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Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Institution
- Keyword
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- Oceanography (9)
- Sediment Transport (7)
- Chromium reducible sulfur (6)
- Circulation (6)
- Pyrite oxidation (5)
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- Jarosite (4)
- Scientific Magazine Articles (4)
- Soil incubation (4)
- Acidification (3)
- Caves and Karst (3)
- Climate change (3)
- Geochemistry and Climatology (3)
- Geomorphology (3)
- Hydrogeology (3)
- Pyrite (3)
- Recent publications (3)
- Sea level rise (3)
- Acid-volatile sulfide (2)
- Appendix B: Geophysical Data (2)
- Biospeleology (2)
- Biostratigraphy (2)
- Classification (2)
- Conservation (2)
- Creationism (2)
- Desorption (2)
- Dissolved sulfide (2)
- Elemental sulfur (2)
- Geographe Bay (2)
- Geology (2)
- Karst (2)
- Publication
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- Dr Nicholas J Ward (56)
- Associate Professor Edward D Burton (29)
- Dr Zhaohui Wang (21)
- George Voulgaris (16)
- S Isiorho (13)
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- Peter Dahl (5)
- Adjunct Professor Richard T Bush (4)
- Caleb Holyoke (4)
- Christopher N. Roman (4)
- Jean Taylor Ellis (4)
- Jeffrey Parr (4)
- Cianna E Wyshnytzky (3)
- David J Richey (3)
- John Craddock (3)
- Lee J Florea, PhD, P.G. (3)
- Przemysław Kupidura (3)
- Rebecca Bendick (3)
- Alexandra M Simpson (2)
- Alison Smith (2)
- Ana Sofia P.S. Reboleira (2)
- Barry A. Palynchuk PhD (2)
- Eric Wade Peterson (2)
- Louisa I. Bradtmiller (2)
- Marcus R. Ross (2)
- Natalie Bursztyn (2)
- Andrew Jochems (1)
- Andy VanLoocke (1)
- Ann Blythe (1)
- Benjamin F. Dattilo (1)
- Charles Dunlap (1)
Articles 61 - 90 of 222
Full-Text Articles in Physical Sciences and Mathematics
Lower Lakes Sulfate Reduction Study, Leigh Sullivan, Edward Burton, Nicholas Ward, Richard Bush, J Coughran, Michael Cheetham, Diane Fyfe, Paul Cheeseman, Trent Mcintyre
Lower Lakes Sulfate Reduction Study, Leigh Sullivan, Edward Burton, Nicholas Ward, Richard Bush, J Coughran, Michael Cheetham, Diane Fyfe, Paul Cheeseman, Trent Mcintyre
Dr Nicholas J Ward
No abstract provided.
Assessment Of Acid Sulfate Soil Materials (Phase 2): Brickworks Lagoon, Nicholas J. Ward, Richard T. Bush, Leigh A. Sullivan, J Coughran, Diane M. Fyfe
Assessment Of Acid Sulfate Soil Materials (Phase 2): Brickworks Lagoon, Nicholas J. Ward, Richard T. Bush, Leigh A. Sullivan, J Coughran, Diane M. Fyfe
Dr Nicholas J Ward
No abstract provided.
Assessment Of Acid Sulfate Soil Materials (Phase 2): Boeill Creek/Lagoon Wetland Complex, Nicholas J. Ward, Richard T. Bush, Leigh A. Sullivan, J Coughran, Diane M. Fyfe
Assessment Of Acid Sulfate Soil Materials (Phase 2): Boeill Creek/Lagoon Wetland Complex, Nicholas J. Ward, Richard T. Bush, Leigh A. Sullivan, J Coughran, Diane M. Fyfe
Dr Nicholas J Ward
No abstract provided.
Distribution And Hazard Of Sulfidic Sediments In A River And Creek Channel System Of The Murray-Darling Basin: Edward-Wakool Channel System Case Study, Richard T. Bush, M Tulau, J Coughran, Nicholas J. Ward, Vanessa Nl Wong, Michael D. Cheetham, David Morand
Distribution And Hazard Of Sulfidic Sediments In A River And Creek Channel System Of The Murray-Darling Basin: Edward-Wakool Channel System Case Study, Richard T. Bush, M Tulau, J Coughran, Nicholas J. Ward, Vanessa Nl Wong, Michael D. Cheetham, David Morand
Dr Nicholas J Ward
No abstract provided.
