arranged on the T-shaped three-way valve;

a hydride generating area which inputs carrier gas and a sample to be analyzed to the atmospheric pressure glow discharge generating area and is communicated with the T-shaped three-way valve;

the cooling system is arranged on the T-shaped three-way valve and is used for cooling the atmospheric glow discharge generating area;

a detection system for receiving the atomic emission spectrum signal generated by the atmospheric pressure glow discharge generation area;

and the power supply system is used for providing electric energy for the discharge of the atmospheric pressure glow discharge generation area.

Preferably, the T-shaped three-way valve is a stainless steel T-shaped three-way valve.

The invention further simplifies the structure of the atmospheric glow discharge excitation source device and improves the integration level of the device.

Preferably, in the hydride generation-atmospheric pressure glow discharge atomic spectrum device, the atmospheric pressure glow discharge generation region includes a first high temperature-resistant quartz tube, a second high temperature-resistant quartz tube having a different size from the first high temperature-resistant quartz tube, a hollow electrode, and a hollow counter electrode. Preferably, in the hydride generation-atmospheric pressure glow discharge atomic spectrum device, in the atmospheric pressure glow discharge generation region, the hollow electrode is embedded in a first high temperature resistant quartz tube with a matched size, and the outer wall of the hollow electrode is attached to the inner wall of the high temperature resistant quartz tube. More preferably, the inner diameter of the first high-temperature resistant quartz tube is 1.4-1.8 mm, and the outer diameter is 2.8-3.2 mm.

In the invention, the hollow electrode is embedded in the first high-temperature-resistant quartz tube with the adaptive size, so that the effective volume of glow discharge is limited, and the discharge energy density is improved. Preferably, in the hydride generation-atmospheric pressure glow discharge atomic spectrum device, the atmospheric pressure glow discharge generation region adopts a second high temperature resistant quartz tube to fix the first high temperature resistant quartz tube embedded with the hollow electrode and the hollow counter electrode into a whole, and keeps the hollow electrode and the hollow counter electrode coaxial. More preferably, the inner diameter of the second high-temperature resistant quartz tube is 2.8-3.2 mm, and the outer diameter is 3.8-4.2 mm.

By means of the design of the atmospheric pressure glow discharge generating area, the high integration level of the atmospheric pressure glow discharge area is ensured, and the hollow electrode and the hollow counter electrode are coaxial, so that the spectral signal is allowed to be acquired along the axial direction of the atmospheric pressure glow discharge generating area.

Preferably, in the hydride generation-atmospheric pressure glow discharge atomic spectroscopy device, the hydride generation region uses an inert gas (He or Ar) as a discharge medium of the atmospheric pressure glow discharge and a sample transport carrier gas.

By means of this, on the one hand, for transporting the products of the hydride generation zone to the atmospheric pressure glow discharge generation zone; and on the other hand, a certain medium foundation is provided for triggering and maintaining the atmospheric pressure glow discharge micro-plasma.

Preferably, in the hydride generation-atmospheric pressure glow discharge atomic spectrum device, the T-shaped three-way valve adopts a PTFE (polytetrafluoroethylene, for short, for poly tetra fluoro ethylene) tube with a suitable size to fix the atmospheric pressure glow discharge generation region on the T-shaped three-way valve.

By means of the method, the integration level of the whole device is improved to a certain extent.

Preferably, in the hydride generation-atmospheric pressure glow discharge atomic spectrum device, the cooling system is configured to cool the substrate by introducing a cooling gas between an outer high temperature-resistant quartz tube installed at one end of the T-shaped three-way valve and a high temperature-resistant quartz tube having a hollow electrode embedded therein.

By virtue of this, the cooling system ensures that the hollow electrode and the hollow counter electrode are not excessively worn under high intensity discharge in the present invention.

Preferably, in the hydride generation-atmospheric pressure glow discharge atomic spectrum device, the hydride generation region includes a peristaltic pump, a sample transmission silicone tube, a T-shaped reaction block, a gas-liquid separator, a gas flow meter, and a drying agent.

