Re: lead
Hi - I think the Trinity phytoremediation project web site has changed. I
found it at http://www.trincoll.edu/prog/soilanalysis/. The site shows lead
concentrations did decrease dramatically in the soil but, unfortunately, the
site doesn't say how much lead was found in the harvested plants. I'm
curious how much lead was absorbed by the plants as opposed to just leaching
further into the soil. All that cultivation, watering, etc. (plus
mysterious proprietary soil amendments as mentioned in the Edenspace
website) might have carried some of the missing lead into deeper and
unsampled soil. The most important measure of this remediation is how much
lead was actually carrried away when the plants were harvested. The Trinity
and Edenspace web sites seem silent on that.
Bruce Wittchen
----- Original Message -----
From: "Jack N. Hale" <jackh@knoxparks.org>
To: <community_garden@mallorn.com>
Sent: Thursday, June 29, 2000 3:22 PM
Subject: RE: [cg] lead
> Hi folks-
> Edenspace uses Indian Mustard and another variety of mustard, sunflowers,
> and now a type of turf grass to "mine" lead in soil. They claim that
> special proprietary varieties and cultivation methods are necessary to
make
> the process effective, and they would be prepared to work with folks on
that
> for a price. The methods depend on the nature of the lead in the soil
> (e.g. - no plant will pick up bullet fragments at a firing range), the
> nature of the site (large open field, land around an occupied house,
rubble
> strewn vacant lot, etc.), and the ultimate use of the land. It's an
> interesting area.
>
> Jack Hale
>
> -----Original Message-----
> From: community_garden-admin@mallorn.com
> [community_garden-admin@mallorn.com] On Behalf Of Honigman, Adam
> Sent: Thursday, June 29, 2000 1:24 PM
> To: community_garden@mallorn.com
> Subject: RE: [cg] lead
>
> Kristin,
>
> This was in May's archived messages:
>
>
>
>
> To: "Community Garden List Serve" <community_garden@mallorn.com>
> Subject: [cg] Phytoremediation gets the lead out
> From: "Jack N. Hale" <jackh@knoxparks.org>
> Date: Fri, 12 May 2000 16:39:47 -0400
> Content-Transfer-Encoding: 7bit
> Content-Type: text/plain;charset="iso-8859-1"
> Importance: Normal
> List-Id: Help in developing or enhancing community garden programs.
> Sender: community_garden-admin@mallorn.com
>
>
>
> During the summer of 1999 a group of six students from Trinity College
> planted special seeds in a vacant lot in Hartford, Connecticut. The lot,
> part of which once housed a paint store, was heavily contaminated with
lead.
> One area tested at over 1800 parts per million (the EPA limit for
> residential property is 500 ppm). After 2 crops of Indian Mustard, the
lead
> level was below 600 ppm everywhere, and below 500 ppm in 80% of the test
> sites. Plants are pulled up, dried, and disposed of as hazardous waste.
> This total process is referred to as phytoremediation.
> The Knox Parks Foundation is developing a community garden on the site
this
> spring, although they hope to further reduce lead levels with more
> plantings. This process has some interesting potential applications to
> vacant lots, gardens, and residential properties, although it is far from
> being an established and well regimented practice.
> For more information on the project, contact Jack Hale at Knox Parks
> Foundation (jackh@knoxparks.org) (860/523-4276) or visit the web site
> created by the students who carried out the project
> (http://caribou.cc.trincoll.edu/prog_soilanalysis/) or the web site for
> Edenspace, the company that provides the seeds ( www.edenspace.com ).
>
> Jack Hale
>
>
>
> _______________________________________________
> community_garden maillist - community_garden@mallorn.com
> https://secure.mallorn.com/mailman/listinfo/community_garden
>
> > -----Original Message-----
> > From: Kristin Faurest [SMTP:kfaurest@hotmail.com]
> > Sent: Thursday, June 29, 2000 1:43 PM
> > To: community_garden@mallorn.com
> > Subject: [cg] lead
> >
> > _
> > I know this was discussed fairly recently but I can't seem to find the
> > archived messages on this subject - what plants are most useful in
ridding
> >
> > soil of its lead content?
> >
> > ________________________________________________________________________
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