Ed,
If you have a window manufacturer near you they will probably use argon and possibly other inert gases as a UV shield gas for use in "Low E" windows. I would think that any of the gases in the argon, xenon, nitrogen, possibly even helium class would work as a shield to slow oxidation of the chemicals.

As an aside, I have heard other photographers that use marbles in their partially filled chemical bottles to displace the liquid enough to limit the inclusion of oxygen through partially filled bottles. I have seen marbles that are used in some of the crafts in craft stores. Not sure if they are glass, though.

Good luck, let us know what you come up with.