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Re: TEQ

Hello,

     TEQ stands for Toxic Equivalent, and it is short for a chemical's
approximate toxicity when compared with TCDD (tetrachlorodibenzo-p-dioxin),
the most toxic of the dioxins. Dioxin's toxicity as a hormone disruptor is
based on its shape and size, and dioxin scientists have come up with the TEQ
as a measure of the toxicity of all of the dibenzo-dioxins, dibenzo-furans,
and coplanar polychlorinated biphenyls (PCBs), based on their chemical
sizes, shapes, and undoubtedly other characteristics. (I believe the
scientist who proposed the system was Steve Safe, but I'm not sure...).

      Thus the TEQ of TCDD itself would be 1.0. I believe the TEQ of TCDF
(tetrachlorodibenzofuran) is 0.1, but I don't have the TEQ equivalence table
in front of me. (One can be found in the book Dying From Dioxin by Lois
Gibbs).

Regards
Jon
----- Original Message -----
From: Sittisak Pui-ock (HS5DRL) <sittisak@tubtim.cri.or.th>
To: Multiple recipients of list DIOXIN-L <dioxin-l@essential.org>
Sent: Monday, November 01, 1999 9:33 PM
Subject: TEQ


> Hi everybody,
>
> I have seen word like "TEQ" for unit of Dioxin, but really don't have an
> idea what it's about? Does anyone please explain to me that TEQ means?
>
> Regards,
> Sittisak
>
> ++++++++++++++++++++++++++++++++++++
> +  Sittisak  Pui-ock, HS5DRL       +
> +  Environmental Toxicology,       +
> +  Chulabhorn Research Institute   +
> +  Bangkok, Thailand 10210         +
> +  http://www.cri.or.th/~sittisak  +
> ++++++++++++++++++++++++++++++++++++
>
>