Assessment Of Acid Sulfate Soil Materials (Phase 2): Edward-Wakool Channel System, Nicholas J. Ward, Richard T. Bush, Leigh A. Sullivan, J Coughran, Diane M. Fyfe
Assessment Of Acid Sulfate Soil Materials (Phase 2): Edward-Wakool Channel System, Nicholas J. Ward, Richard T. Bush, Leigh A. Sullivan, J Coughran, Diane M. Fyfe
Dr Nicholas J Ward
No abstract provided.
Annual Surface And Groundwater Contaminant Monitoring Program, Wyrallah Road Waste Facility, Lismore (2010-2011), Nicholas Ward, Troy Shepherd, Graham Lancaster
Annual Surface And Groundwater Contaminant Monitoring Program, Wyrallah Road Waste Facility, Lismore (2010-2011), Nicholas Ward, Troy Shepherd, Graham Lancaster
Dr Nicholas J Ward
No abstract provided.
Assessment Of Acid Sulfate Soil Materials (Phase 2): Glen Esk-Rusty Waterhole, Nicholas J. Ward, Richard T. Bush, Leigh A. Sullivan, J Coughran, Diane M. Fyfe
Assessment Of Acid Sulfate Soil Materials (Phase 2): Glen Esk-Rusty Waterhole, Nicholas J. Ward, Richard T. Bush, Leigh A. Sullivan, J Coughran, Diane M. Fyfe
Dr Nicholas J Ward
No abstract provided.
Preliminary Acid Sulfate Soil Assessment Report For Proposed Sixteen Cabin Tourist Development At Lot 495 Dp755624, Beech Street, Evans Head, Nsw, Nicholas Ward, Troy Shepherd, N Davison
Preliminary Acid Sulfate Soil Assessment Report For Proposed Sixteen Cabin Tourist Development At Lot 495 Dp755624, Beech Street, Evans Head, Nsw, Nicholas Ward, Troy Shepherd, N Davison
Dr Nicholas J Ward
No abstract provided.
Preliminary Acid Sulfate Soil Assessment Report For Proposed Swimming Pool At Lot 70 Dp772011, 36 Belongil Crescent, Byron Bay, Nicholas Ward, Troy Shepherd, N Davison
Preliminary Acid Sulfate Soil Assessment Report For Proposed Swimming Pool At Lot 70 Dp772011, 36 Belongil Crescent, Byron Bay, Nicholas Ward, Troy Shepherd, N Davison
Dr Nicholas J Ward
No abstract provided.
Lower Lakes Acid Sulfate Soil Detailed Conceptual Model Project, Leigh Sullivan, Nicholas Ward
Lower Lakes Acid Sulfate Soil Detailed Conceptual Model Project, Leigh Sullivan, Nicholas Ward
Dr Nicholas J Ward
No abstract provided.
Lower Lakes Phase 1 Sulfate Reduction Monitoring Project, Leigh Sullivan, Nicholas Ward, Richard Bush, Michael Cheetham, Paul Cheeseman, Diane Fyfe, Trent Mcintyre, Michelle Bush, Roslyn Hagan
Lower Lakes Phase 1 Sulfate Reduction Monitoring Project, Leigh Sullivan, Nicholas Ward, Richard Bush, Michael Cheetham, Paul Cheeseman, Diane Fyfe, Trent Mcintyre, Michelle Bush, Roslyn Hagan
Dr Nicholas J Ward
No abstract provided.
One Tree Reach Wetland Acid Sulfate Soil Restoration Project: Monitoring Protocol, Nicholas Ward
One Tree Reach Wetland Acid Sulfate Soil Restoration Project: Monitoring Protocol, Nicholas Ward
Dr Nicholas J Ward
No abstract provided.
Long Term Acid Sulfate Soil Management Investigation: Floodway Structure Excavation At Cox's Bridge Realignment Project, Sale, Victoria, N Davison, Nicholas Ward
Long Term Acid Sulfate Soil Management Investigation: Floodway Structure Excavation At Cox's Bridge Realignment Project, Sale, Victoria, N Davison, Nicholas Ward
Dr Nicholas J Ward
No abstract provided.
Annual Surface And Groundwater Contaminant Monitoring Program, Nicholas Ward, Troy Shepherd, Katie Whitney, Graham Lancaster
Annual Surface And Groundwater Contaminant Monitoring Program, Nicholas Ward, Troy Shepherd, Katie Whitney, Graham Lancaster
Dr Nicholas J Ward
No abstract provided.
