Micro-plasma excitation source and excitation method based on ultrasonic atomization sample introduction

Abstract

The invention provides a micro-plasma excitation source based on ultrasonic atomization sample introduction, and relates to the field of emission spectrum element analysis excitation light sources. The micro-plasma excitation source comprises an AC power supply, two metal electrodes and an ultrasonic atomization sheet; the AC power supply is electrically connected with one end of each metal electrode; the discharge ends of the metal electrodes are positioned in the same plane; the ultrasonic atomization sheet is horizontally arranged above the discharge ends of the metal electrodes and is used for converting a solution to be detected into aerosol and downwards spraying the aerosol to the discharge ends of the metal electrodes and space between the metal electrodes; and the AC power supply, the metal electrodes and the aerosol are matched to form a V-shaped micro plasma below the metal electrodes. The invention further provides an excitation method adopting the micro-plasma excitation source based on ultrasonic atomization sample introduction, and the detection precision of metal elements can be effectively improved.

Description

technical field [0001] The invention relates to the field of excitation light sources for elemental analysis of emission spectra, in particular to a micro-plasma excitation source and an excitation method based on ultrasonic atomization sample introduction. Background technique [0002] Traditional excitation sources include inductively coupled plasma excitation sources, but due to their high power consumption, high gas consumption, and difficulty in maintenance, they are limited to laboratories and cannot meet in-situ on-site analysis and detection. In order to meet the needs of in-situ analysis of elements, a variety of micro-plasma excitation sources have been developed successively, such as invention patent authorization announcement numbers CN 101330794 B, CN102445445 B, CN 102866224 B, CN 103760138 B and other excitation light sources are DBD; invention patent authorization The excitation light source of announcement number CN103776818B, CN 104254188 B, application pub...

AI Technical Summary

Problems solved by technology

The innovation and technology development of excitation light sources are the key to the development of miniaturized / miniaturized emission spectrometers. Although the micro-plasma excitation sources reported so far have small size and can greatly reduce power consumption and gas consumption, for plasma The maintenance and implementation of sample introduction still cannot avoid the dependence on compressed gas or peristaltic pump, which is not conducive to the overall miniaturization of analytical instruments, so it is necessary to develop a simpler micro-plasma excitation source

[0003]Ultrasonic nebulization is an alternative to traditional pneumatic nebulization. It is applied in the technical field of on-site chemical component detection and analysis, such as the invention patent authorization announcement number CN 101788487 A, which uses ultrasonic atomization to assist in the detection of electric spark breakdown spectroscopy, but the ultrasonic atomization device is large in size and depends on the sample cell and gas guidance. This is not conducive to the overall miniaturization of analytical instruments

Although on-site analysis of elements is also possible, because the excitation source is an instantaneous breakdown discharge, it is difficult to provide long-term continuous and stable signals, and only qualitative or semi-quantitative analysis can be done, which cannot meet the needs of high-precision quantitative analysis

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