By virtue of this, the hydride generation region of the present invention can extract and separate out effective analytical components. The gas flowmeter ensures that the carrier gas carrying the sample can stably enter the atmospheric pressure glow discharge generation area through the drying agent, and improves the stability of the atmospheric pressure glow discharge micro-plasma.

Preferably, in the hydride generation-atmospheric pressure glow discharge atomic spectrum device, the carrier gas carries the gas sample generated in the gas-liquid separator into the atmospheric pressure glow discharge generation region through the desiccant at a suitable carrier gas flow rate by the gas flow meter.

With the help of the method, the drying agent absorbs and removes liquid components in effective analysis components generated by hydride reaction, and the stability of the atmospheric pressure glow discharge micro-plasma is improved.

Preferably, in the hydride generation-atmospheric pressure glow discharge atomic spectrum device, the atmospheric pressure glow discharge generation region is connected in series with a current stabilizing resistor with a resistance value of approximately 2.5 to 12 k Ω, and the hollow electrode is directly contacted with the hollow counter electrode to trigger generation of the atmospheric pressure glow discharge microplasma.

By means of the resistance, the current-stabilizing resistor avoids the phenomenon that the arc is converted into the electric arc in the process of generating the atmospheric pressure glow discharge micro-plasma by the contact triggering of the hollow electrode and the hollow counter electrode, and meanwhile, the stability of the atmospheric pressure glow discharge micro-plasma is improved.

Preferably, in the hydride generation-atmospheric pressure glow discharge atomic spectrum device, the detection system is configured such that the optical fiber probe of the micro spectrometer is axially disposed along the atmospheric pressure glow discharge generation region, and the ultraviolet fused quartz planar window is disposed between the atmospheric pressure glow discharge generation region and the optical fiber probe.

According to the invention, the spectral signal acquisition is carried out along the axial direction of the atmospheric pressure glow discharge generation area, so that on one hand, the sensitivity of optical signal acquisition is improved, and meanwhile, the influence of optical signal fluctuation on the signal acquisition stability is avoided to a certain extent. The portable low-power excitation source device is used for carrying out high-sensitivity and high-selectivity analysis on elements.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a hydride generation-atmospheric glow discharge atomic spectroscopy device according to an embodiment of the present invention;

FIG. 2 is an atomic emission spectrum of Se element by a hydride generation-atmospheric glow discharge atomic spectrum device according to an embodiment of the present invention;

reference numerals:

1-reducing agent 2-sample solution 3-peristaltic pump 4-sample transmission silicone tube 5-T type quartz reaction block 6-gas flowmeter 7-gas-liquid separator 8-desiccant 9-hollow electrode 10-PTFE tube 11-stainless steel T type three-way valve 12-first high temperature resistant quartz tube 13-second high temperature resistant quartz tube 14-outer side high temperature resistant quartz tube 15-hollow counter electrode 16-ultraviolet fused quartz plane window 17-optical fiber probe 18-micro spectrometer 19-high voltage power supply 20-constant current resistance 21-copper wire 22-computer.

Detailed Description

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown and described, and which are to be considered illustrative of the invention only, and not restrictive.

As shown in fig. 1, an atomic spectrum device for hydride generation-atmospheric glow discharge provided by an embodiment of the present invention includes: a stainless steel T-shaped three-way valve 11 for fixing and connecting the elements of the device; the atmospheric glow discharge generation area arranged at one end of the stainless steel T-shaped three-way valve 11 mainly comprises a hollow electrode 9, a first high-temperature-resistant quartz tube 12, a second high-temperature-resistant quartz tube 13 and a hollow counter electrode 15; the core part of the hydride generating area mainly comprises a peristaltic pump 3, a T-shaped quartz reaction block 5, a gas flowmeter 6, a gas-liquid separator 7 and a drying agent 8, and carrier gas generated by the hydride generating area and a sample carried by the carrier gas are transmitted to the atmospheric pressure glow discharge generating area; the outer high-temperature-resistant quartz tube 14 is arranged at one end of the stainless steel T-shaped three-way valve 11, and cooling gas is input between the outer high-temperature-resistant quartz tube 14 and the first high-temperature-resistant quartz tube 12; a micro spectrometer 18 equipped with a fiber optic probe 17 is used to receive the optical radiation signal generated by the atmospheric glow discharge and operates in conjunction with a computer 22. Software that can be used is, for example, spectra suite.

