Date: Thu, 12 Jun 97 08:42:00 EST From: "Mellard, David" <dam7@ATSDHA1.EM.CDC.GOV> To: cp@opus.hpl.hp.com Message-Id: <aabcdefg2291$foo@default> Subject: RE: Metal Water Trays
Hi Ryan,
It's funny you should ask this question since this week I recieved lead
concentration data on fruit and vegetables taken from a hazardous waste site
with lead contamination in people's yard.
In your set up, lead will leach slowly into the water because of its
acidity. Generally, lead will be found in the below ground portion of some
root crops when grown in highly lead-contaminated soil. Lead can sometimes
be transported into the leafy green part of some vegetables but higher
levels are found in particulated clinging to the leaves. Lead definitely
is not transported into fruit (again in significant quantities). One
surprise that we found at this site in Puerto Rico is that lead is
transported into the above ground fleshy part of yuca plants in rather large
quantities.
This doesn't really answer your specific question but my guess is that at
most lead may get into some of the roots. At most. Since you have not
experienced any problems in the last few years, that's your best indicator
that toxic levels of lead are not getting into your cps. I wouldn't worry
about it. If you're still worried and want peace of mind, you could spray
the soddered area with some type of water repellant sealant.
This is hot topic for me this week, hence forgive the details.
David
> A few years ago I made a water tray out of sheet metal and soldered
>the corners together with lead for my CP's. I now am worried if there is+
>any danger of metals dissolving into the water ( that constantly sits in
>the tray ) over time. The CP's are doing great, but for how long?
> -Ryan-
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