ORCID Profile
0000-0002-6884-9196
Current Organisation
Rio Tinto
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Elsevier
Date: 2003
Publisher: CSIRO Publishing
Date: 2006
DOI: 10.1071/EN05055
Abstract: Environmental Context. Acid sulfate soils are found in many low-lying coastal areas, but they can also be encountered in inland areas of Australia and other parts of the world. These soils typically contain iron sulfides, primarily pyrite (FeS2) and mackinawite (FeS), and the products that result from oxidation of these iron minerals. Acidic and metal-rich waters can be produced when the pyrite in soil is oxidized by natural means or accelerated when the soil is drained, which typically occurs when it is developed for agriculture or urban use. In general, acid sulfate soils become a problem when oxidation products are transported from the soil profile into nearby streams and estuaries, which can severely affect the ecology, bio ersity, economic development, and the aesthetics of adjacent waterways. The key contributors to acidity in drainage waters from the site examined are Al3+, AlSO4– and, under particular circumstances, Mn2+ and Fe2+, but the principal species contributing to acidity are strongly time variant and would be expected to vary from site to site. Abstract. Catchments that contain acid sulfate soils can discharge large quantities of acid and dissolved metals into waterways. At McLeods Creek in far northern NSW, Australia, the acidity from the hydrolysis of dissolved metal species, particularly aluminium and iron, contributes to greater than 70% of the total acidity. Therefore, a poor relationship exists between both calculated and titrated acidity and pH because of the dominant influence of these hydrolyzable metal species. Determination of the so-called ‘cold acidity’ by direct titration with NaOH yields results that are difficult to replicate because of the buffering effects of suspended solids, carbon dioxide ingassing, and/or MnII and FeII oxidation in the s le as the titration end-point is approached. S les that are pre-treated with sulfuric acid and hydrogen peroxide produce results (of ‘hot acidity’) that can be easily replicated and are similar to calculated acidities based on elemental analysis and speciation calculations. The cold acidity values for titrations of 105 water s les from the chosen field site are often higher than hot acidity values as a result of the loss of carbonate acidity during pre-treatment of s les for hot acidity analysis.
Publisher: Informa UK Limited
Date: 09-2009
Publisher: Springer Science and Business Media LLC
Date: 13-06-2006
Publisher: InTech
Date: 23-08-2011
DOI: 10.5772/20473
Publisher: Springer Science and Business Media LLC
Date: 29-01-2008
Publisher: Springer Science and Business Media LLC
Date: 31-01-2008
Publisher: Elsevier BV
Date: 06-2006
No related grants have been discovered for Ros Green.