Home LMS THMG157 – Chemical Agent Monitors – Part 2

THMG157 – Chemical Agent Monitors – Part 2

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In this episode we review a few of the technologies that are out there. Some are out of service, some in and some coming into vogue. We discuss the good, bad and ugly of each one. 2 part series!

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      1. Color-Change Chemistry

        1. We covered this in the podcast about colometrics. We just added this in because it can be used for chemical warfare monitoring.

 

  • Infrared Absorption Spectroscopy

  • What are they?
  • How do they work?

 

        1. What are there capabilities?
          1. GA 1.2ppb 2 seconds     0.3 ppb 1 min
          2. GB 0.7ppb 2 seconds     0.2 ppb 1min
          3. GD 1.1ppb 2 seconds   0.3 ppb 1min
          4. GF 0.9ppb 2 seconds   0.2 ppb 1min
          5. HD 186 3 ppb 2 seconds    0.8 ppb 1 min
          6. Lewisite 4 ppb 2 seconds        1.0 ppb 1min
          7. VX 22 ppb 2 seconds 16         4 ppb 1 min
          8. High sensitivity, fast detection
          9. Non-destructive
        2. What are there limiting factors?
          1. Some system can be affected by humidity in the air.
          2. Concentrations of CWA at and below IDLH are difficult at best.

 

  • FTIR
  • What are they?
  • How do they work?

 

        1. What are there capabilities?
        2. What are there limiting factors?
          1. Moisture in the air. You can actually breathe on it and see a jump in the water range
          2. Can’t do continuous monitoring,
          3. Can’t detect vapors. At least not in amounts low enough to make it a go-to meter

 

  • High-pressure mass spec.
  • What are they?
  • How do they work?

 

        1. What are there capabilities?
          1. Capable of seeing very fine, small, trace
        2. What are there limiting factors?
          1. Overloading the machine

 

  • GCMS
  • What are they?
  • How do they work?

 

        1. What are there capabilities?
        2. What are there limiting factors?
          1. Very complicated to use
          2. Some of the new ones have the ability to piece together some things but most rely on human interpretation.

 

  • Raman Spectroscopy
  • What are they?
  • How do they work?

 

      1. What are there capabilities?
        1. Seeing into the glass container
          1. Limits exposure and contamination
        2. Works great with things in a water
        3. Non-destructive
      2. What are there limiting factors?
        1. Like any meter that compares a sample spectrum to a known, there are a lot of things that can throw off that comparison
          1. Is that it has to be in the library to read it.
          2. Multiple chemicals and contamination can throw off the spectrum
        2. Lots of things seem to florence and not able to be seen
        3. Not a passive air monitoring system.

 

The Hazmat Guys

Author: The Hazmat Guys


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