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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/7901

Title: Recent history of sediment metal contamination in Lake Macquarie, Australia, and an assessment of ash handling procedure effectiveness in mitigating metal contamination from coal-fired power stations
Authors: Schneider, L
Maher, W
Potts, J
Gruber, B
Batley, G
Taylor, A
Chariton, A
Krikowa, F
Zawadzki, A
Heijnis, H
Keywords: COAL
POWER SYSTEMS
SEDIMENTS
METALS
SELENIUM
ASHES
Issue Date: 15-Aug-2014
Publisher: Elsevier
Citation: Schneider, L., Maher, W., Potts, J., Gruber, B., Batley, G., Taylor, A., . . . Heijnis, H. (2014). Recent history of sediment metal contamination in Lake Macquarie, Australia, and an assessment of ash handling procedure effectiveness in mitigating metal contamination from coal-fired power stations. Science of the Total Environment, 490, 659-670. doi: http://dx.doi.org/10.1016/j.scitotenv.2014.04.055
Abstract: This study assessed historical changes in metal concentrations in sediments of southern Lake Macquarie resulting from the activities of coal-fired power stations, using a multi-proxy approach which combines 210Pb, 137Cs and metal concentrations in sediment cores. Metal concentrations in the lake were on average, Zn: 67 mg/kg, Cu: 15 mg/kg, As: 8 mg/kg, Se: 2 mg/kg, Cd: 1.5 mg/kg, Pb: 8 mg/kg with a maximum of Zn: 280 mg/kg, Cu: 80 mg/kg, As: 21 mg/kg, Se: 5 mg/kg, Cd: 4 mg/kg, Pb: 48 mg/kg. The ratios of measured concentrations in sediment cores to their sediment guidelines were Cd 1.8, As 1.0, Cu 0.5, Pb 0.2 and Zn 0.2, with the highest concern being for cadmium. Of special interest was assessment of the effects of changes in ash handling procedures by the Vales Point power station on the metal concentrations in the sediments. Comparing sediment layers before and after ash handling procedures were implemented, zinc concentrations have decreased 10%, arsenic 37%, selenium 20%, cadmium 38% and lead 14%. An analysis of contaminant depth profiles showed that, after implementation of new ash handling procedures in 1995, selenium and cadmium, the main contaminants in Australian black coal had decreased significantly in this estuary. © 2014, Elsevier B.V.
URI: http://dx.doi.org/10.1016/j.scitotenv.2014.04.055
http://apo.ansto.gov.au/dspace/handle/10238/7901
ISSN: 0048-9697
Appears in Collections:Journal Articles

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