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Heating and condensing device for improving sensitivity of ICP-MS instrument

A technology of ICP-MS and condensing device, which is applied in the field of instrument analysis, can solve problems such as the influence of plasma excitation performance, the influence of analysis signal strength value, and the reduction of ionization efficiency, so as to prolong the pre-evaporation time, avoid flameout phenomenon, and increase the surface area. The effect of reflectivity

Active Publication Date: 2021-03-26
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, because a large amount of solvent (water) will enter the plasma with the sample in the pneumatic atomization system, the desolvation process of the sample aerosol in the ICP will occupy most of the energy of the plasma, which will affect the excitation performance of the plasma.
The atomization of the target analyte, the ionization efficiency is reduced, which seriously affects the analytical signal intensity value

Method used

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  • Heating and condensing device for improving sensitivity of ICP-MS instrument
  • Heating and condensing device for improving sensitivity of ICP-MS instrument
  • Heating and condensing device for improving sensitivity of ICP-MS instrument

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Effect test

Embodiment 1

[0037] Sensitivity is an important indicator for measuring ICP-MS detection performance. Higher signal sensitivity at the same element concentration means that the instrument analysis method has stronger detection capabilities for the target elements. In the heating condensed device, the heating temperature directly determines the degree of evaporation of the water solvent in the sample aerosol particles in the dual channel atomization chamber 1, which in turn affects the signal enhancement of the target element. figure 2 As shown in the LA element as an example, at different heating temperatures, the condensation temperature of the condensed portion 6 is selected from 4 ° C. As the temperature increases from 25 ° C to 180 ° C, 1 ngml -1 The signal strength of LA is raised from 600000 cps to 4200000 cps. This phenomenon proves that as the temperature increases, the degree of evaporation of the sample gas sol particles in the dual-channel atomization chamber 1 continues to increas...

Embodiment 2

[0039] image 3 As shown, the heating temperature of the thermostat 5 selects 180 ° C, the condensation temperature of the condensed portion 6 selects 4 ° C, which has a significant signal enhancement effect on most elements, and the signal enhancement factor is approximately 5-6 times, and the higher The signal enhancement factor of ionization energy (such as BE, Zn, AS, CD, and TE) can reach 7-8 times.

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Abstract

The invention discloses a heating and condensing device for improving the sensitivity of an ICP-MS instrument. The heating and condensing device is characterized in that a heating part selects an infrared lamp tube with the same length as a double-channel atomizing chamber as a heating source, and the heating atomizing chamber is connected with a condensing fog chamber by using a straight quartz tube to form the heating and condensing device. Infrared radiation heating is adopted, the size of fog drops generated by atomization can be further reduced, part of solvent (water) becomes water vapor, then the water vapor is condensed through the condensation fog chamber, and the problems that most of the water vapor enters plasma (ICP), plasma energy consumption is caused, and even ICP flameoutis caused are solved. Through the combination of heating and condensation, the sensitivity of an ICPMS instrument is greatly improved, for 47 common determination elements, the signal enhancement factor of most elements is improved to 5-6 times, and the improvement amplitude of some high ionization energy elements can reach 7-8 times.

Description

Technical field [0001] The present invention relates to the field of instrument analysis, and more particularly to a heating condensation device that enhances ICP-MS instrument sensitivity. Background technique [0002] Inductive coupling plasma mass spectrometry (ICP-MS) is used as a high sensitivity, low test, high detection element range, simple line, high efficiency analysis instrument, play an extremely important role in the field of earth science. As the detection requirements of geological samples for trace elements are getting higher and higher, people pursue higher performance testing instruments are also more intense. To this end, further enhance the detection performance of ICP-MS, which is especially important to meet the detection requirements of trace content elements. [0003] In the ICP-MS instrument composition, the injection system belongs to one of the important components of ICP-MS analysis performance, and its research has always been highly valued in the ana...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J49/04H01J49/10H01J49/26G01N27/626
CPCG01N27/62H01J49/0404H01J49/105H01J49/26
Inventor 赵赫余嘉昕陈力飞何焘潘勇胡兆初
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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