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Full-Text Articles in Physical Sciences and Mathematics
Enrichment And Heterogeneity Of Trace Elements At The Redox-Interface Of Fe-Rich Intertidal Sediments, Annabelle Keene, Scott Johnston, Richard Bush, Edward Burton, Leigh Sullivan, Matthew Dundoon, Angus Mcelnea, C Smith, Col Ahern, Bernard Powell
Enrichment And Heterogeneity Of Trace Elements At The Redox-Interface Of Fe-Rich Intertidal Sediments, Annabelle Keene, Scott Johnston, Richard Bush, Edward Burton, Leigh Sullivan, Matthew Dundoon, Angus Mcelnea, C Smith, Col Ahern, Bernard Powell
Associate Professor Edward D Burton
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 tidal wetland. Fe-rich sediments at the surface-water interface (0–10 mm in 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 …
Liberation Of Acidity And Arsenic From Schwertmannite: Effect Of Fulvic Acid, Chamindra Vithana, Leigh Sullivan, Edward Burton, Richard Bush
Liberation Of Acidity And Arsenic From Schwertmannite: Effect Of Fulvic Acid, Chamindra Vithana, Leigh Sullivan, Edward Burton, Richard Bush
Associate Professor Edward D Burton
Schwertmannite is one of the major components that produces acidity in acid mine drainage (AMD) and acid sulfate soils (ASS) and is also known to be an effective scavenger of Arsenic (As) in such environments. Fulvic acid (FA) is an active component of natural organic matter (NOM) and is known to interact strongly with both schwertmannite and As. Two main environmental hazards related to schwertmannite are acidity liberation and potential re-mobilization of adsorbed or co-precipitated As upon hydrolysis. This study focused on understanding the behaviour of As-substituted schwertmannite with regard to the potential of acidity liberation, the effect of FA …
A Sequential Extraction Procedure For Acid-Sulfate Soils: Partitioning Of Iron, Salirian Claff, Leigh Sullivan, Edward Burton, Richard Bush
A Sequential Extraction Procedure For Acid-Sulfate Soils: Partitioning Of Iron, Salirian Claff, Leigh Sullivan, Edward Burton, Richard Bush
Associate Professor Edward D Burton
A new sequential extraction scheme for acid sulfate soil materials has been evaluated for iron partitioning in a range of synthetic iron-bearing minerals and natural acid sulfate soil materials. This sequential extraction procedure employs six steps to quantify (1) exchangeable (magnesium chloride extractable), (2) acid (hydrochloric acid) soluble, (3) reactive organic-bound (pyrophosphate extractable), (4) crystalline oxide (citrate buffered dithionite (CBD)) extractable, (5) pyrite-bound (nitric acid extractable) and (6) residual (acid/peroxide digestible) forms of iron. Given its intended use for acid sulfate soil materials that frequently contain pyrite, a primary aim of this new sequential extraction procedure was to differentiate iron …
Reactive Trace Element Enrichment In A Highly Modified, Tidally Inundated Acid Sulfate Soil Wetland: East Trinity, Australia, Annabelle Keene, Scott Johnston, Richard Bush, Edward Burton, Leigh Sullivan
Reactive Trace Element Enrichment In A Highly Modified, Tidally Inundated Acid Sulfate Soil Wetland: East Trinity, Australia, Annabelle Keene, Scott Johnston, Richard Bush, Edward Burton, Leigh Sullivan
Associate Professor Edward D Burton
This study examines the abundance of trace elements in surface sediments of a former acid sulfate soil (ASS) wetland subjected to marine tidal inundation. Sediment properties of this highly modified study site are compared with those of an adjacent unmodified, intertidal mangrove forest. Whilst some trace elements (Al, Cd, Mn, Ni and Zn) were clearly depleted due to mobilisation and leaching in the previous oxic–acidic phase, other trace elements (As and Cr) displayed significant enrichment in the tidally inundated ASS. Many trace elements were strongly associated with the reactive Fe and acid volatile sulfide (AVS) fractions, suggesting that trace elements …