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February 2009

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Subject:
From:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bev Christian <[log in to unmask]>
Date:
Tue, 17 Feb 2009 14:27:47 -0500
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Landfills have plenty of acid, in fact they have lots of acetic acid as
the by-product of bacteria breaking down rotting fruits and vegetable
matter. However, our lab group has mixed the solutions from the EPA
leaching test (low pH, high acetic acid content) with whole
Blackberries, Blackberries cut into the chunk sizes asked for the in
test and Blackberries ground to dust and then mixed them up with sand,
gravel topsoil, egg whites and cardboard.  In the case of the latter
three, there was little or no soluble lead left. Why?  Well I am not a
soil chemist, but I can tell you I picked egg whites and cardboard
because I know they both contained a lot of sulphide which will react
with ionic lead to form PbS, one of the most insoluble lead salts known
to man. I can't see lead leaving any properly maintained first world
landfill.

Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner engelmaier
Sent: Tuesday, February 17, 2009 2:11 PM
To: [log in to unmask]
Subject: Re: [TN] Leadfree has gone too far.


 Hi Shawn,
No, it is not about Pb dust, but in what environment it winds up
in--acidic or base [or pH level if you wish]. Stomachs are acidic
environments, hence Pb-poisioning when Pb is ingested; landfills and
most of nature, but not all is base,hence no leaching of Pb in landfills
as measured down-stream.

Werner


 


 

-----Original Message-----
From: Upton, Shawn <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, 17 Feb 2009 10:06 am
Subject: Re: [TN] Leadfree has gone too far.










I remember back about 20 years ago, going to Gettysburg and watching
people try to find old bullets in the ground.  I find it interesting
that lead is stable enough to stay in topsoil for decades, yet seemingly
absorbed into the bloodstream very easily.  Yet, unless if I am
mistaken, there are little precautions for handling solid lead (based
upon what little I know of OSHA rules for soldering--we went through
that a couple of years ago and I don't remember anything bad being found
for us) required, outside of washing ones hands (and presumably not
nibbling on it).

It's all about lead dust, apparently.  I guess old lead based paint, as
it cracks (UV exposure? Last dregs of solvents outgassing, leaving it
more brittle?) is what causes the most exposure?

Shawn Upton, KB1CKT
Test Engineer
Allegro MicroSystems, Inc
[log in to unmask]
603.626.2429/fax: 603.641.5336

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Tuesday, February 17, 2009 9:45 AM
To: [log in to unmask]
Subject: Re: [TN] Leadfree has gone too far.

Yeah Richard, you wonder where peoples heads are at sometimes.

A lot of people forget where most all elevated blood lead levels in
children come from. It's from the paint in older homes built prior to
1978 when lead in paint was banned. Blood lead levels in children have
declined 89% since the ban in paint and the lead in gasoline. That being
said, there's still a lot of pre-1978 homes out there that people are
renovating and not being as careful as they should when they do that,
and a large percentage of children are still getting contaminated from
the paint even though it was banned over 30-years ago. Take care of the
paint in all the older structures and you will most likely eliminate all
elevated blood lead levels in children.

Steve

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