How does a Gas Chromatograph-Mass Spectrometer detect quantities?

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Discussion Overview

The discussion revolves around the detection and quantification of molecules using gas chromatography-mass spectrometry (GC-MS). Participants explore the mechanisms by which the device detects specific fragments and the methods used to quantify them, focusing on theoretical applications and seeking clarification on the underlying principles.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant expresses confusion about how a gas chromatography-mass spectrometer detects the quantity of specific fragments, noting the role of the mass analyzer in identifying mass/charge ratios.
  • Another participant suggests looking for resources related to the operation of GC-MS instruments to gain a better understanding.
  • A third participant introduces the term “TOTAL ION CHROMATOGRAM” as a relevant search term for further exploration.
  • There is a mention that measuring current and counting electrons are fundamentally similar processes, which may relate to detection methods.
  • A follow-up question is posed regarding how the mass spectrometer separates various fragments after ionization, indicating a need for clarification on the separation process.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the specific mechanisms of detection and quantification within GC-MS, and multiple viewpoints and questions remain unresolved.

Contextual Notes

Participants have not provided detailed assumptions or definitions regarding the detection methods, and there are unresolved questions about the separation of fragments post-ionization.

BBChem42
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Thread moved from the technical forums to the schoolwork forums
So I am working on theoretical project that challenges my group to detect and quantify a certain molecule in a sample. For the detection and quantification we have chosen to work with a gas chromatography-mass spectroscopy. However I am finding difficulties in how this device is able to detect amounts of certain fragments. I am aware that there is a mass analyser that can detect fragments with a certain mass/charge ratio but what detects the amount of every fragment? Looking for a good source to read into this detection method or just straight answers here. Thanks
 
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Welcome to PF.

Can you give us some links to the reading you've been doing so far about how those types of instruments work? Thanks.
 
“TOTAL ION CHROMATOGRAM”

Good search term
 
Measuring current and counting electrons are basically the same thing.
 
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BBChem42 said:
So I am working on theoretical project that challenges my group to detect and quantify a certain molecule in a sample. For the detection and quantification we have chosen to work with a gas chromatography-mass spectroscopy. However I am finding difficulties in how this device is able to detect amounts of certain fragments. I am aware that there is a mass analyser that can detect fragments with a certain mass/charge ratio but what detects the amount of every fragment? Looking for a good source to read into this detection method or just straight answers here. Thanks
How does your mass spectrometer separate the various fragments after ionization?
 

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