title: Reactive trace element enrichment in a highly modified, tidally inundated acid sulfate soil wetland: East Trinity, Australia.
abstract: 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 may be adsorbed to abundant reactive Fe phases or sequestered as sulfide minerals. These findings provide an important understanding of the fate and mobility of reactive iron, AVS and trace elements during tidal remediation of a formerly acidified Great Barrier Reef (GBR) catchment.
authors.affiliation: Southern Cross GeoScience, Southern Cross University, P.O. Box 157, Lismore NSW 2480, Australia. annabelle.keene@scu.edu.au
authors.forename: Annabelle F
authors.initials: AF
authors.lastname: Keene
authors.forename: Scott G
authors.initials: SG
authors.lastname: Johnston
authors.forename: Richard T
authors.initials: RT
authors.lastname: Bush
authors.forename: Edward D
authors.initials: ED
authors.lastname: Burton
authors.forename: Leigh A
authors.initials: LA
authors.lastname: Sullivan
mesh_terms: D052918:Environmental Restoration and Remediation; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000737:chemistry; D011793:Queensland; D012623:Seawater / Q000737:chemistry; D012987:Soil / Q000032:analysis*; D013431:Sulfates; D055871:Tidal Waves; D014131:Trace Elements; D053833:Wetlands
chemical_list: D008670:Metals; D012987:Soil; D013431:Sulfates; D014131:Trace Elements