Effects of pH, competing ions and aging on arsenic(V) sorption and isotopic exchange in contaminated soils

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dc.contributor.authorRahman, MSen_AU
dc.contributor.authorClark, MWen_AU
dc.contributor.authorYee, LHen_AU
dc.contributor.authorComarmond, MJen_AU
dc.contributor.authorPayne, TEen_AU
dc.contributor.authorBurton, EDen_AU
dc.date.accessioned2024-02-28T22:52:00Zen_AU
dc.date.available2024-02-28T22:52:00Zen_AU
dc.date.issued2019-06en_AU
dc.date.statistics2024-02-29en_AU
dc.description.abstractCattle tick control in Australia using arsenicals from early 1900s to 1955 has led to the existence of some 1600 contaminated sites in northern New South Wales alone. Sorption processes play key roles in controlling arsenic (As) accessibility and subsequent mobility in these dip soils. As(V) sorption and accessibility in three As-contaminated soils and two uncontaminated soil types (ferralitic and sandy soils) are investigated utilizing batch sorption experiments and isotopic exchange techniques. The aged contaminated soils displayed little or no ability to sorb additional As(V), and increasing the soil pH caused a substantial reduction in As(V)-sorption and resulting in As(V)-release. Isotope exchange experiments further supported that any further exposure of the aged-contaminated-soils to additional As(V) increased As-mobilization potential. Amendments of phosphate greatly decreased As(V) sorption in aged-contaminated-soils where As-sorption sites were more highly saturated, whereas phosphate had little effect on As(V) sorption in pristine soils. Similarly, sulfate reduced As(V) sorption, but these effects were less marked than those for phosphate, hence, the application of both PO43− and SO42− in As(V)-contaminated-soils may lead to potential As(V)- mobilization. Conversely, Ca2+ increases As(V)-sorption, which is consistent with expected changes in the surface charge characteristics from Ca2+ sorption, and/or Ca-AsO4 precipitations, consequently Ca2+ amendments may improve As-retention, thereby decreasing As accessibility from cattle dip soils. Therefore, the detailed knowledge presented here provides new insights that may be useful for the assessment and management of the As-contaminated soils. © 2019 Elsevier Ltd.en_AU
dc.description.sponsorshipThe authors acknowledge the support from SCU, Australian Institute of Nuclear Science and Engineering (AINSE grant: ALNGRA13054)) and Australian Nuclear Science and Technology Organisation. We would specifically like to thank SCU staff member Barbara Harrison for helpful discussions and assistance.en_AU
dc.identifier.citationRahman, M. S., Clark, M. W., Yee, L. H., Comarmond, M. J., Payne, T. E., & Burton, E. D. (2019). Effects of pH, competing ions and aging on arsenic(V) sorption and isotopic exchange in contaminated soils. Applied Geochemistry, 105, 114-124. doi:10.1016/j.apgeochem.2019.04.016en_AU
dc.identifier.issn0883-2927en_AU
dc.identifier.issn1872-9134en_AU
dc.identifier.journaltitleApplied Geochemistryen_AU
dc.identifier.pagination114-124en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.apgeochem.2019.04.016en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15480en_AU
dc.identifier.volume105en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectIonsen_AU
dc.subjectpH Valueen_AU
dc.subjectArsenicen_AU
dc.subjectSoilsen_AU
dc.subjectContaminationen_AU
dc.subjectTicksen_AU
dc.subjectCattleen_AU
dc.subjectNew South Walesen_AU
dc.subjectIsotopesen_AU
dc.subjectSorptionen_AU
dc.subjectPhosphatesen_AU
dc.titleEffects of pH, competing ions and aging on arsenic(V) sorption and isotopic exchange in contaminated soilsen_AU
dc.typeJournal Articleen_AU
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