In the first blog (part I) of this series I introduced what is relative humidity (RH) and why do we care about it when sampling/analyzing whole canister samples for volatile organic compounds (VOCs). In my last blog (part II) I showed you how to calculate the theoretical relative humidity (% RH) in a canister.
In this blog I will show you how we generate a humidified blank. Recall from example 1 in my previous blog (part II) we learned that 200 µL of H2O injected into an evacuated 6 L canister @ 22.5 °C and then filled to a final pressure of 30 psig would result in a theoretical RH of 55.7%. In the following VIDEO, I am going to show you just how this would be carried out:
