Chemical characteristics of sediments and interstitial waters in some small Hawkesbury Sandstone freshwater streams of the Sydney area

Sediments of three streams draining sandstone catchments in Sydney, Australia, were sampled under low flow conditions over a 2‐year period. Two streams receive urban contaminants, one (the reference creek) has an undeveloped catchment. Levels of sediment copper, zinc, cadmium and lead (total and spe...

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Veröffentlicht in:Lakes & Reservoirs : Science, Policy and Management for Sustainable Use Policy and Management for Sustainable Use, 1998-09, Vol.3 (3-4), p.165-178
Hauptverfasser: Hayes, Warwick J., Buckney, Rodney T.
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description Sediments of three streams draining sandstone catchments in Sydney, Australia, were sampled under low flow conditions over a 2‐year period. Two streams receive urban contaminants, one (the reference creek) has an undeveloped catchment. Levels of sediment copper, zinc, cadmium and lead (total and speciated) and phosphorus (total and organic) were determined, as well as total organic carbon, particle size fractionation and cation exchange capacity. A range of quality parameters were also measured for interstitial waters. Sediments were characterized by very low organic matter (< 2% by weight) and low cation exchange capacity (< 3 mmol Na 100 g−1), due to high contents of coarse and fine sands (> 95%). Despite a low accumulation of heavy metals and phosphorus in the long term, the sediments were nevertheless a sink for these constituents. Greatest proportions of sediment zinc and lead were associated with hydrous metal oxide coatings, or coarse waste particles. Apart from a substantial residual component, copper was preferentially associated with organic matter. Cadmium was rarely detected in any stream. Multidimensional scaling showed that under low flow conditions the three sites had distinct sediment chemistries. However, high levels of temporal and spatial variability were apparent within the urbanized sites, consistent with those streams regularly receiving discharges of diverse composition. Poor sediment and interstitial water qualities were often observed in the two urban sites, although such conditions did not occur continuously. Poor interstitial water quality was also seen on occasion in the reference stream; however, poor sediment quality was never detected at this site. Considering surficial sediments of Hawkesbury Sandstone streams may be suspended during high flow conditions, it was concluded that surface waters were a more reliable indicator of stream condition for short‐term monitoring studies.
doi_str_mv 10.1046/j.1440-1770.1998.00070.x
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Multidimensional scaling showed that under low flow conditions the three sites had distinct sediment chemistries. However, high levels of temporal and spatial variability were apparent within the urbanized sites, consistent with those streams regularly receiving discharges of diverse composition. Poor sediment and interstitial water qualities were often observed in the two urban sites, although such conditions did not occur continuously. Poor interstitial water quality was also seen on occasion in the reference stream; however, poor sediment quality was never detected at this site. 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source Wiley Journals
subjects Australia, Sydney
Hawkesbury Sandstone
heavy metals
phosphorus
sediments
streams
Sydney
variability
title Chemical characteristics of sediments and interstitial waters in some small Hawkesbury Sandstone freshwater streams of the Sydney area
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