Sample Pre-Treatment And The Determination Of Some Chemical Properties Of Acid Sulfate Soil Materials, Crystal Maher, Leigh Sullivan, Nicholas Ward
Sample Pre-Treatment And The Determination Of Some Chemical Properties Of Acid Sulfate Soil Materials, Crystal Maher, Leigh Sullivan, Nicholas Ward
Dr Nicholas J Ward
This study provides a systematic analysis of the effect of common acid sulfate soil (ASS) sample pre-treatments (namely freezing, oven drying, and grinding) on chromium-reducible sulfur (SCR) and water-soluble sulfate determinations. The results show that oven drying and hand grinding of the samples prior to analysis resulted in a decrease in SCR (i.e. up to 20% compared to those of frozen samples). This lower SCR value was partly due to the oxidation of sulfides in the oven. For oven-dried ASS materials, more intensive grinding in a ring mill increased SCR values, most likely by abrading coatings from pyrite grains. For …
Monosulfidic Sediments In The Wakool River, Southern Australia: A Preliminary Investigation, Michael Cheetham, Vanessa Wong, Richard Bush, Leigh Sullivan, Nicholas Ward
Monosulfidic Sediments In The Wakool River, Southern Australia: A Preliminary Investigation, Michael Cheetham, Vanessa Wong, Richard Bush, Leigh Sullivan, Nicholas Ward
Dr Nicholas J Ward
No abstract provided.
Disulfide Sulfur (Sd), Leigh Sullivan, Angus Mcelnea, Nicholas Ward, Richard Bush
Disulfide Sulfur (Sd), Leigh Sullivan, Angus Mcelnea, Nicholas Ward, Richard Bush
Dr Nicholas J Ward
No abstract provided.
The Response Of Partially Oxidised Acid Sulfate Soil Materials To Anoxia, Nicholas Ward, Leigh Sullivan, Richard Bush
The Response Of Partially Oxidised Acid Sulfate Soil Materials To Anoxia, Nicholas Ward, Leigh Sullivan, Richard Bush
Dr Nicholas J Ward
Four acid sulfate soil (ASS) materials were subjected to anoxia after varying periods of oxidation to determine the geochemical response of these types of soils to flooding. The response of the partially oxidised ASS materials to the exclusion of oxygen was variable. The rate of sulfide oxidation, acidification, and the production of soluble oxidation products such as sulfate, iron, and aluminium generally decreased markedly when subjected to anoxia. However, especially in the highly acidic ASS materials (i.e. pH 3+. Rapid sulfide re-formation occurred in the peat ASS material that had been oxidised for 63 days, with 0.47% reduced inorganic sulfur …
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 …
Sulfide Oxidation And Acidification Of Acid Sulfate Soil Materials Treated With Caco3 And Seawater-Neutralised Bauxite Refinery Residue, Nicholas Ward, Leigh Sullivan, Richard Bush
Sulfide Oxidation And Acidification Of Acid Sulfate Soil Materials Treated With Caco3 And Seawater-Neutralised Bauxite Refinery Residue, Nicholas Ward, Leigh Sullivan, Richard Bush
Dr Nicholas J Ward
Acid sulfate soil (ASS) materials that are subject to oxidation are often treated with neutralising agents to minimise the export of acidity that may result from pyrite oxidation. The effects of additions of both CaCO3 and seawater-neutralised bauxite refinery residue (SNBRR) on the oxidation of sulfides and acidification were assessed for 4 ASS materials using laboratory incubation experiments. As the application of sub-optimal rates of neutralising materials can occur for a variety of reasons, the effect of application rates were also examined. Two application rates were chosen; a sub-optimal rate [approximately 20% of the theoretical neutralising requirement (NR)] and …
Elemental Sulfur (Se), Nicholas Ward, Diane Fyfe, Leigh Sullivan, S Claff, Richard Bush
Elemental Sulfur (Se), Nicholas Ward, Diane Fyfe, Leigh Sullivan, S Claff, Richard Bush
Dr Nicholas J Ward
No abstract provided.
