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2009

Articles 1 - 9 of 9

Full-Text Articles in Earth Sciences

Geochemical Partitioning Of Copper, Lead And Zinc In Benthic, Estuarine Sediment Profiles, Edward Burton, Ian Phillips, Darryl Hawker Jul 2009

Geochemical Partitioning Of Copper, Lead And Zinc In Benthic, Estuarine Sediment Profiles, Edward Burton, Ian Phillips, Darryl Hawker

Associate Professor Edward D Burton

Received for publication May 11, 2004. The geochemical partitioning of copper (Cu), lead (Pb), and zinc (Zn) was examined in benthic sediment profiles (0- to 20-cm depth interval) composed of relatively coarse (65–90% sand-sized particles), noncohesive, suboxic material (Eh +120 to +260 mV). Total Cu, Pb, and Zn concentrations ranged from 8.3 to 194, 16.3 to 74.8, and 30.1 to 220 mg/kg, respectively, and were related to vertical trends in sediment texture. The observed distribution coefficients describing solid–solution partitioning were in the range of 100 to 1000 L/kg. The geochemical partitioning of solid-phase Cu, Pb, and Zn between six operationally …

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Reactive Sulphide Relationships With Trace Metal Extractability In Sediments From Southern Moreton Bay, Australia, Edward Burton, Ian Phillips, Darryl Hawker Jul 2009

Reactive Sulphide Relationships With Trace Metal Extractability In Sediments From Southern Moreton Bay, Australia, Edward Burton, Ian Phillips, Darryl Hawker

Associate Professor Edward D Burton

No abstract provided.

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Distribution And Enrichment Of Trace Metals In Benthic, Estuarine Sediments: Southport Broadwater, Australia, Edward Burton, Ian Phillips, Darryl Hawker Jul 2009

Distribution And Enrichment Of Trace Metals In Benthic, Estuarine Sediments: Southport Broadwater, Australia, Edward Burton, Ian Phillips, Darryl Hawker

Associate Professor Edward D Burton

The distribution and enrichment of selected trace metals (Cd, Cr, Cu, Ni, Pb, Sn, Zn) in benthic sediments of the Southport Broadwater, a semi-enclosed coastal body of water adjacent to the Gold Coast city, south-eastern Queensland, Australia, was studied with the objective of assessing the extent and degree of sediment contamination. Sediment samples from the 0–10 cm and 10–20 cm depth intervals of 32 sites within the Southport Broadwater and surrounding residential canals were analysed for particle size distribution, pH, organic C and ‘near-total’ major (Al, Ca, Fe, Mn) and trace (Cd, Cr, Cu, Ni, Pb, Sn, Zn) metal contents. …

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Nutrient Leaching In Undisturbed Cores Of An Acidic Sandy Podosol Following Simultaneous Potassium Chloride And Di-Ammonium Phosphate Application, Ian Phillips, Edward Burton Jul 2009

Nutrient Leaching In Undisturbed Cores Of An Acidic Sandy Podosol Following Simultaneous Potassium Chloride And Di-Ammonium Phosphate Application, Ian Phillips, Edward Burton

Associate Professor Edward D Burton

In south-east Queensland, Australia, extensive areas of sandy soils (Podosols) with shallow (<1>m) watertables are used for exotic pine tree production. Despite concerns that surface-applied fertilisers (di-ammonium phosphate (DAP) and potassium chloride (KCl)) may be contributing to a decline in local groundwater quality, published information on nutrient leaching in these Podosols is scarce. Large (0.3 m i.d. · 0.85 m long) undisturbed soil cores were intermittently leached with deionised water following a single surface application of KCl in combination with DAP. Potassium was applied at rates (equivalent on a surface area basis) of 0 (K0), 50 (K50), 100 (K100) …

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Copper Behaviour In A Podosol. Ii: Sorption Reversibility, Geochemical Partitioning And Column Leaching, Edward Burton, Ian Phillips, Darryl Hawker, Dane Lamb Jul 2009

