%0 Journal Article
%T Role of Organic Matter in the Adsorption/Desorption of Cr, Cu and Pb in Competitive Systems in Two Different Soils
%A Leandro Antunes Mendes
%A Luis Felipe Perez Bucater
%A Maria Diva Landgraf
%A Maria Ol¨ªmpia Oliveira Rezende
%J Open Access Library Journal
%V 1
%N 7
%P 1-5
%@ 2333-9721
%D 2014
%I Open Access Library
%R 10.4236/oalib.1101022
%X The various methods of remediation of contaminated
soils include isolation, immobilization, toxicity reduction, physical
separation and extraction. In this context, a noteworthy technique is vermicomposting,
which uses worms to break down recent organic matter, turning it into a chemically
more stable form able to retain metal ions, rendering them unavailable to the
environment. To understand the transport of these elements in the soil, it is
necessary to study their dynamics in the environment. Thus, the aim of this
study was to evaluate the adsorption and desorption of metal species in soils,
assessing the influence of added organic matter in order to assess the risk
that these elements carry to the environment and human health. The curves of
adsorption of three toxic elements in the soil were determined by adding a
solution of metal salts at various concentrations, leaving 24 h centrifuging
and analyzing the supernatant. The concentrations of adsorbed components were
taken as the difference between those added initially and those remaining after
the equilibration (C<sub>e</sub>). Desorption was carried out by adding a
solution of 0.01 mol¡¤L<sup>©�1</sup> CaCl<sub>2</sub>¡¤2H<sub>2</sub>O
to soil samples where the metal ions were adsorbed. Following the same
procedure, the concentrations of desorbed metal ions were measured.
%K Vermicomposting
%K Sorption of Metal Species in Soils
%K Remediation
%K Contaminated Soils
%U http://www.oalib.com/paper/3125853