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Spatial variation of sediment-bound zinc, lead, copper and rubidium in Lake Illawarra, a coastal lagoon in eastern Australia
Forty sites in Lake Illawarra, a shallow(< 3.7 m) almost landlocked, New South Wales coastal lagoon, were investigated by sediment coring to provide a comprehensive reappraisal of sediment-bound, background (pre-industrial) and polluted trace metal concentrations together with organic matter concentrations and direct (on-vessel) determination of pH, redox potential and temperature. The distribution of Zn, Pb and Cu in the upper 20 cm of sediment is directly related to the proportion of mud-dominated sediment, organic matter content and input from local industrial sources. Alkaline (pH >7.6), reducing (redox potential <-50 mV) conditions, 5 cm below the water-sediment interface, high organic matter content (mean 14.0 ± 2.1 % in muddy substrates) and biogenic processes (bacterially-mediated sulfate reduction) in Lake Illawarra facilitate Zn, Pb and Cu retention via sulfide formation in the sediment. Trace metal enrichment factors for sediment-bound Zn, Pb and Cu were less than 2.5; an exception was in southern Griffins Bay where enrichment factors were greater than 5.9, 3.5 and 1.8 for Zn, Pb and Cu respectively. Trace metal contamination can be monitored geochemically by trace element divergence from the Rb concentration versus depth profiles. A major contributor to sediment trace metal contamination in Lake Illawarra consists of distinctive, fugitive industrial particles. Trace metal-depth concentration profiles and anthropogenic markers can be used in conjunction with the t
Coastal Education and Research Foundation
ISSN : 0749-0208 CODEN : JCRSEK
Journal of coastal research Y. 1997, vol. 13, No. 4, pages 1181-1191 [bibl. : 1 p.1/4]
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