Assessment Of Peroxide Oxidation For Acid Sulfate Soil Analysis. 2. Acidity Determination, Nicholas Ward, Leigh Sullivan, Richard Bush, Chuxia Lin
Assessment Of Peroxide Oxidation For Acid Sulfate Soil Analysis. 2. Acidity Determination, Nicholas Ward, Leigh Sullivan, Richard Bush, Chuxia Lin
Dr Nicholas J Ward
Total sulfidic acidity (TSA) and total potential acidity (TPA) are derived from peroxide oxidation of acid sulfate soil materials (ASS), and are measures of the sulfidic acidity and the net acidity (net acidity = sulfidic acidity + actual acidity – acid neutralising capacity), respectively. The TSA and TPA of 4 ASS materials were determined using a variety of peroxide oxidation procedures and compared with the sulfidic acidity and net acidity derived from the use of an acid–base accounting model. TSA and TPA values both varied greatly with each peroxide oxidation method used, and both measures were found to substantially underestimate …
Monosulfidic Black Ooze Accumulations In Sediments Of The Geographe Bay Area, Western Australia, Nicholas Ward, Richard Bush, Edward Burton, S Appleyard, S Wong, Leigh Sullivan, Paul Cheeseman
Monosulfidic Black Ooze Accumulations In Sediments Of The Geographe Bay Area, Western Australia, Nicholas Ward, Richard Bush, Edward Burton, S Appleyard, S Wong, Leigh Sullivan, Paul Cheeseman
Dr Nicholas J Ward
Mobilisation of sedimentary monosulfidic black ooze (MBO) may result in rapid deoxygenation and acidification of surface waters, and release of potentially toxic metals. This study examines the extent and nature of MBO accumulation in the Geographe Bay area, Western Australia. MBO accumulations were found to be widespread in benthic sediments of the Geographe Bay area with acid-volatile sulfide (AVS) contents as high as 320 μmol g−1. The MBO materials often had unusually high dissolved sulfide (S−II) concentrations in their pore-waters (up to 610 mg L−1) and elevated elemental sulfur (S0) contents (up to 51 μmol g−1). Dissolved S−II is able …
Improved Identification Of Sulfidic Soil Materials By A Modified Incubation Method, Leigh Sullivan, Nicholas Ward, Richard Bush, Edward Burton
Improved Identification Of Sulfidic Soil Materials By A Modified Incubation Method, Leigh Sullivan, Nicholas Ward, Richard Bush, Edward Burton
Dr Nicholas J Ward
This study examines the acidification behaviour and rate of sulfidic-sulfur oxidation in the incubation method that is currently used in soil taxonomies to identify sulfidic materials, for some clayey textured soil materials. ‘Sulfidic’ in these taxonomies identifies that a soil material is capable of becoming extremely acidic (i.e. pH < 4) as a result of oxidation of sulfide minerals contained in that soil material. As well as examining incubation slabs of acid sulfate soil materials with the standard 10 mm thickness, the utility of thinner (i.e. 2 mm thick) incubation slabs of these soil materials for identification of sulfidic soil materials …
Sulfide Oxidation In Some Acid Sulfate Soil Materials, Nicholas John Ward
Sulfide Oxidation In Some Acid Sulfate Soil Materials, Nicholas John Ward
Dr Nicholas J Ward
This thesis examines sulfide oxidation in 4 physically and mineralogically diverse acid sulfate soil (ASS) materials collected from coastal floodplain sites in north-eastern New South Wales. The aim of this study is to gain further understanding of the process of sulfide oxidation in ASS materials, which will allow improved and more effective management strategies to be applied to these materials. The process of sulfide oxidation was examined using laboratory incubation experiments. The oxidation of pyrite was the primary cause of initial acidification of the ASS materials studied. Although the acid volatile sulfur fraction increased in concentration by an order of …
Chromium Reducible Sulphur For Acid Sulphate Soil Identification And Management, Leigh Sullivan, Nicholas Ward, Richard Bush, Chuxia Lin
Chromium Reducible Sulphur For Acid Sulphate Soil Identification And Management, Leigh Sullivan, Nicholas Ward, Richard Bush, Chuxia Lin
Dr Nicholas J Ward
No abstract provided.