Copper Behaviour In A Podosol. Ii: Sorption Reversibility, Geochemical Partitioning And Column Leaching, Edward Burton, Ian Phillips, Darryl Hawker, Dane Lamb

Associate Professor Edward D Burton

The sorption–desorption and leaching behaviour of Cu in a Podosol from south-east Queensland, Australia, was examined. Copper sorption was described by a linear distribution coefficient at low sorption levels (KDCa→0) of 481 L/kg and a sorption capacity (CS,Max) of 382 mg/kg. Selective removal of soil organic matter reduced these values by approximately 95%, indicating that Cu was sorbed predominantly to soil organic matter. The KDCa→0 and CS,Max values from Cu desorption experiments were 934 L/kg and 516 mg/kg, respectively, which indicates that sorption was not fully reversible. This irreversibility was related to …

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Copper Behaviour In A Podosol. I: Ph-Dependent Sorption-Desorption, Sorption Isotherm Analysis And Aqueous Speciation Modelling, Edward Burton, Ian Phillips, Darryl Hawker, Dane Lamb Jul 2009

Copper Behaviour In A Podosol. I: Ph-Dependent Sorption-Desorption, Sorption Isotherm Analysis And Aqueous Speciation Modelling, Edward Burton, Ian Phillips, Darryl Hawker, Dane Lamb

Associate Professor Edward D Burton

The effects of pH and Cu loading on the solid/solution partitioning of Cu in a Podosol from south-east Queensland, Australia was examined. Sorption–desorption of Cu exhibited maximum linear distribution coefficients (KD) at approximately pH 5. Observed decrease in KD values at pH >5 was attributed to increased solubility of native dissolved organic carbon (DOC) at higher pH and subsequent formation of non-sorbing Cu–DOC complexes. Speciation modelling with the MINTEQA2 code indicated that >90% of aqueous Cu was present as Cu–DOC complexes at pH >5.5. The effect of Cu loading was examined with sorption isotherm analysis at pH …

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Mountain Building Across A Lithospheric Boundary During Arc Construction: The Cretaceous Peninsular Ranges Batholith In The Sierra San Pedro Martir Of Baja California, Mexico, K Schmidt, S Paterson, Ann Blythe, C Kopf Apr 2009

Mountain Building Across A Lithospheric Boundary During Arc Construction: The Cretaceous Peninsular Ranges Batholith In The Sierra San Pedro Martir Of Baja California, Mexico, K Schmidt, S Paterson, Ann Blythe, C Kopf

Ann Blythe

The Jura-Cretaceous Peninsular Ranges batholith (PRB) of Southern and Baja California contains a remarkable example of variation in crustal composition and structure across a batholith-parallel lithospheric-scale discontinuity. This lithospheric boundary between western oceanic-floored and eastern continental-floored crust influenced contractional deformation, arc magmatism, and differential exhumation of western and eastern zones in the batholith during its evolution. In the Sierra San Pedro Martir of Baja California, Mexico, a ca. 20 km wide, doubly vergent fan structure occurs across the PRB basement transition that consists of inward-dipping mylonite thrust sheets on the sides of the fan that gradually transition to a steeply-dipping …

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Agenda For A Sustainable America, John Dernbach Dec 2008

Agenda For A Sustainable America, John Dernbach

John C. Dernbach

No abstract provided.

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An Agenda For Sustainable Communities, John Dernbach Dec 2008

An Agenda For Sustainable Communities, John Dernbach

John C. Dernbach

This article summarizes progress toward sustainable communities in the United States since the United Nations Conference on Environment and Development (or Earth Summit) in 1992. It shows the significant initiative that many communities have undertaken and identifies existing state and federal laws as impediments to achieving sustainability. This article also makes recommendations for further progress based on what we have already learned about how to achieve sustainable communities. They include not only more and strengthened sustainable community efforts, and broad state and federal legal support, but also deep engagement of all affected citizens. This article is based primarily on three …

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