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RE: Background Dioxin Levels?
This 2 -3 ppt range is a bit low actually from some references I have
seen. A study of soils in the UK had mean values of background of 6ppt
for TCDD up to 143ppt for OCDD. The furans ranged from 16ppt for TCDF
to 32 ppt for HxCDF. This data can be found in:
Survey of Background Levels of PCDDs & PCDFs in UK Soils, Chemosphere,
Vol 18 Nos 1-6 pp 767-776 1989.
Some papers I have read find similar levels in the US. I am sorry, but
I do not have references to those at my fingertips.
From: Rebecca Leighton Katers
To: Multiple recipients of list
Subject: Background Dioxin Levels?
Date: Tuesday, August 26, 1997 8:11AM
I was just told by an FDA policy person that
recent information shows that dioxin background
levels range from 2 to 3 ppt.
This seemed awfully high to me, so I questioned
him and asked if he meant background
in the food supply or natural background in the
soil --- and he said natural background in soil.
He said that the 1 ppt limit for the chicken
recall and fish farms was simply their limit of detection,
not a regulatory number.
Can anyone recommend key documents which show natural
background levels are lower?
Rebecca Leighton Katers
Clean Water Action Council of N.E. Wisconsin
2220 Deckner Avenue
Green Bay, WI 54302