@inproceedings{68dcb59b37b44da09089a5b202ff567d,
title = "Arsenic mobilization during seawater inundation of acid sulfate soils: Hydrogeochemical coupling at the tidal fringe",
abstract = "Coastal Acid Sulfate Soils (CASS) are rich in meta-stable iron (Fe - III) minerals that are important sorbents for arsenic (As) under oxic conditions. Tidal seawater inundation to remediate CASS has recently been trialed on a large scale and has potential to mobilize arsenic during the redox transition. Tidal seawater inundation caused reductive dissolution of As(V)-bearing Fe(III) minerals, resulting in elevated concentrations of Fe 2+ (2000 mg L -1) and As (∼400 μg L -1) in upper-intertidal zone groundwater. Oscillating vertical and horizontal hydraulic gradients caused by tidal pumping promoted upward advection of As and Fe 2+-enriched groundwater within the intertidal zone. This led to flux of As aq and Fe 2+ aq to surface waters and the accumulation of As(V)-enriched Fe(III) (hydr)oxides at the oxic sediment-water interface. Fe(III) (hydr)oxides at the sediment-water interface act as a natural reactive-barrier, retarding As flux to overlying surface waters. However, they also represent a highly transient phase that is prone to reductive dissolution during future redox boundary migration. A conceptual model is presented to explain landscape-scale patterns of As and Fe hydro-geochemical zonation.",
author = "Johnston, {S. G.} and Burton, {E. D.} and Keene, {A. F.} and Bush, {R. T.} and Sullivan, {L. A.}",
year = "2012",
language = "English",
isbn = "9780415637633",
series = "Arsenic in the Environment - Proceedings",
publisher = "CRC Press",
pages = "23--24",
editor = "Jack Ng and Barry Noller and Ravi Naidu and Jochen Bundschuh and Prosun Bhattacharya",
booktitle = "Understanding the Geological and Medical Interface of Arsenic, As 2012",
note = "4th International Congress on Arsenic in the Environment, As 2012 ; Conference date: 22-07-2012 Through 27-07-2012",
}