> ==========
> bionet/microbiology #5846, from j.rieuwerts at ic.ac.uk, 980 chars, Fri
02 May 1997 10:15:24 -0
> ----------
> Article: 6884 of bionet.microbiology
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> From: j.rieuwerts at ic.ac.uk> Newsgroups: bionet.microbiology
> Subject: Question on metal exposure
> Date: Fri, 02 May 1997 10:15:24 -0700
> Organization: Imperial College, London, UK
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>> Can anyone help me? I need to know how microbiota are exposed to
metals
> in soils - i.e. do they take up metals only from the soil solution or
> can they obtain them from solid phases also (adsorbed ions for
> example)? Also will microbes only be exposed to free metal ions or
are
> complexed species available to them as well?
>> Many thanks in advance
For what it is worth,A PhD student of mine (Dr R Paul Bardos now at
Nottingham Trent University) carried out some work on relating metal
tolerances of soil bacterial isolates to "ambient heavy metal levels".
There was no relationship with total metal. (We didn't really expect
there to be). Little relationship to "extracted" metal levels, using the
various popular extractants. The best relationship was with metal levels
in soil solution derived from either centrifuged solution or solution
displaced with organic solvent.These soil solutions could have included
both ionic and complexed forms.
Peter Harris,
Department of Soil Science,
The University of Reading, UK.
AKA <P.J.Harris at reading.ac.uk>
