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How to evaporate a solution without introducing O2?

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onionfart:
Hi i'm studying geochemistry and i'm restarting a project that was abandoned due to covid. I can't use my former lab space where I jerry rigged a water bath and a vacumn pump to evaporate out an anoxic solution, which was honestly awful to use.

What's the easiest way to vent off all the liquid and keep the concentrate without exposing it to O2?

Babcock_Hall:
Many chemistry labs have a rotary evaporator ("rotovap").  If you could get access to one, that sounds like the easiest way.  Perhaps I am missing something.

onionfart:
Right but I would introduce O2 into that through regular use. I don't see a way to modify ours to be without O2. Its too big to fit in the anaerobic chamber.

Borek:
Purge with nitrogen?

Babcock_Hall:
One could purge with nitrogen before using the rotary evaporator.  During the rotary evaporation process itself, the sample is under a partial vacuum.  If one released the vacuum at the end with a Firestone valve, this would put the sample under nitrogen at the end.

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