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Quantifying and characterising metal concentrations in Derwent Estuary sediments using portable X-ray fluorescence spectrometry

Hughes, S, Meffre, S ORCID: 0000-0003-2741-6076, Gregory, D and Chase, Z ORCID: 0000-0001-5060-779X 2022 , 'Quantifying and characterising metal concentrations in Derwent Estuary sediments using portable X-ray fluorescence spectrometry' , Australian Journal of Earth Sciences , pp. 1-15 , doi: 10.1080/08120099.2022.2037706.

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The Derwent Estuary is highly enriched in potentially toxic elements, such as Zn, Pb, Cu, As, Hg and Cd, owing to inputs from historical industrial activity adjacent to the river, predominantly prior to strict environmental protections introduced in the 1970s. Contaminants are now buried at shallow depths within the sediment profile, in one or two highly concentrated layers decreasing in concentration away from an electrolytic zinc refinery, regarded as the main source of the contaminants. Enriched metals (Zn, Pb, Cu, Cd and As) in the estuary were estimated from data collected from 37 sediment cores using a portable X-ray fluorescence spectrometer that was validated against inductively coupled plasma mass spectrometer analyses. The thickness of the metal and metalloid enriched layers ranges from 32.5 to 107.5 cm, with an average thickness of 63 cm. Sedimentation rates based on this layer and the time since the start of zinc processing are approximately 0.46 cm/year. Sedimentation rates based on the thickness since maximum metal and metalloid concentrations are between 0.17 and 1.64 cm/year. Based on these sedimentation rates, the average time it will take for surface sediments to return to background metal and metalloid concentrations, if left undisturbed, is approximately 123 years.

Item Type: Article
Authors/Creators:Hughes, S and Meffre, S and Gregory, D and Chase, Z
Keywords: Derwent, contamination, portable X-ray fluorescence, sediment, heavy metals, Derwent Estuary, Tasmania, contamination, sediment cores, sedimentation, rehabilitation time frame
Journal or Publication Title: Australian Journal of Earth Sciences
Publisher: Blackwell Publishing Asia
ISSN: 0812-0099
DOI / ID Number: 10.1080/08120099.2022.2037706
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Copyright 2022 Geological Society of Australia

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