In this embodiment, as shown in fig. 1, the hollow electrode 9 having an inner diameter and an outer diameter of 1.1 mm and 1.6 mm respectively in the atmospheric glow discharge generation region is embedded in the first high temperature resistant quartz tube 12 having an inner diameter and an outer diameter of 1.6 mm and 3.0 mm respectively, the outer wall of the hollow electrode 9 is tightly attached to the inner wall of the first high temperature resistant quartz tube 12, and the port of the hollow electrode 9 is kept to be limited within the port of the first high temperature resistant quartz tube 12 by 2-6 mm. The inner diameter and the outer diameter of the hollow counter electrode 15 are respectively 1.8 mm and 3.0 mm, the inner diameter of the hollow counter electrode is equal to or slightly larger than the inner diameter of the first high-temperature-resistant quartz tube 12, meanwhile, the outer diameter of the hollow counter electrode 15 is the same as the outer diameter of the first high-temperature-resistant quartz tube 12, the port of the hollow counter electrode 15 facing the hollow electrode 9 is kept to be tightly attached to the port of the first high-temperature-resistant quartz tube 12, and the fact that glow discharge generated in an atmospheric pressure glow discharge generation area is bound in the limited volume of the first high-temperature-resistant quartz tube 12 is guaranteed. The second high temperature resistant quartz tube 13 with the inner diameter and the outer diameter of 3.0 mm and 4.0 mm is arranged outside the first high temperature resistant quartz tube 12 and the hollow counter electrode 15 respectively, so that the inner wall of the second high temperature resistant quartz tube 13 is tightly attached to the outer wall of the first high temperature resistant quartz tube 12 and the outer wall of the hollow counter electrode 15 simultaneously, and the first high temperature resistant quartz tube 12 embedded with the hollow electrode 9 is ensured to be coaxially arranged with the hollow counter electrode 15. The first high temperature resistant quartz tube 12 embedded with the hollow electrode 9 is arranged at one end of the stainless steel T-shaped three-way valve 11 through a PTFE (polytetrafluoroethylene, for short) tube 10 with an inner diameter and an outer diameter of 3.0 mm and 6.0 mm, respectively, and the outer high temperature resistant quartz tube 14 is arranged at the other end of the stainless steel T-shaped three-way valve 11, and the hollow counter electrode 15 is kept to extend to the outer side of the port of the outer high temperature resistant quartz tube 14 by 3-6 mm. The PTFE material has the characteristics of corrosion resistance, high temperature resistance, non-adhesion, electrical insulation and the like, and is more suitable for the use requirement of the hydride generation-atmospheric pressure glow discharge atomic spectrum device provided by the embodiment.

In this embodiment, the hydride generation zone serves as a carrier gas/sample introduction port for the atmospheric pressure glow discharge generation zone. The rotation speed of the peristaltic pump 3 is set to be 0.4-1.0 mL/min, a reducing agent 1 with a certain concentration and a sample solution 2 (in this embodiment, an acid matrix sample solution) are introduced into a T-shaped quartz reaction block 5 through a sample transmission silicone tube 4 to react at the rotation speed, and a reaction product enters a gas-liquid separator 7. The gas-liquid separator 7 has four interfaces, namely an upper interface, a lower interface, a left interface and a right interface, wherein the left interface is a reaction product leading-in end, the upper interface is a carrier gas and gas product leading-out end, the lower interface is a carrier gas leading-in end, and the right interface is a reaction waste liquid leading-out end. The reaction solution and the reaction product enter a gas-liquid separator 7 from a T-shaped quartz reaction block 5, carrier gas with a certain flow rate is controlled by a gas flowmeter 6 to enter the gas-liquid separator 7 from a lower interface of the gas-liquid separator 7, the carrier gas with a certain flow rate carries the gas product to enter an atmospheric pressure glow discharge generation area after being dried by a drying agent 8, a medium foundation required by glow discharge is provided for the atmospheric pressure glow discharge generation area, and the gas product is excited.

