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End gas sampling apparatus for detecting volatile organic compounds in expired air

A volatile organic compound and gas sampling technology, applied in measurement devices, sampling devices, instruments, etc., can solve the problems of sample preservation, transportation loss or deterioration, complex composition and low content of gas at the end of exhalation, and achieve suitable inner diameter and length. , the effect of small dead volume and simple operation

Inactive Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] Traditional offline detection must go through multiple steps such as sample collection, pretreatment and separation detection. The composition of the exhaled gas is very complex and the content is very low. The sample is easily lost or deteriorated during storage and transportation.

Method used

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  • End gas sampling apparatus for detecting volatile organic compounds in expired air
  • End gas sampling apparatus for detecting volatile organic compounds in expired air

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Embodiment Construction

[0025] Such as figure 1 As shown: 1 is the blowing pipe, that is, the blowing port of the subject; 2 is the carrier gas inlet; 3 is the three-way valve; 4 is the sealing valve A; 5 is the sealing valve B; 6 is the sampling bottle; 7 is the mass spectrometry inlet sample port.

[0026] Before the subject blows air, the valves at both ends of the sampling bottle are fully opened, and the carrier gas enters from the inlet 2 at a certain flow rate. After purging for 2-3 minutes, the background air in the sampling bottle is completely blown away, and the background image is taken; After taking a deep breath, the subject blows into the clean blowing tube 1. When he feels that the exhalation is over, the initial and middle part of the exhaled gas has been blown out of the sampling bottle 6, and the sealing valve A4 and sealing valve B5 at both ends are immediately closed. At this time, the terminal exhaled gas is collected in the sampling bottle 6; the carrier gas carries the collec...

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Abstract

The invention discloses an end air sampling apparatus for detecting volatile organic compounds in expired air. The main body of the apparatus is a sample bottle with the volume of 20-100mL. Two ends of the sampling bottle are provided with a gas inlet and a gas outlet respectively, and are respectively connected with a valve; and the middle of the sampling bottle is provided with a small hole as a mass spectrum sample introduction port. When the apparatus is used to sample, the valves at two ends of the apparatus are opened, a tester blows air to a detachable air blow tube at one end of the sampling bottle, the valves at two ends are immediately closed after the breath is completed, that is, initial and intermediate stage air flows out, and end air is corresponding collected by the 20-100mL sampling bottle. The apparatus avoids interference of initial and intermediate air to measurement, is in favor of detecting end air, integrates sampling and sample introduction, and allows a collected sample to be carried by a carrier gas and to be analyzed through mass spectrometry in real time, so the apparatus is very suitable for detecting the volatile organic compounds in end expired air.

Description

technical field [0001] The invention belongs to the collection of terminal gas in exhaled air, in particular to a sampling device for measuring by mass spectrometry chemical ionization. Background technique [0002] Some products of human metabolism can be transported by the blood to the lungs, enter the alveoli through gas exchange, and appear in the exhaled air. As a method of understanding the physiological metabolic process of the human body and monitoring the disease status of the human body, exhaled breath detection has received more and more attention. Compared with conventional blood testing methods, the biggest advantage of exhaled breath testing is that it has no damage to the human body, and the operation process is convenient and quick. [0003] A reliable sampling method is an important guarantee for successful analysis. The concentration of human exhaled gas is generally at the ppb level, which is very low. Therefore, the key to exhaled breath collection is ...

Claims

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Application Information

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IPC IPC(8): G01N1/22G01N27/62
Inventor 李海洋王艳侯可勇陈平彭丽英蒋吉春刘巍蒋丹丹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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