title: Effect of soil ageing on in vivo arsenic bioavailability in two dissimilar soils.
abstract: Arsenic (As) bioavailability in spiked soils aged for up to 12 months was assessed using in vitro and in vivo methodologies. Ageing (natural attenuation) of spiked soils resulted in a decline in in vivo As bioavailability (swine assay) of over 75% in soil A (Red Ferrosol) but had no significant effect on in vivo As bioavailability even after 12 months of ageing in soil B (Brown Chromosol). Sequential fractionation, however, indicated that there was repartitioning of As within the soil fractions extracted during the time course investigated. In soil A, the As fraction associated with the more weakly bound soil fractions decreased while the residual fraction increased from 12% to 35%. In contrast, little repartitioning of As was observed in soil B indicating that natural attenuation may be only applicable for As in soils containing specific mineralogical properties.
authors.affiliation: Centre for Environmental Risk Assessment and Remediation, Division of Information Technology, Engineering and the Environment, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia. Albert.Juhasz@unisa.edu.au
authors.forename: Albert L
authors.initials: AL
authors.lastname: Juhasz
authors.forename: Euan
authors.initials: E
authors.lastname: Smith
authors.forename: John
authors.initials: J
authors.lastname: Weber
authors.forename: Ravi
authors.initials: R
authors.lastname: Naidu
authors.forename: Matthew
authors.initials: M
authors.lastname: Rees
authors.forename: Allan
authors.initials: A
authors.lastname: Rofe
authors.forename: Tim
authors.initials: T
authors.lastname: Kuchel
authors.forename: Lloyd
authors.initials: L
authors.lastname: Sansom
mesh_terms: D000818:Animals; D001151:Arsenic / Q000378:metabolism* / Q000493:pharmacokinetics*; D001682:Biological Availability; D012987:Soil / Q000032:analysis*; D013552:Swine; D013997:Time Factors
chemical_list: D012987:Soil; D001151:Arsenic