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Your search keyword '"Harrison, Jennifer J."' showing total 33 results
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33 results on '"Harrison, Jennifer J."'

19. How significant is atmospheric metal contamination from mining activity adjacent to the Tasmanian Wilderness World Heritage Area? A spatial analysis of metal concentrations using air trajectories models

Author

Michael-Shawn Fletcher Atun Zawadzki Henk Heijnis Simon G. Haberle, Jennifer J. Harrison, Schneider, Larissa, Mariani, Michela, Saunders, Krystyna M., Maher, William A., Harrison, Jennifer J., Fletcher, Michael-Shawn, Zawadzki, Atun, Heijnis, Henk, and Haberle, Simon G.

Subjects
Environmental Engineering, Environmental Chemistry, Waste Management and Disposal, Pollution
Abstract

This study investigated metal contamination from historical mining in lakes in the Tasmanian Wilderness World Heritage Area (TWWHA) and surrounding region. The largest increase in sedimentation and metal contamination occurred ca. 1930 when open-cut mining commenced and new mining technology was introduced into the region. The geochemical signal of lake sediments changed from reflecting the underlying geology and lithology to that reflecting mining activities. The HYSPLIT air particle trajectory model explains metal distribution in the lakes, with those in the northwest region closest to the mines having the highest metal contamination. Lake metal concentrations since mining activities commenced are in the order: Owen Tarn?>?Basin Lake?>?Perched Lake?>?Lake Dove?>?Lake Dobson?>?Lake Cygnus, with Perched Lake and Lakes Dove, Dobson and Cygnus in the TWWHA. Metal contamination affected centres up to 130?km down-wind of mining sites. Enrichment factors (EF) for Pb, Cu, As and Cd are >1 for all lakes, with Owen Tarn and Basin Lake having very high EFs for Cu and Pb (98 and 91, respectively). Pb, Cu, As and Cd concentrations are above the Australia/New Zealand lower sediment guidelines, with Pb, Cu and As above the high guidelines in Owen Tarn and Basin Lake. This study demonstrated the legacy of metal contamination in the TWWHA by mining activities and the consequences of a lack of execution of environmental regulations by past governments in Tasmania.

Published
2019

23. Phosphorus Fate and Dynamics in Greywater Biofiltration Systems

Author

Fowdar, Harsha S., Hatt, Belinda E., Cresswell, Tom, Harrison, Jennifer J., Cook, Perran L.M., Deletic, Ana, Fowdar, Harsha S., Hatt, Belinda E., Cresswell, Tom, Harrison, Jennifer J., Cook, Perran L.M., and Deletic, Ana

Abstract

Phosphorus, a critical environmental pollutant, is effectively removed from stormwater by biofiltration systems, mainly via sedimentation and straining. However, the fate of dissolved inflow phosphorus concentrations in these systems is unknown. Given the growing interest in using biofiltration systems to treat other polluted waters, for example greywater, such an understanding is imperative to optimize designs for successful long-term performance. A mass balance method and a radiotracer, 32P (as H3PO4), were used to investigate the partitioning of phosphorus (concentrations of 2.5-3.5 mg/L, >80% was in dissolved inorganic form) between the various biofilter components at the laboratory scale. Planted columns maintained a phosphorus removal efficiency of >95% over the 15-week study period. Plant storage was found to be the dominant phosphorus sink (64% on average). Approximately 60% of the phosphorus retained in the filter media was recovered in the top 0-6 cm. The 32P tracer results indicate that adsorption is the immediate primary fate of dissolved phosphorus in the system (up to 57% of input P). Plant assimilation occurs at other times, potentially liberating sorption sites for processing of subsequent incoming phosphorus. Plants with high nutrient uptake capacities and the ability to efficiently extract soil phosphorus, for example Carex appressa, are, thus, recommended for use in greywater biofilters.

Published
2017

25. Measurement of fallout radionuclides, 239 ,240Pu and 137Cs, in soil and creek sediment: Sydney Basin, Australia

Author

Smith, Brodie S, Child, D, Fierro, D, Harrison, Jennifer J, Heijnis, Henk, Hotchkis, M, Johansen, M, Marx, Samuel K, Payne, T, Zawadzki, Atun, Smith, Brodie S, Child, D, Fierro, D, Harrison, Jennifer J, Heijnis, Henk, Hotchkis, M, Johansen, M, Marx, Samuel K, Payne, T, and Zawadzki, Atun

Abstract

Soil and sediment samples from the Sydney basin were measured to ascertain fallout radionuclide activity concentrations and atom ratios. Caesium-137 (137Cs) was measured using gamma spectroscopy, and plutonium isotopes (239Pu and 240Pu) were quantified using accelerator mass spectrometry (AMS). Fallout radionuclide activity concentrations were variable ranging from 0.6 to 26.1 Bq/kg for 137Cs and 0.02-0.52 Bq/kg for 239+240Pu. Radionuclides in creek sediment samples were an order of magnitude lower than in soils. 137Cs and 239+240Pu activity concentration in soils were well correlated (r2 = 0.80) although some deviation was observed in samples collected at higher elevations. Soil ratios of 137Cs/239+240Pu (decay corrected to 1/1/2014) ranged from 11.5 to 52.1 (average = 37.0 ± 12.4) and showed more variability than previous studies. 240Pu/239Pu atom ratios ranged from 0.117 to 0.165 with an average of 0.146 (±0.013) and an error weighted mean of 0.138 (±0.001). These ratios are lower than a previously reported ratio for Sydney, and lower than the global average. However, these ratios are similar to those reported for other sites within Australia that are located away from former weapons testing sites and indicate that atom ratio measurements from other parts of the world are unlikely to be applicable to the Australian context.

Published
2016

26. Influence of Dissolved Silicate on Rates of Fe(II) Oxidation

Author

Kinsela, Andrew S., primary, Jones, Adele M., additional, Bligh, Mark W., additional, Pham, An Ninh, additional, Collins, Richard N., additional, Harrison, Jennifer J., additional, Wilsher, Kerry L., additional, Payne, Timothy E., additional, and Waite, T. David, additional

Published
2016
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31. Generic Immunosuppression in Solid Organ Transplantation

Author

Harrison, Jennifer J., primary, Schiff, Jeffrey R., additional, Coursol, Christian J., additional, Daley, Christopher J.A., additional, Dipchand, Anne I., additional, Heywood, Norine M., additional, Keough-Ryan, Tammy M., additional, Keown, Paul A., additional, Levy, Gary A., additional, Lien, Dale C., additional, Wichart, Jenny R., additional, and Cantarovich, Marcelo, additional

Published
2012
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