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Schlenk technique- argon inert atmosphere

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Grasshopper:
I don't think I explained myself very well; I'd just like to add that I'm not going to open the pump directly to either air or the argon source :) just the usual procedure i.e. attach reaction vessel to Schlenk line, freeze, evacuate the gas from the top of it, allow to thaw, etc etc.... I just had in my mind a vague memory of someone telling me (years ago) not to do this when the inert gas in the Schlenk line is Ar instead of N2, and I was wondering whether that memory was valid. On the whole I think I'd rather not take the risk if there's some potential for condensing the gas in the trap. A dry ice trap is an idea, though, thanks OrganicDan  :)

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