[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Don't add more than a tiny amount. The NH4+ ion is in a _very_
fast equilibrium with NH3. The concentrations of the two are equal at a
pH of about 9.25. At pH 8.25 the NH3 concentration is 1/10 of the
NH4+ concentration, at pH 7.25, 1/100 of it, and so on.
If you add just a small amount of an ammonium salt, it's the same
as adding ammonia - the pH of the solution will be decided by the main
buffer system there (HCO3-/CO2, usually), and the proportions of NH3
and NH4+ in the solution will be as above. Ammonia toxicity to fish is
well known, so be careful with it.
If you were to add lots, the NH4+/NH3 system could _become_ the
main buffering system. I don't think you want to go there.
Paul Sears Ottawa, Canada