Re: LIMIT VALUES FOR DIOXINS

[slester@essential.org]

On Fri, 19 Jan 1996, Carol Meeds WPB 407-433-2650 x 113 wrote:

> Date: Fri, 19 Jan 1996 08:24:35 -0500 (EST)
> From: Carol Meeds WPB 407-433-2650 x 113 <MEEDS_C@wpb1.dep.state.fl.us>
> To: Multiple recipients of list <dioxin-l@essential.org>
> Subject: Re: LIMIT VALUES FOR DIOXINS
> 
>     This question is interesting and I wonder if anyone could answer a 
>     few more to help my understanding?
>     
>     
>     I wonder how fentograms per cubic meter in the air co-relates to 
>     uptake.  Is the method primarily air deposition onto vegetation 
>     and then consumption by animals and concentration in fats?  Or is 
>     there more transport from the air to the soil to the water and 
>     then up through the food chain?  
>     
>     Is there a "background" level in soils from historical deposition? 
>     
>     Thanks,
>     Carol Meeds
>     Jupiter, Florida
> 


The EPA Reassessment on Dioxin lists the "background" levels for dioxin 
in soil to be 8 ppt according to one study, and 9 ppt according to 
another study.  This information is in Chapter 4, Volume 2 of the 
Exposure document.  
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