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Enrichment and heterogeneity of trace elements at the redox-interface of Fe-rich intertidal sediments

Southern Cross University
Keene, Annabelle ; Johnston, Scott ; Bush, Richard ; Burton, Edward ; Sullivan, Leigh ; Dundon, Matthew ; McElnea, Angus ; Smith, C ; Ahern, Col ; Powell, Bernard ; Environmental Analysis Laboratory, Southern Cross University ; Environmental Analysis Laboratory Southern Cross University
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4226/47/550f4f297353c&rft.title=Enrichment and heterogeneity of trace elements at the redox-interface of Fe-rich intertidal sediments&rft.identifier=10.4226/47/550f4f297353c&rft.publisher=Southern Cross University&rft.description=Redox-interfacial sediments can undergo radical geochemical changes with oscillating tides. In this study, we examine trace element enrichment and availability, at both landscape and pedon-scales, in the surface sediments of a remediating acidic tidalwetland. Fe-rich sediments at the surface-water interface (0–10mmin depth) were collected across an elevation gradient spanning the supratidal to subtidal range. These sediments were analysed for solid phase Fe fractions and trace elements (As, Pb, Cr, Cu, Mn, Ni, Zn, V, B, Co, Mo, Ba and U) via dilute HCl-extractions and total digests. Their concentrations were compared with those of underlying (0.05–0.65 m in depth) former sulfuric horizon sediments of a coastal acid sulfate soil (CASS). Reactive Fe was enriched at the redox interface by up to 16 times (197 g Fe/kg) that of the former sulfuric horizon. The proportion of total trace elements associated with reactive phases was high in interfacial sediments, representing over 90% of B and U and 50% of Pb, Cu, Zn, V and Ba extractable by dilute HCl. The interfacial sediments were particularly enriched in reactive Cr, Cu, Ni, Zn, B, Mo and U, with reactive B, Mo and U concentrations between 5 and 10 times greater than in the former sulfuric horizon. Surface enrichment of trace elements is strongly coassociated with Fe(III) mineralisation, likely via sorption and co-precipitation processes. Enrichment is highly spatially heterogeneous and is strongly influenced by elevation and tidal zonation at a landscape-scale and by sediment micro-topography and preferential advective transport via surface connected macropores at the pedon-scale. The results from this study provide new insights to the processes influencing trace element enrichment in Fe-rich redox-interfacial sediments across a remediating acidic tidal wetland.Data Processing:Excel, SPSSData Processing:Excel, SPSS&rft.creator=Keene, Annabelle &rft.creator=Johnston, Scott &rft.creator=Bush, Richard &rft.creator=Burton, Edward &rft.creator=Sullivan, Leigh &rft.creator=Dundon, Matthew &rft.creator=McElnea, Angus &rft.creator=Smith, C &rft.creator=Ahern, Col &rft.creator=Powell, Bernard &rft.creator=Environmental Analysis Laboratory, Southern Cross University &rft.creator=Environmental Analysis Laboratory Southern Cross University &rft.date=2014&rft.coverage=145.82555379999997,-16.8932854&rft.coverage=Latitude: -16.893 Longitude: 145.825&rft.coverage=East Trinity Cairns&rft_rights=CC BY-NC-SA V3.0&rft_subject=acid sulfate soils&rft_subject=iron&rft_subject=trace elements&rft_subject=tidal wetland&rft_subject=remediation&rft_subject=PHYSICAL GEOGRAPHY AND ENVIRONMENTAL GEOSCIENCE&rft_subject=EARTH SCIENCES&rft_subject=GEOCHEMISTRY&rft_subject=SOIL SCIENCES&rft_subject=ENVIRONMENTAL SCIENCES&rft.type=dataset&rft.language=English Access the data

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Redox-interfacial sediments can undergo radical geochemical changes with oscillating tides. In this study, we examine trace element enrichment and availability, at both landscape and pedon-scales, in the surface sediments of a remediating acidic tidalwetland. Fe-rich sediments at the surface-water interface (0–10mmin depth) were collected across an elevation gradient spanning the supratidal to subtidal range. These sediments were analysed for solid phase Fe fractions and trace elements (As, Pb, Cr, Cu, Mn, Ni, Zn, V, B, Co, Mo, Ba and U) via dilute HCl-extractions and total digests. Their concentrations were compared with those of underlying (0.05–0.65 m in depth) former sulfuric horizon sediments of a coastal acid sulfate soil (CASS). Reactive Fe was enriched at the redox interface by up to 16 times (197 g Fe/kg) that of the former sulfuric horizon. The proportion of total trace elements associated with reactive phases was high in interfacial sediments, representing over 90% of B and U and 50% of Pb, Cu, Zn, V and Ba extractable by dilute HCl. The interfacial sediments were particularly enriched in reactive Cr, Cu, Ni, Zn, B, Mo and U, with reactive B, Mo and U concentrations between 5 and 10 times greater than in the former sulfuric horizon. Surface enrichment of trace elements is strongly coassociated with Fe(III) mineralisation, likely via sorption and co-precipitation processes. Enrichment is highly spatially heterogeneous and is strongly influenced by elevation and tidal zonation at a landscape-scale and by sediment micro-topography and preferential advective transport via surface connected macropores at the pedon-scale. The results from this study provide new insights to the processes influencing trace element enrichment in Fe-rich redox-interfacial sediments across a remediating acidic tidal wetland.

Data Processing:Excel, SPSS
Data Processing:Excel, SPSS
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Enrichment and heterogeneity of trace elements at the redox-interface of Fe-rich intertidal sediments
EsploroIEID : 1167312180002368

Coastal Wetland Remediation - East Trinity Site - Cairns
uri : https://projects.ands.org.au/id/ODC09

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uri : https://www.qld.gov.au/environment/land/management/soil/acid-sulfate/east-trinity

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uri : https://www.crccare.com/case-study/restoring-acidified-wetlands

Saving acid wetlands - Catalyst ABC TV Program
uri : https://www.abc.net.au/catalyst/saving-acid-wetlands/11012898

Submitted: 20150307

Available: 20150307

Issued: 2014

Created:

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145.82555379999997,-16.8932854

145.8255538,-16.8932854

text: Latitude: -16.893 Longitude: 145.825

text: East Trinity Cairns

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Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE) - A national demonstration site for innovative acid sulfate soil management

local : 20100095

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