Soil Ph, Oxygen Availability, And The Rate Of Sulfide Oxidation In Acid Sulfate Soil Materials: Implications For Environmental Hazard Assessment, Nicholas Ward, Leigh Sullivan, Richard Bush
Soil Ph, Oxygen Availability, And The Rate Of Sulfide Oxidation In Acid Sulfate Soil Materials: Implications For Environmental Hazard Assessment, Nicholas Ward, Leigh Sullivan, Richard Bush
Dr Nicholas J Ward
The potential environmental hazard of acid sulfate soil (ASS) materials is directly related to both the net acidity and the rate that actual acidity is released from these soil materials into the environment. While current environmental hazard assessment techniques for ASS materials are able to quantify the net acidity, they do not take account of differences in the rate of sulfide oxidation (the dominant source of actual acidity) and differences in the rate of acidification. In this study the rate of sulfide oxidation during incubation was examined for 4 ASS materials. The effect of pH and oxygen availability on the …
The Process Of Sulfide Oxidation In Some Acid Sulfate Soil Materials, Nicholas Ward, Leigh Sullivan, Diane Fyfe, Richard Bush, Angus Ferguson
The Process Of Sulfide Oxidation In Some Acid Sulfate Soil Materials, Nicholas Ward, Leigh Sullivan, Diane Fyfe, Richard Bush, Angus Ferguson
Dr Nicholas J Ward
The process of sulfide oxidation in acid sulfate soils (ASS) is complex, involving the formation of numerous oxidation products. In this study the sulfide oxidation process was examined in 2 ASS materials over a period of 36 days using laboratory incubation experiments. Both ASS materials experienced substantial sulfide oxidation and acidification during incubation. The oxidation of pyrite was the primary cause of acidification in these ASS materials. Although a decrease in magnetic susceptibility (χ) over the initial 4 days of incubation suggested the rapid oxidation of ferromagnetic iron monosulfide greigite (Fe3S4), the total acid volatile sulfur …
Assessment Of Peroxide Oxidation For Acid Sulfate Soil Analysis. 1. Reduced Inorganic Sulfur, Nicholas Ward, Leigh Sullivan, Richard Bush, Chuxia Lin
Assessment Of Peroxide Oxidation For Acid Sulfate Soil Analysis. 1. Reduced Inorganic Sulfur, Nicholas Ward, Leigh Sullivan, Richard Bush, Chuxia Lin
Dr Nicholas J Ward
The reduced inorganic sulfur fraction of 4 acid sulfate soil (ASS) materials was quantified using a variety of peroxide oxidation procedures. The temperature and duration of the peroxide oxidation were found to markedly affect the peroxide oxidisable sulfur determination. For 3 ASS materials with low total carbon content (i.e. <2.5% C), peroxide oxidisable sulfur underestimated the reduced inorganic sulfur fraction, with the peroxide oxidisable sulfur determinations being as low as 42% of those determined using chromium reducible sulfur technique. The precipitation of jarosite during peroxide oxidation was a major factor contributing to the underestimation of reduced inorganic sulfur in these materials. Apparent losses of sulfur of approximately 25% on average occurred during peroxide oxidation budget accounting; this also contributed towards the observed underestimation of reduced inorganic sulfur. It is most likely that these unaccounted losses are due to atmospheric losses of sulfur. In a peat ASS, one of the peroxide oxidation methods overestimated the reduced inorganic sulfur fraction and was attributed to the release of a large reserve of organic sulfur in this material by the peroxide. This study shows the peroxide oxidation methods examined here are subject to substantial interferences. Consequently these peroxide oxidation methods are unable to reliably provide accurate measurements of the reduced inorganic sulfur fraction in ASS materials
Limits Of Luminescence Dating: An Update Regarding Quartz Of The Southern Alps Of New Zealand And The Olympic Mountains, Washington, Usa, Cianna Wyshnytzky, Tammy Rittenour
Limits Of Luminescence Dating: An Update Regarding Quartz Of The Southern Alps Of New Zealand And The Olympic Mountains, Washington, Usa, Cianna Wyshnytzky, Tammy Rittenour
Cianna E Wyshnytzky
Late Pleistocene glacial sediments from the South Fork Hoh River valley in the Olympic Mountains, Washington, USA and the Lake Hawea valley in the Southern Alps, New Zealand were dated using optically stimulated luminescence (OSL) on quartz and infrared stimulated luminescence (IRSL) on feldspar sand from 2011-2013. High sediment supply (typical of glacial environments), short transport distances, and sediment newly eroded from bedrock sources were expected to pose problems for luminescence dating in these locations. Samples were collected from a variety of depositional environments and inferred distances from the ice-front to assess how luminescence signals may vary due to these …