Re: Humus, humic acid and natural chelating agents
> > Humic acids are removed by activated carbon. There are clear
> > implications for fate of trace elements in aquaria, perhaps Espe
> > freshwater aquaria, in that statement.
> That's why few aquatic gardeners use carbon in their systems ;-)
Ah, but I don't believe that I've ever heard anyone say that the removal
of trace elements is mediated by their removal as humic acid chelates.
And I also know of some experimental determinations indicating that trace
elements are not removed by activated carbon (in otherwise pure water)
except at extreme pH values.