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Old 04-24-2006   #17 (permalink)
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Arrow Re: Terra Preta soils

[QUOTE=Michaelangelica]
Quote:
Originally Posted by Michaelangelica
So would Amazonian Natives have access to 'activated carbon'? Would the temperatures in pottery kilns be high enough to make the charcoal become activated? the research doesn't seem to make clear what sort of carbon we are talking about.
If 'activated' has more cavities; wouldn't this be a good thing?
Kiln temps high enough, yes. I don't have any knowledge on whether Amazonians purposefully manufactured activated charcoal.
More cavities=better in terms of how long the adsorption continues without further application of charcoal. Once the cavities have all filled, the charcoal is in effect 'used up' until or unless some other process releases it. Simple charcoal from a fireplace still adsorbs; breaking into smaller pieces increase surface area & so efficacy.


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semantics is not always just pedantic quibbling. ~ douglas r. hofstadter
 
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