EHP 106 775-792 (1998)

[DrBillC@aol.com]

Tony wrote:

>_Env Health Perspectives (snip) p.775-92 for that excelent in-depth review of
the
>validity of the TEF system, which says the TEF of OCDD (found in huge
>quantities) is not >0.000001 but may be 0.01! (as prev. posted here)).

Tony:

What article are you reading?  This is the report of the WHO TEFs reevaluation
group.  The data was first reported at Dioxin '97 and has been reproduced in
that EHP article.  There are three charts:  TEFs for mammals, birds and fish.
For both OCDF and OCDD the TEF was downgraded by a factor of 10 from 0.001 to
0.0001, <0.0001 and 0.0001 respectively.   I don't see any congener
reevaluated in the way you mention, however 1,2,3,7,8 PeCDD was upgraded from
0.5 to 1 in mammals.

Bill Carroll