Rapid detection method for expired gas through on-line enrichment gas chromatography

Abstract

The invention discloses a rapid detection method for expired gas through an on-line enrichment gas chromatography. The method mainly comprises the steps that: a collector is selected by using the expired gas to collect alveolar gas in the expired gas; VOCs (Volatile Organic Compounds) in the alveolar gas are adsorbed by a preconcentrator; the preconcentrator is heated to enable the VOCs enriched on an adsorbent to be desorbed; the preconcentrator is blown back by carrier gas to enable the VOCs subjected to the heat desorption to enter a chromatographic separation column along with the carrier gas for separation; and component gases of the VOCs after the separation enter a microplasma detector along with the carrier gas. After component gas molecules of the VOCs enter a discharge chamber of the microplasma detector, the component gas molecules are excited by the existing high-energy metastable-state particles, then are jumped back to ground states, and send characteristic optical signals; the characteristic optical signals sent by the jumping of the component molecules of the VOCs are focused and coupled to an optical fiber by a lens; the characteristic optical signals are transmitted by the optical fiber to a spectrograph for detection; a computer processes and stores data; and the rapid detection on the VOCs in the expired gas is realized. With the adoption of the method, components of the expired gas can be monitored in real time and on line.

Description

technical field [0001] The invention relates to a detection technology for trace volatile organic compounds in exhaled air of a human body, in particular to a method for rapidly detecting trace volatile organic compounds in exhaled air by using an online enrichment portable gas chromatography. Background technique [0002] In recent years, major diseases represented by cardiovascular and cerebrovascular diseases in my country have shown an obvious and rapid upward trend. The current "bottleneck" in the prevention and treatment of these major diseases is: insufficient understanding of early detection and early diagnosis of diseases, lack of effective measures for early diagnosis, early warning and monitoring, which increases the suffering of patients and families, affects the cure rate, and brings huge economic losses. The "National Medium- and Long-Term Science and Technology Development Program Outline" (2006-2020) proposes to move the center of disease prevention and cont...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the status quo of the existing rapid detection technology of VOCs in exhaled air, the purpose of the present invention is to provide a new method for detecting VOCs in exhaled air, so as to overcome the complex structure and volume of the existing device for implementing the VOCs detection method in exhaled air. Huge, expensive, complex operation, long analysis time, inability to achieve fast real-time online detection

Images