Evolved Gas Analysis Device with Dual Carrier Gas Segmentation
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Solution Overview
Problem
The use of reactive gases as carrier gases in evolved gas analysis (EGA) significantly reduces the sensitivity of mass spectrometers to the second gas phase component, making it difficult to obtain accurate analysis.
Innovation Solution
An analysis device that incorporates a heating device, a first carrier gas introduction system using reactive gases, a capillary tube, a mass spectrometer, and a second carrier gas introduction system using inert gases like helium, hydrogen, or nitrogen to dilute the reactive gas, thereby improving the ionization efficiency and sensitivity of the mass spectrometer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a reactive gas is used as carrier gas in evolved gas analysis, then the ability to obtain reaction product information is improved, but the sensitivity of the mass spectrometer to the second gas phase component decreases by a factor of several dozen to several hundred
Solution Approach 1:
The carrier gas system is segmented into two separate introduction paths: a first carrier gas introduction device that introduces reactive gas to enable chemical reactions, and a second carrier gas introduction device that introduces inert gas (helium, hydrogen, or nitrogen) to transport reaction products to the mass spectrometer. This segmentation allows the reactive gas to fulfill its chemical function while the inert gas maintains optimal sensitivity for detection.
Solution Approach 2:
The second carrier gas (inert gas) acts as an intermediary between the reaction zone and the mass spectrometer. It transports the second gas phase component (reaction product) from the heating device through the connecting conduit and capillary tube to the mass spectrometer without interfering with the ionization process, thereby maintaining high sensitivity while enabling the use of reactive first carrier gas for product formation.
2Adaptability or versatility
If a reactive gas is used as carrier gas, then chemical reaction capability is improved, but ionization efficiency in the mass spectrometer deteriorates
Solution Approach 1:
The gas flow is segmented into reactive component (first carrier gas) and inert component (second carrier gas). The reactive gas provides chemical versatility for generating diverse reaction products, while the inert second carrier gas dominates the gas composition entering the mass spectrometer, ensuring efficient ionization and detection.
Solution Approach 2:
An inert atmosphere is created in the connecting conduit and capillary tube by introducing the second carrier gas (helium, hydrogen, or nitrogen). This inert environment protects the second gas phase component from unwanted side reactions during transport and ensures optimal conditions for ionization in the mass spectrometer, thereby maintaining high ionization efficiency while allowing reactive gas to be used in the heating zone.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves a substantial increase in sensitivity to the second gas phase component, allowing for more accurate analysis by diluting the reactive carrier gas with inert gases, resulting in improved signal-to-noise ratios and enhanced detection of reaction products.
Implementation Method 1
a heating device configured to produce a first gas phase component by heating a sample including organic matter
Implementation Method 2
a first carrier gas consisting of gas that is directly, or via a catalyst, reactive with the first gas phase component
Implementation Method 3
the second gas phase component is introduced into the mass spectrometer and analyzed
Data Source
AI summary
Provided is an analysis device capable of obtaining sufficient sensitivity to a gas phase component, which is the analysis target, by a mass spectrometer even when a reactive gas is used as a carrier gas in evolved gas analysis. An analysis device 1 includes a heating device 3, a first carrier gas introduction device 4, a connecting conduit 5, a capillary tube 6, an oven 2, a mass spectrometer 7, and a second carrier gas introduction device 8. The second carrier gas introduction device 8 is configured to introduce helium, hydrogen and/or nitrogen into the connecting conduit 5.