Re: "other" dioxins

[Mitch Rice <mitch@bluemarble.net>]

On Thu, 31 Aug 1995 astile@mailhost.dpie.gov.au wrote:

> I am seeking information of RELATIVE toxicities of the various dioxins.
> 
> 2,3,7,8-tetrachloro-dibenzodioxin "2,3,7,8-TCDD"  is what is generally
> called "dioxin".  I have references to the higher chlorinated dioxins, but
> is there any published work on any of the following?
> 
> 1,3,6,8-TCDD
> 2,3,7-trichloro-dibenzodioxin
> 2,7-dichloro-dibenzodioxin
> dibenzo-dioxin   (with no chlorines)
> 
> I assume that these chemicals with fewer chlorines are less persistent in
> the environment and are therefore considered less of a "health" concern, but
> the assumption that they are less toxic???
> 
> Allen

I can cite no publications at the moment, but my understanding of this
subject has been that the more chlorine in the compound, the more toxic
it is, however, I had not heard that the less chlorine, the less the 
persistance in the environment.  Can anyone else add to this?

Mitch