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what is argon purged USP ethanol? Does it mean it's purer?
Posted: Fri Mar 04, 2011 3:04 am
by kwfx
what is argon purged USP ethanol? Does it mean it's purer than regular 190 proof ethanol?
Thanks.
Re: what is argon purged USP ethanol? Does it mean it's pure
Posted: Fri Mar 04, 2011 1:24 pm
by Consumer Products Guy
I don't know what "argon purged" is.
200 proof ethanol (no methanol or IPA) is available from Sigma-Aldrich or alcohol suppliers. Be aware that HPLC grade alcohol may also contain 5% methanol and/or 5% IPA, and be anhydrous or 200 proof but still not be what you want.
USP charges a zillion dollars for everything.
Re: what is argon purged USP ethanol? Does it mean it's pure
Posted: Mon Mar 07, 2011 9:01 pm
by LC_labrat
If taken literally I would think it means to purge the USP ethanol with argon gas, similar to a helium purge, to remove air bubbles? Now why you wouldn't just use an in-line degasser I'm not sure. Reminds me of an article by Dolan in LC Troubleshooting on Grandma's Ham.
Re: what is argon purged USP ethanol? Does it mean it's pure
Posted: Tue Mar 08, 2011 12:14 am
by tom jupille
Actually, argon purge would make bubble problems worse. I seem to recall that argon is more soluble than nitrogen.
