es050950q_si_002.pdf (16.19 kB)
Chemical Speciation and Bioaccessibility of Arsenic and Chromium in Chromated Copper Arsenate-Treated Wood and Soils
journal contribution
posted on 2006-01-01, 00:00 authored by Peter S. Nico, Michael V. Ruby, Yvette W. Lowney, Stewart E. HolmThis research compares the As and Cr chemistry of
dislodgeable residues from chromated copper arsenate (CCA)-treated wood collected by two different techniques
(directly from the board surface either by rubbing with a
soft bristle brush or by rinsing from human hands after contact
with CCA-treated wood) and demonstrates that these
materials are equivalent in terms of both the chemical form
and bonding of As and Cr and in terms of the As leaching
behavior. This finding links the extensive chemical
characterization and bioavailability testing that has been
done previously on the brush-removed residue to a material
that is derived from human skin contact with CCA-treated wood. Additionally, this research characterizes
the arsenic present in biological fluids (sweat and simulated
gastric fluid) following contact with these residues. The
data demonstrate that in biological fluids the arsenic is
present primarily as free arsenate ions. Arsenic-containing
soils were also extracted into human sweat to evaluate
the potential for arsenic dissolution from soils at the skin
surface. For soils from field sites, only a small fraction
of the total arsenic is soluble in sweat. Based on comparisons
to reference materials that have been used for in vivo
dermal absorption studies, these findings suggest that the
actual relative bioavailability via dermal absorption of As
from CCA residues and soil may be well below the current
default value of 3% used by U.S. EPA.
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bioavailability testingEPAfluidtermleaching behaviorreference materialschemical Speciationresearcharsenate ionsboard surfacesweatchromated copper arsenateabsorption studieschemical characterizationskin surfacefield sitesCr chemistryskin contactchemical formCCA residuesU.Sarsenic dissolutiondislodgeable residuesdefault value
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