Preferably, the carrier gas selected by the hydride generation area can be inert gas Ar or He gas, and the atmospheric pressure glow discharge generated by taking the He gas as a medium is columnar, so that the analyte can be effectively excited.

In the embodiment, a copper wire 21 wrapped with an insulating material at the outer layer is connected to the hollow electrode 9 and the hollow counter electrode 15 extending to the outside of the right port of the outer high-temperature resistant quartz tube 14, a current stabilizing resistor 20 with a resistance value of approximately 2.5-12 k Ω is connected between the two electrodes in series, and then the current stabilizing resistor is respectively connected to the positive electrode and the negative electrode of the high-voltage power supply 19, and the high-voltage power supply 19 outputs a certain voltage to provide a proper high voltage for the generation of atmospheric glow discharge in the atmospheric glow discharge generation area.

Preferably, the high voltage power supply 19 outputs a certain high voltage between the hollow electrode 9 and the hollow counter electrode 15, and the stable carrier gas flow rate is provided between the hollow electrode 9 and the hollow counter electrode 15 in the atmospheric pressure glow discharge generation region (>60 mL∙min^-1) When in use, the hollow electrode 9 is directly contacted with the hollow counter electrode 15 to trigger the generation of atmospheric pressure glow discharge microplasma. The current stabilizing resistor ensures that the discharge between the hollow electrode 9 and the hollow counter electrode 15 is transited into electric arc on one hand, and simultaneously prevents a circuit from generating short circuit when the hollow electrode 9 is contacted with the hollow counter electrode 15.

In this embodiment, the optical fiber probe 17 in the signal detection system is arranged and fixed on a three-dimensional platform with an adjustable direction of X, Y, Z and an adjustment precision of 2 μm, the optical fiber probe 17 and the atmospheric pressure glow discharge generation area are horizontally and coaxially arranged for signal acquisition, and an ultraviolet fused quartz plane window 16 is arranged between the hollow counter electrode 15 and the optical fiber probe 17 in the atmospheric pressure glow discharge generation area. The fiber-optic probe 17 is used as a signal coupling device in a signal detection system, and is detected and amplified by a charge-coupled detector of a micro spectrometer 18 (model may be Maya 2000), and then data is displayed and analyzed by a computer 22 (spectrasoite software may be adopted), so as to obtain target detection data.

In this embodiment, the working process of the hydride generation-atmospheric pressure glow discharge atomic spectrum device is as follows: the reducing agent 1 and the sample solution 2 (acid matrix sample solution in this embodiment) required for analysis are first introduced into the T-shaped quartz reaction block 5 through the sample transfer silicone tube 4 by the peristaltic pump 3 in the hydride generation region, and the reducing agent 1 and the sample solution 2 are reacted in the T-shaped quartz reaction block 5 and injected into the gas-liquid separator 7. The carrier gas passes through the gas flow meter 6 at a stable flow rate: (>50 mL∙min^-1) And the gas product generated by the carrying reaction is dried by a drying agent 8 and then enters an atmospheric pressure glow discharge generation area. The high-voltage power supply 19 outputs a certain high voltage to the hollow electrode 9And a hollow counter electrode 15, and the hollow electrode 9 is directly contacted with the hollow counter electrode 15 to generate stable atmospheric pressure glow discharge micro-plasma. The optical fiber probe 17 which is coaxial with the atmospheric pressure glow discharge generation area is used for detecting the optical radiation signal of the atmospheric pressure glow discharge generation area, and is coupled to the micro spectrometer 18 for detection and amplification, and then the computer 22 (which can adopt SpectraSuite software) is used for processing and recording the detection result.

In conclusion, the hydride generation-atmospheric pressure glow discharge atomic spectrum device structure provided by the embodiment is further simplified, and meanwhile, the integration level of the whole device is improved. The first high temperature resistant quartz tube 12 limits the effective volume of the atmospheric pressure glow discharge in the atmospheric pressure glow discharge generating area, improves the discharge energy density to a certain extent, and further improves the excitation intensity of elements.

