A liquid discharge micro-plasma excitation source device and plasma excitation method

A technology of micro-plasma and excitation source, applied in electrical excitation analysis, material excitation analysis, etc., can solve the problem of undetectable sensitivity of elements, and achieve the effects of improving sample introduction efficiency, shortening analysis time, and protecting power supply

Active Publication Date: 2018-06-15
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned micro-plasma excitation sources are often unable to detect or have poor sensitivity when measuring certain elements in the solution, such as zinc, cadmium, etc.

Method used

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  • A liquid discharge micro-plasma excitation source device and plasma excitation method
  • A liquid discharge micro-plasma excitation source device and plasma excitation method
  • A liquid discharge micro-plasma excitation source device and plasma excitation method

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Embodiment 1

[0030] combine figure 1 , the present invention provides a liquid discharge micro-plasma excitation source device, including a circuit part and a battery discharge part, the circuit part includes a DC power supply 15 and a current limiting resistor 14 connected in series, one end of the whole circuit part is an anode, and the other end is an anode Cathode; the voltage of the DC power supply is 900V, and the current limiting resistance is 10kΩ; the battery discharge part includes the anode pool 3 and the cathode pool 9, and the cathode pool is connected to the lower part of the anode pool. The anode pool is a cylinder with an inner diameter of 7 mm and a height of 20 mm, and the cathode pool is a cuboid with a length of 12 mm, a width of 12 mm, and a height of 20 mm.

[0031] The lower part of the cathode pool and the anode pool are connected by a conduit 5 with a length of 20 mm and a diameter of 5 mm inclined to the cathode pool. The bottom of the cathode pool is provided wit...

Embodiment 2

[0040] combine figure 1, the present invention provides a liquid discharge micro-plasma excitation source device, including a circuit part and a battery discharge part, the circuit part includes a DC power supply 15 and a current limiting resistor 14 connected in series, one end of the whole circuit part is an anode, and the other end is an anode Cathode; the voltage of the DC power supply is 1000V, and the current limiting resistance is 8kΩ; the battery discharge part includes the anode pool 3 and the cathode pool 9, and the cathode pool is connected to the lower part of the anode pool. The anode pool is a cylinder with an inner diameter of 10 mm and a height of 50 mm, and the cathode pool is a cuboid with a length of 30 mm, a width of 30 mm, and a height of 50 mm.

[0041] The cathode pool and the lower part of the anode pool are connected by a conduit 5 with a length of 30 mm and a diameter of 10 mm inclined to the cathode pool. The bottom of the cathode pool is provided wi...

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Abstract

The present invention provides a liquid discharge micro-plasma excitation source apparatus, which comprises a discharge pool and a circuit portion, wherein the discharge pool comprises an anode pool and a cathode pool, the anode pool and the cathode pool are connected through an inclined conduct pipe, the anode pool is provided with a gas discharge port, the side wall of the cathode pool is provided with a protection gas inlet, a gas discharge port, a sample inlet and volume scales, the bottom portion is provided with a wastewater outlet, and the circuit portion comprises a direct current power supply and a current limiting resistor. The present invention further provides a plasma excitation method, which comprises that a solution containing a sample to be detected is introduced into a discharge pool, the discharge is achieved by reducing the distance between the cathode and the liquid level to produce the plasma, the element to be detected in the solution is introduced into the plasma zone and is excited, and the produced characteristic emission spectral line is analyzed so as to carry out qualitative and quantitative analysis on the element to be detected. According to the present invention, during the running, the plasma is adopted as the cathode and the electrochemical reaction is conducted on the plasma-solution surface to generate the gaseous compound of the element to be detected, and the gaseous compound enters the plasma zone and is excited so as to improve the plasma excitation efficiency and improve the sensitivity.

Description

technical field [0001] The invention relates to a liquid discharge micro-plasma excitation source device and a plasma excitation method, belonging to the field of atomic emission spectrum excitation sources. Background technique [0002] Atomic spectroscopy is a very commonly used analytical technique in the fields of geology, environment and other sciences, and plays an important role in the development of related scientific fields. Most of the current routine atomic emission spectrometry analysis is still carried out in the laboratory, which is difficult to meet the needs of on-site and timely analysis. The key point limiting the miniaturization of atomic emission spectroscopy is the miniaturization of the excitation source. At present, the excitation sources commonly used in atomic emission spectroscopy mainly include inductively coupled plasma (ICP), DC arc, low-voltage AC arc, and high-voltage capacitive spark. These excitation sources have the disadvantages of large ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/67G01N21/69
CPCG01N21/69G01N21/67
Inventor 朱振利刘星郑洪涛胡圣虹
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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