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A heating and condensing device to improve the 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: 2021-11-02
CHINA UNIV OF GEOSCIENCES (WUHAN)
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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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  • A heating and condensing device to improve the sensitivity of icp-ms instrument
  • A heating and condensing device to improve the sensitivity of icp-ms instrument
  • A heating and condensing device to improve the sensitivity of icp-ms instrument

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Embodiment 1

[0037] Sensitivity is an important index to measure the detection performance of ICP-MS. Higher signal sensitivity at the same element concentration means that the instrumental analysis method has stronger detection ability for the target element. In the heating and condensing device, the heating temperature directly determines the degree of evaporation of the water solvent in the sample aerosol particles in the dual-channel spray chamber 1, thereby affecting the signal enhancement change of the target element. figure 2 As shown, taking La element as an example, under different heating temperatures, the condensation temperature of the condensation part 6 is all selected to be 4°C. As the temperature increases from 25°C to 180°C, 1ngml -1 La signal strength increased from 600000cps to 4200000cps. This phenomenon proves that as the temperature increases, the degree of evaporation of the sample aerosol particles in the dual-channel spray chamber 1 continues to increase, the nu...

Embodiment 2

[0039] image 3 As shown, the heating temperature of the thermostat 5 is selected to be 180°C, and the condensation temperature of the condensation part 6 is selected to be 4°C, which has an obvious signal enhancement effect on most elements, and its signal enhancement factor is roughly 5-6 times, while for high The signal enhancement factor of ionization energy elements (such as Be, Zn, As, Cd, 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. In the heating part, an infrared lamp tube with the same length as a double-channel atomization chamber is selected as a heating source, and a "straight" quartz tube is used to connect the heating atomization chamber and the condensing mist The chambers are connected to form a heating and condensing device. Infrared radiation heating can further reduce the droplet size generated by atomization, so that part of the solvent (water) becomes water vapor, and then condenses it through the condensation fog chamber to prevent most of the water vapor from entering the plasma (ICP). Causes plasma energy consumption, and even leads to the problem of ICP flameout. Through the combination of heating and condensation, the sensitivity of the ICP-MS instrument is greatly improved. For the 47 commonly determined elements, the signal enhancement factor of most elements is increased by 5-6 times, and the increase rate of some elements with high ionization energy can reach 7. -8 times.

Description

technical field [0001] The invention relates to the field of instrument analysis, in particular to a heating and condensation device for improving the sensitivity of an ICP-MS instrument. Background technique [0002] Inductively coupled plasma mass spectrometry (ICP-MS), as an analytical instrument with high sensitivity, low detection limit, wide range of detected elements, simple spectral lines and high efficiency, plays an extremely important role in the field of earth science. With the increasing demand for the detection of geological samples with trace element content, people's desire to pursue higher performance detection instruments is also becoming stronger. For this reason, it is particularly important to further improve the detection performance of ICP-MS to meet the detection requirements for trace elements. [0003] In the composition of ICP-MS instruments, the sampling system is one of the important components that affect the analytical performance of ICP-MS, a...

Claims

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Application Information

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Patent Type & Authority Patents(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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