Microplasma apparatus suitable for metallic element analysis in gas

Abstract

The invention relates to a microplasma apparatus suitable for metallic element analysis in gas. The apparatus comprises a high-voltage power supply, a buffer resistor, a hollow metal anode, and a liquid cathode, wherein the hollow metal anode is connected to a positive electrode of the high-voltage power supply through the buffer resistor, and the liquid cathode is connected to a negative electrode of the high-voltage power supply through a graphite electrode. The microplasma apparatus has such a structure that a discharging area is formed between the hollow metal anode and the liquid cathode, and the hollow metal anode is taken as a sampling pipe to enable to-be-detected gas to enter the discharging area and to be excited. The apparatus is simple in structure, small in size, simple to operate, and low in cost. Gas can be directly sampled without affecting stability of microplasma; the metallic element analysis is high in sensitivity; and a base is established for combination of the apparatus and other instruments.

Description

technical field [0001] The invention belongs to the field of atomic spectrum analysis, and relates to a micro-plasma device, more specifically, to a micro-plasma device suitable for analyzing metal elements in gas. Background technique [0002] Traditional metal element analysis methods include atomic absorption spectrometry, inductively coupled plasma emission spectrometry / mass spectrometry, etc. The detection instruments used in these methods are expensive, the equipment is large, the detection steps are cumbersome, and the detection cost is high. With the development of science and technology and the improvement of detection level, people began to study simple, rapid and low-cost rapid detection technology of metal elements. [0003] Micro-plasma is a general term for plasmas with a scale of millimeters or even lower. Micro-discharge plasmas can usually operate under atmospheric pressure conditions, usually do not require special gases for operation, and have the characte...

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Problems solved by technology

[0004] The sampling method of the liquid cathode glow discharge device is liquid sampling, that is, the liquid sample is introduced into the glass capillary by the peristaltic pump through the sampling tube and overflows. The sampling method is single, and only the liquid sample can be tested; and because the pH value of the cathode liquid It must be 1, and the requirements for sample pretreatment are harsh, which seriously restricts its application in the field of analysis; at the same time, the atomization efficiency of the elements in the solution to be measured is low in plasma evaporation, which reduces the sensitivity of the elements to be measured

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