Making CO2 Gas Concentrations: 50ppm, 100ppm, 1000ppm

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SUMMARY

This discussion focuses on generating specific concentrations of CO2 gas (50ppm, 100ppm, 1000ppm) from a gas cylinder containing 99.999% CO2. The participants emphasize the need for a suitable diluent, with suggestions including argon as a potential mixing gas. The conversation highlights the lack of readily available procedures for achieving low concentrations of CO2, indicating a gap in accessible resources for practical applications in various fields.

PREREQUISITES
  • Understanding of gas dilution techniques
  • Familiarity with gas mixing equipment
  • Knowledge of gas concentration measurement methods
  • Basic principles of gas laws and behavior
NEXT STEPS
  • Research gas dilution methods using argon or nitrogen
  • Learn about gas concentration measurement techniques such as gas chromatography
  • Explore the use of mass flow controllers for precise gas mixing
  • Investigate standard operating procedures for generating low gas concentrations in laboratory settings
USEFUL FOR

Researchers, laboratory technicians, and professionals in fields requiring precise gas concentration control, such as environmental science, chemistry, and industrial applications.

strokebow
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Hi,

I have a gas cylinder 99.999% CO2.

I want to apply the CO2 to my sample at different concentration. e.g.) 50ppm, 100ppm, 1000ppm.

How do I make these concentrations of CO2 from my gas cylinder? Any practical advice would be truly appreciated.

cheers
 
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Mixed with what? Those first two concentrations are lower than the concentration of CO2 in air...
 
Hi

thanks for replying.

I don't know what to mix with.

For example, if I wanted to make up a solution of a liquid or powder to low concentration I would just dissolve in deionized water of the correct amounts to give the desired conc.

But for gases I am not sure.

What gas to mix with? I don't know?

To get 10ppm of CO2 how would this be done? Would you mix CO2 with argon? How can you control the amount you release?

I can't find a procedure for this on the internet altough I would expect this would be common practise in some fields?

Any ideas?
 

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