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Gas replacement device

A gas replacement and air technology, applied in the field of mass spectrometry measurement, can solve the problem of high detection limit of the measurement system, achieve the effect of improving sensitivity, ensuring the effect of gas replacement, and avoiding disturbance

Pending Publication Date: 2018-12-21
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low injection flow rate, the detection limit of the measurement system is high

Method used

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Examples

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Effect test

Embodiment 1

[0029] A gas replacement device, the device includes a coaxial first pipeline 1 and a second pipeline 4, the material of the first pipeline 1 and the second pipeline 4 is PVC; the two ends of the first pipeline 1 are respectively provided with argon The gas inlet 2 and the argon gas outlet 3; the first pipeline 1 and the second pipeline 4 are in sealing connection.

[0030] The second pipeline 4 is located inside the first pipeline 1, and its outer diameter is smaller than the inner diameter of the first pipeline 1; the tube wall of the second pipeline 4 is provided with uniformly distributed pores, and the outside of the tube wall is wrapped with a nuclear pore membrane, and the nuclear pores The membrane has a pore size of 2×10 6 piece / cm 3 , the aperture is 70nm; one end of the second pipeline 4 is the sample inlet 5 of the air aerosol, the other end is the sample outlet 6 of the air aerosol and the sample outlet 6 of the air aerosol is connected with the sampling system o...

Embodiment 2

[0034] Different from Example 1, the outer diameter of the first pipeline is 50mm, and the inner diameter is 44mm; the outer diameter of the second pipeline is 14mm, and the inner diameter is 10mm; the pore diameter of the nuclear pore membrane is 2.5×10 6 piece / cm 3 , the pore size is 80nm.

[0035] The material of the first pipe and the second pipe is stainless steel.

[0036] The flow rate of the air aerosol is 1.2 L / min, and the flow rate of argon gas is 12 L / min.

Embodiment 3

[0038] Different from Example 1, the outer diameter of the first pipe is 30mm and the inner diameter is 26mm. The outer diameter of the second pipeline is 10mm, and the inner diameter is 8mm;

[0039] The pore size of the nuclear pore membrane is 1.2×10 6 piece / cm 3 , the pore size is 60nm.

[0040] The material of the first pipe and the second pipe is plexiglass.

[0041] The flow rate of the air aerosol is 1 L / min, and the argon flow rate is 9 L / min of the air aerosol flow rate.

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Abstract

The disclosure belongs to the technical field of mass spectrometry, and in particular to a gas replacement device based on a nuclear track membrane. The device comprises a first pipe and a second pipewhich are coaxial, wherein both ends of the first pipe are respectively provided with an argon inlet and an argon outlet; the second pipe is located inside the first pipe, both ends of the second pipe protrude from the first pipe, and the outer diameter of the second pipe is smaller than the inner diameter of the first pipe; the pipe wall of the second pipe is provided with uniformly distributedhole channels, and the nuclear track membrane is wrapped on the outer wall of the pipe wall; one end of the second pipe is a sample inlet of air aerosol, the other end is a sample outlet of the air aerosol, and the sample outlet of the air aerosol is connected to a sample inlet system of ICP-MS; the position of the sample inlet of the air aerosol corresponds to that of the argon outlet, and the position of the sample outlet of the air aerosol corresponds to that of the argon outlet, thereby realizing countercurrent contact between the air aerosol and argon to ensure the effect of gas replacement. The device has simple structure, convenient operation and a replacement rate of over 99.9%.

Description

technical field [0001] The disclosure belongs to the technical field of mass spectrometry, and in particular relates to a gas replacement device based on a nuclear pore membrane. Background technique [0002] ICP-MS can be used to measure the content of heavy metal elements in air aerosol, and its working gas is argon. During the measurement process, if the nitrogen and oxygen elements in the air enter the ICP-MS, they will be ionized by the plasma, and the ionization of nitrogen and oxygen will reduce the ionization effect of the metal to be measured, thus causing the sensitivity of the metal ion to be measured reduce. In addition, if the content of nitrogen and oxygen entering the ICP-MS increases to a certain extent, it will directly cause the instrument to shut down, so it is necessary to strictly control the content of air entering the ICP-MS. The traditional method is realized by controlling the flow rate of the sample, using a flow control device to control the flow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 骆志平庞洪超郑国文汪传高
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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