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> From: "Buckley, Kevin" <kevin.buckley at nectech_co.uk>
> Subject: Ammonia/Ammonium
> I'm curious to know which (or both?) of either Ammonia (NH3) or Ammonium
> (NH4+) plants can use directly & browsing the archives hasn't helped.
The equilibrium between the two is _very_ fast. It just consists
of the NH4+ losing a proton (usually to H2O to form H3O+), or NH3
gaining a proton. These reactions are fast even by chemists' standards.
If something can use NH3, then it will be able to use both NH3 and NH4+,
in effect, because interchange between the two is so quick. So, the
plants will use both.
Equilibrium consists of _both_ reactions happening at the
same time, not nothing happening.
> Is the Ammonia/Ammonium ratio particularly temperature dependent? What
> would the ratio be at pH=8.2 & temperature=24C?
Not different enough to worry about.
Paul Sears Ottawa, Canada