Affiliation:
1. Federal University of Minas Gerais
2. Universidade Federal de Minas Gerais
Abstract
The biosorption of arsenic species by dried lettuce leaves (L.sativa) was investigated.
Arsenic sorption, that is not effective on in natura biomass, was enhanced when the biomass was
previously loaded with Fe(III). Analysis of X-ray Absorption Near-Edge Spectroscopy (XANES)
spectra showed that iron was incorporated as Fe(III) and arsenic as As(V), regardless the contact
with the lowest or highest valence species of these elements. The features of Extended X-ray
Absorption Fine-Structure Spectroscopy (EXAFS) spectra suggest that the nearest neighboring
atoms of iron ions are the same in all the samples, even in the As-Fe loaded ones. These results
indicate the arsenic oxyanions as the sorbed species on the iron-loaded biomass.
Publisher
Trans Tech Publications, Ltd.
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