| Topic: |
Science > Physics |
| User: |
"stuomiva" |
| Date: |
25 May 2006 11:03:02 PM |
| Object: |
Rate of dissolving gases to water |
Hi all working scientists,
I'm wondering at what rate degassed water returns to equilibrium with
respect to dissolved air. For example, 1 L of (vacuum-) degassed
nanopure water is left at 25C and 1 atm in 1 L erlenmeyer flask,
uncovered mouth, diameter at the water surface is appr. 2.5 inches, no
stirring. Is there a source for tabulated values for different gases
and for commonly used solvents? All help is greatly appreciated.
Sami Tuomivaara
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| User: "Andy Resnick" |
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| Title: Re: Rate of dissolving gases to water |
26 May 2006 08:11:59 AM |
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stuomiva wrote:
Hi all working scientists,
I'm wondering at what rate degassed water returns to equilibrium with
respect to dissolved air. For example, 1 L of (vacuum-) degassed
nanopure water is left at 25C and 1 atm in 1 L erlenmeyer flask,
uncovered mouth, diameter at the water surface is appr. 2.5 inches, no
stirring. Is there a source for tabulated values for different gases
and for commonly used solvents? All help is greatly appreciated.
I imagine it's related to the diffusivity of the molecular species on
water (or whatever other solvent you are using). The CRC has some
tabulated data (F-44 and thereabouts in my version, plus an exhaustive
list of references). I confess the units of diffusivity (cm^2/s) seem
awkward to use here. Mikhailov and Ozisik's "Unified analysis and
solutions of heat and mass diffusion" (Dover) would seem to be helpful.
The quick answer is that if you want a quick-and-dirty answer, probably
just do the experiment.
--
Andrew Resnick, Ph.D.
Department of Physiology and Biophysics
Case Western Reserve University
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