# Does nitrogen deaeration need to be performed in a fume hood?

I have a couple electrochemical cells I will need to sparge (deaerate) with nitrogen prior to and possibly during my experiment (the solution is .1 M NaOH). Does this need to be done in a fume hood?

From what I've read, it seems that $\ce{N2}$ gas isn't a huge danger, but if you're in a confined space it can cause a severe lack of oxygen. If that is the case, would a normal-sized classroom count as a confined space? Also, from what I understand about deaeration, the nitrogen bubbles escape the solution with impurities, but also with oxygen, so maybe in my case the lack of oxygen wouldn't be a problem.

This may be a simple question, but it has been difficult for me to find standard procedures for sparging a liquid with an inert gas, and I want to make sure I'm taken all the necessary precautions and steps.

• You're just using a stream of nitrogen. You can't have such a high flow that it will blow the liquid out of your container. As such, the risk of asphyxiation is quite low. On the other hand, if you work with a relatively dangerous liquid (your base is pretty dilute), you are at risk of blowing it out of the container and onto you, so you should do this in a fume hood with appropriate protective clothing and goggles. – Zhe Aug 8 '17 at 22:13
• Adding some nitrogen to the atmosphere (already 70% nitrogen) is not a big deal. – Zhe Aug 8 '17 at 22:14
• Not to count that if you deairate, you release air – Alchimista Aug 9 '17 at 23:00

The safety issue that I need to mention, though you are almost certainly already aware, is regarding the sodium hydroxide solution. Even at $\pu{0.1 M}$ it's not something that you want in anyone's eyes, so protection against splatter from the sparging solution would be prudent.