Reactive trace element enrichment in a highly modified, tidally inundated acid sulfate soil wetland

East Trinity, Australia

Annabelle F. Keene, Scott G. Johnston, Richard T. Bush, Edward D. Burton, Leigh A. Sullivan

Research output: Contribution to journalArticle

26 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)620-626
Number of pages7
JournalMarine Pollution Bulletin
Volume60
Issue number4
DOIs
Publication statusPublished - 2010
Externally publishedYes

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