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Simulation of Selenium Remobolisation and cycling in sediment

  • Palm, Erik
Publication Date
Jan 01, 1997
DiVA - Academic Archive On-line
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Lake Macquarie is the largest estuarine lake in New South Wales and is located on the eastern seaboard of Australia, approximately 85 km north of Sydney.The study of heavy metal concentrations in surficial sediments, sediment cores, seagrasses and fish conducted by the New South Wales Department of Mines in 1974 revealed that significant heavy metal contamination of Lake Macquarie has occurred. The metalloid selenium was found in elevated concentrations in 1987. Selenium has a complex chemistry and is both an important nutrient and in high concentrations toxic. This review describes briefly the Lake Macquarie environment and suggests some approaches of modelling the remobilisation and cycling of selenium in sediment. The biogeochemical cycling of selenium in an estuarine environment is exceedingly complex. Factors include Eh, pH, ligand complexing ability, solubility of selenium containing minerals, sediment/soil characteristics, microbially-mediated reactions and physical reworking by biota (bioturbation). The goal of the model will be to be able to estimate the transport rates from a calculated value of Se concentration in sediment pore water resulting in a Se flux value for the interface between sediment and overlaying water. /

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