Collecting C02 Samples at depth.

Please register or login

Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

Benefits of registering include

  • Ability to post and comment on topics and discussions.
  • A Free photo gallery to share your dive photos with the world.
  • You can make this box go away

Joining is quick and easy. Log in or Register now!

Zebra 1

Contributor
Messages
108
Reaction score
18
Location
Houston, Texas
# of dives
I just don't log dives
Is there any standard or program in place for collecting air samples at depth for later analyzation? I would like to know what the CO2 levels are and maybe determine if I am a "CO2 Retainer".
 
  • Like
Reactions: OTF
Maybe manually fill your DSMB with the oral inflator at your target depth?
 
I was thinking maybe some type of balloon and collecting samples under different conditions, heavy workload, deep, cold, etc.
 
You need a chamber, co2 retention is measured in blood gases not via your exhalation. Unless you want to dive with an IV in your arm.
 
Interesting, I just assumed that the exhaled gas should have high C02 levels when blood levels are high. I thought that reduced respiration rate is what leads to high blood C02.
 
Interesting, I just assumed that the exhaled gas should have high C02 levels when blood levels are high. I thought that reduced respiration rate is what leads to high blood C02.

Hypercapnia and CO2 retention is defined in as the ppCO2 in arterial blood. There is some relationship with end tidal CO2, but its going to be highly dependent on workload. Without a standard workload, the end tidal Co2 isnt relevant to anything.
You can see the relationship here in Figure 1
Hypercapnia in diving: a review of CO₂ retention in submersed exercise at depth. (duke.edu)

Only 1 measurement isnt clinically relevant anyway.
 
I was thinking maybe some type of balloon and collecting samples under different conditions, heavy workload, deep, cold, etc.

balloons are porous so not ideal.
But as rack said, there’s not really a point to this exercise because CO2 in your blood is what you’re after. Expired CO2 won’t be the same or directly correlate. Also, how would you get it measured?
 
https://www.shearwater.com/products/peregrine/

Back
Top Bottom