Fig. 2 is an atomic emission spectrum of Se element by the hydride generation-atmospheric glow discharge atomic spectrum device according to one embodiment of the present invention. The reducing agent 1 and the solution containing Se element are subjected to the working process of the hydride generation-atmospheric pressure glow discharge atomic spectrum device, atomic characteristic emission lines generated by the excitation of an atmospheric pressure glow discharge generation area are collected through the optical fiber probe 17 of the micro spectrometer 18, and the characteristic emission line intensities of Se at the wavelengths of 196.1nm and 203.9nm are shown in figure 2. The emission intensity of the Se characteristic spectrum line is improved by 10 times after the first high-temperature resistant quartz tube 12 is added compared with the situation that the first high-temperature resistant quartz tube 12 is not added.

The invention introduces a cooling system to reduce the rapid loss of the hollow electrode 9 and the hollow counter electrode 15 under high discharge intensity. The signal acquisition form that the atmospheric pressure glow discharge generating area and the optical fiber probe 17 are horizontally and coaxially arranged is adopted, on one hand, the sensitivity of optical signal acquisition is improved, and simultaneously, the influence of optical signal fluctuation on the signal acquisition stability is avoided to a certain extent.

In summary, the hydride generation-atmospheric pressure glow discharge atomic spectrum device provided by the invention comprises a stainless steel T-shaped three-way valve, a hydride generation area, a high temperature resistant quartz tube with a matched size, an atmospheric pressure glow discharge generation area and a signal acquisition system. The stainless steel T-shaped three-way valve is used for fixing the atmospheric pressure glow discharge generation area and each part element of the cooling system. The hydride generating area and the atmospheric pressure glow discharge generating area work in a matching way, and the input of carrier gas provides a medium basis for the generation of the atmospheric pressure glow discharge. In the signal detection system, the optical fiber probe couples the optical radiation generated by the atmospheric pressure glow discharge generation area to the micro spectrometer to detect and amplify the signal. When the hydride generation-atmospheric pressure glow discharge atomic spectrum device works, glow discharge micro-plasma generated in an atmospheric pressure glow discharge generation area is bound in a high-temperature-resistant quartz tube with a matched size. Under high intensity discharge, the cooling system can cool the hollow electrode and the hollow counter electrode. In the signal detection system, an atmospheric glow discharge generation area and a micro spectrometer optical fiber probe are horizontally and coaxially arranged for signal acquisition, and an ultraviolet fused quartz plane window is arranged between the atmospheric glow discharge generation area and the optical fiber probe.

The present invention may be embodied in several forms without departing from the spirit of the essential characteristics thereof, and the present invention is therefore to be considered in all respects as illustrative and not restrictive. For example, in the above embodiment, the T-shaped three-way valve is made of stainless steel T-shaped three-way valve 11, but the material may be polytetrafluoroethylene, polyethylene, iron, copper, or the like; in the above embodiment, the T-shaped quartz reaction block 5 is used as the T-shaped reaction block, but the material may be corrosion-resistant material such as polytetrafluoroethylene and silica gel; in the above embodiment, the first high temperature resistant quartz tube 12, the second high temperature resistant quartz tube 13, and the outer high temperature resistant quartz tube 14 are used, but high temperature resistant materials such as alumina may be used instead of quartz; in the above embodiment, the copper wire 21 is used, but a material having a high electric conductivity, such as silver or iron, may be used as the wire; in the above embodiment, the drying agent 8 is used, but other filter membranes capable of filtering out liquid components and the like may be used; in the above embodiment, the PTFE tube 10 is used, but a material such as polypropylene, perfluoroethylene-propylene copolymer, etc. which is corrosion resistant may be used. In the above embodiment, the uv fused silica planar window is used, but instead of the uv fused silica lens, the calcium fluoride planar window and lens, the magnesium fluoride planar window and lens, etc. may be used.

Since the scope of the invention is defined by the claims rather than the specification, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.