Re: Phytoremediation, old tire, etc.
Mollyanne M Meyn wrote:
Ain't nothing that can metabolize Zinc -- too much and your plant
dies. Cadmium, alas, is sucked right up in plants (grains just love it)
and stores such that when WE eat the plants, all that nasty stuff is
released into our bodies and WE aren't able to process or store it.
I too have questioned the toxicity. I think the question is whether or not
plants take up toxic compounds from tires, and whether or not they
metabolize toxic compounds.
Uh, no. There are several bacteria which will break down the toxic to into
the non-toxic, but the phytoremediation has ALWAYS meant using a plant that
will absorb high levels of a toxin and still live, then harvesting the
plant and burning the whole thing in a toxic waste incinerator. Check the
archives of this list -- there were some great explanations of the process
in the past.
I've read that sometimes plants can "purify"
toxic conditions in the soil, which I assume to mean that toxic compounds
are broken down into non-toxic elements and compounds by plant metabolism.
If the soil is low in zinc,
then maybe the tires are a good thing?
It's a very rare soil, especially in an urban area, that is low in zinc.
Not a research subject that USDA has been/would be willing to fund under
current administration. It gets worse when you want to find info on
sewage sludge! ;-P
It is hard to find info about toxic chemicals that leach from tires when
left in the soil.
Always consider an active soil to be a slow burn -- if you've got plenty of
microorganisms in your soil, "burning" is taking place. If toxins are
being released through burning, your microbes are probably doing the same
thing on a much longer timeline.
Easier to find out about the toxic chemicals that are
released when tires are burned.
Dorene Pasekoff, Coordinator
St. John's United Church of Christ Organic Community Garden and Labyrinth
A mission of
St. John's United Church of Christ, 315 Gay Street, Phoenixville, PA 19460
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