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Examination of sediment in the Derwent River by selective extraction


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Wuryatmo, Erminawati 1991 , 'Examination of sediment in the Derwent River by selective extraction', Coursework Master thesis, University of Tasmania.

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The distribution and bioavailability of zinc, lead, copper and cadmium in sediment
samples from the Derwent River has been examined by means of sequential selective
extraction. Two types of sediments; core sediment and surface sediments, were
used in the examination. They were taken from two sampling sites, one near the
Derwent Sailing Squadron and the other in Prince of Wales Bay.
The majority of the metals in the core sediment were in residual form and appeared
to be accumulated in the top part. By contrast, the metals in the surface sediment
were found mainly in the bioavailable (non-residual) forms. The core and surface
sediments had a different physical appearance and a different pH which may account
for in part the apparently anomalous results. The other explanation is that
sediments are parts of a dynamic system, and their ecotoxicological impact will be
different in different pH environments.
Compared to the total metals concentration measured in the previous studies
from similar sites, the results in this study indicated a decrease in the level of
the metals concentrations, except for mercury which showed a slight increase in
its level.

Item Type: Thesis - Coursework Master
Authors/Creators:Wuryatmo, Erminawati
Keywords: River sediments
Copyright Holders: The Author
Copyright Information:

Copyright 1991 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

Includes bibliographical references (p. 81-86). Thesis (M.Sc.St.)--University of Tasmania, 1992

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