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dc.contributor.authorBackes, C. A.en
dc.contributor.authorMcLaren, Ronald G.en
dc.contributor.authorRate, A. W.en
dc.contributor.authorSwift, R. S.en
dc.date.accessioned2008-04-15T23:43:38Z
dc.date.issued1995en
dc.identifier.citationBackes, C. A.., McLaren, R. G., Rate, A. W., & Swift, R. S. (1995). Kinetics of cadmium and cobalt desorption from iron and manganese oxides. Soil Science Society of America Journal, 59(3), 778-785.en
dc.identifier.issn0361-5995en
dc.identifier.urihttps://hdl.handle.net/10182/437
dc.description.abstractOxides of Fe and Mn in soils are capable of sorbing large amounts of trace metal ions and can therefore be important in controlling trace metal concentrations in soil solution, and hence trace metal bioavailability in soils. There is, however, relatively little information on the rates of desorption of trace metals from oxide materials or on the factors affecting desorption rates. The objective of this study was to examine the kinetics of desorption of Cd and Co from two Fe oxides, goethite and ferrihydrite, and from two Mn oxides, hausmannite and cryptomelane. The concentrations of Cd and Co specifically sorbed by the oxides at pH 6.0 were greater for the Mn oxides than for the Fe oxides. The metals were also much less readily desorbed from the Mn than the Fe oxides and, in general, Cd was more readily desorbed than Co from all four oxides. Increasing the initial sorption period from 1 to 15 wk substantially decreased the proportion of sorbed Cd or Co subsequently desorbed from goethite, with a similar but much smaller effect also observed with the Mn oxides. Desorption kinetics for both Cd and Co were found to be described well by assuming either the occurrence of two simultaneous first-order desorption reactions, or by a continuous distribution of reaction sites, distributed lognormally with respect to desorption first-order rate constant. With increasing initial sorption period, the parameters obtained from fitting either type of kinetic equation to the experimental data could be interpreted as indicating a movement of metal ions to sites with slower desorption reactions.en
dc.format.extent778-785en
dc.language.isoenen
dc.publisherSoil Science Society of Americaen
dc.relationThe original publication is available from - Soil Science Society of Americaen
dc.rightsCopyright © 1995 Soil Science Society of Americaen
dc.subjectsoilsen
dc.subjecttrace metalsen
dc.subjectdesorptionen
dc.subjectcadmiumen
dc.subjectcobalten
dc.subjectAgronomy & Agricultureen
dc.titleKinetics of cadmium and cobalt desorption from iron and manganese oxidesen
dc.typeJournal Article
dc.subject.marsdenFields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300100 Soil and Water Sciences::300103 Soil chemistryen
lu.contributor.unitLincoln Universityen
lu.contributor.unitFaculty of Agriculture and Life Sciencesen
lu.contributor.unitDepartment of Soil and Physical Sciencesen
dc.subject.anzsrc05 Environmental Sciencesen
dc.subject.anzsrc06 Biological Sciencesen
dc.subject.anzsrc07 Agricultural and Veterinary Sciencesen
dc.relation.isPartOfSoil Science Society of America Journalen
pubs.issue3en
pubs.organisational-group/LU
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/SOILS
pubs.publication-statusPublisheden
pubs.volume59en


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