Edouard Bastarache on tue 17 oct 00
Smart girl, Cindi!!!,
You said:
"If the dioxin has a half-life in soil of around 10 years (you said,
"greater" than
10 years, but that doesn't sound like 100,000 years at any rate), then the
dioxins in ball clay are likely to be a fairly recent addition. Not the
result of ancient deposits".
I said:
"In soil TCDD has an extremely long half-life time, greater than 10 years".
This statement was used by Lennart Hardell M.D. PhD. in Carl Zenz's
Occupational Medicine, last edition. This information was published by
italian authors after the Seveso accident in Italy in "Accidental exposure
to dioxin".
Now if we accept Michael Bank's hypothesis on the presence of dioxins
in certain clay deposits, and I think we should (his being quite better than
mine):
"I didn't refrain just to be nice Edouard... :) I was surprised and a
little unsettled to hear that dioxins could occur naturally in kaolinitic
clays. And a little sceptical to be honest. But then geologists once
thought plutonium didn't occur in nature, but now it appears to be there,
quite naturally.
Apart from your forest fire theory, another feasible source of
polychlorinated organic compounds (including dioxins and PCB's) could be
nearby coal beds. These are known to be rich in reactive aromatic compounds
such as phenols which could combine with the chlorine in naturally trapped
brine to produce the super carcinogens. Many fireclays and china clays are
closely associated with coal seams. The close association of coal with
white clay beds is genetic. Kaolinitic clays are often produced in
feldspathic rocks in contact with the coal by the strong acids which are a
by-product of the coalification process. Carcinogenic organic compounds
like the phenols, must migrate away from the coal into clays.
Michael Banks,
Nelson,New Zealand"
then we may think that dioxins are migrating into clay deposits
from neighboring coal seams on a more or less continuous basis.
Later,
Edouard Bastarache
Dans / In "La Belle Province"
edouardb@sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/~edouardb/
Cindy Strnad on wed 18 oct 00
You're always so tactful, Bass.
Okay, that makes sense.
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
earthenv@gwtc.net
http://www.earthenvesselssd.com
Smart girl, Cindi!!!,
You said:
"If the dioxin has a half-life in soil of around 10 years (you said,
"greater" than
10 years, but that doesn't sound like 100,000 years at any rate), then the
dioxins in ball clay are likely to be a fairly recent addition. Not the
result of ancient deposits".
I said:
"In soil TCDD has an extremely long half-life time, greater than 10 years".
This statement was used by Lennart Hardell M.D. PhD. in Carl Zenz's
Occupational Medicine, last edition. This information was published by
italian authors after the Seveso accident in Italy in "Accidental exposure
to dioxin".
Now if we accept Michael Bank's hypothesis on the presence of dioxins
in certain clay deposits, and I think we should (his being quite better than
mine):
"I didn't refrain just to be nice Edouard... :) I was surprised and a
little unsettled to hear that dioxins could occur naturally in kaolinitic
clays. And a little sceptical to be honest. But then geologists once
thought plutonium didn't occur in nature, but now it appears to be there,
quite naturally.
Apart from your forest fire theory, another feasible source of
polychlorinated organic compounds (including dioxins and PCB's) could be
nearby coal beds. These are known to be rich in reactive aromatic compounds
such as phenols which could combine with the chlorine in naturally trapped
brine to produce the super carcinogens. Many fireclays and china clays are
closely associated with coal seams. The close association of coal with
white clay beds is genetic. Kaolinitic clays are often produced in
feldspathic rocks in contact with the coal by the strong acids which are a
by-product of the coalification process. Carcinogenic organic compounds
like the phenols, must migrate away from the coal into clays.
Michael Banks,
Nelson,New Zealand"
then we may think that dioxins are migrating into clay deposits
from neighboring coal seams on a more or less continuous basis.
Later,
Edouard Bastarache
Dans / In "La Belle Province"
edouardb@sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/~edouardb/
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