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Full-Text Articles in Physical Sciences and Mathematics
Oxidation Pathways Of Monosulfidic Black Ooze, Diane Fyfe, Leigh Sullivan, Richard Bush, Nicholas Ward
Oxidation Pathways Of Monosulfidic Black Ooze, Diane Fyfe, Leigh Sullivan, Richard Bush, Nicholas Ward
Dr Nicholas J Ward
Monosulfidic Black Ooze (MBO) describes an organic material, enriched with iron monosulfides, commonly found in Acid Sulfate Soil (ASS) landscapes. Dominating the surficial sediment layer, this highly mobile material is easily incorporated into the water column when disturbed, resulting in severe deoxygenation and acidification. MBO has recently been implicated in massive fish kills associated with flood events in north eastern NSW, Australia. The process of acidification and the formation of intermediate sulfur species have been examined in ASS; however, there is little information on the chemical behaviour of MBO originating from drainage channels in ASS landscapes. Intermediate sulfur species are …
Hydro-Geochemical Coupling In Seawater Inundation Acid Sulfate Soils: Mobilisation Of Arsenic And Hysteresis In Iron And Sulfur Cycling, Scott Johnston, Annabelle Keene, Edward Burton, Richard Bush, Leigh Sullivan
Hydro-Geochemical Coupling In Seawater Inundation Acid Sulfate Soils: Mobilisation Of Arsenic And Hysteresis In Iron And Sulfur Cycling, Scott Johnston, Annabelle Keene, Edward Burton, Richard Bush, Leigh Sullivan
Associate Professor Edward D Burton
A large-scale field trial indicates that tidal seawater inundation of coastal acid sulfate soils (CASS) stimulates iron and sulfate reducing conditions, leading to the generation of internal alkalinity and greatly decreasing soil / groundwater acidity. This remediation technique can be considered highly effective from the relatively narrow perspective of decreasing acidity and raising pH. However, a broader perspective reveals that tidal seawater inundation initiates complex and tightly coupled hydrological and geochemical processes within sediments and porewaters. These processes have had a profound effect on the mobilisation, redistribution and transformation of Fe minerals in the landscape (Johnston et al., 2011a) – …