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The success of elutriate tests in extended prediction of water quality after a dredging operation under freshwater and saline conditions

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Abstract

Dredging simulation by elutriate tests accurately predicted concentrations of Hg, Cu, Mn and Fe released to the water column from contaminated sediment to within 1 order of magnitude. Hg and Cu concentrations increased by up to 7-fold after dredging, but declined to background concentrations within 48 h. Maximum loadings of Hg and Cu coincided with Fe and total organic carbon (TOC) water column concentrations, suggesting Hg and Cu are adsorbed onto particulates of Fe oxides and organic material. Seasonal changes in redox potential and temperature did not significantly affect metal release from sediments. Saline water did not cause significant increases in contaminant release from sediments to the water column over that observed for freshwater. Water quality standards of 1 µg l−1 Hg and 28 µg l−1 Cu as annual averages were not breached by dredging operations. Long-term effects of dredging on Hg and Cu availability, due to deposition of contaminated material as surficial sediments, is, however, of concern.

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Edwards, S.C., Williams, T.P., Bubb, J.M. et al. The success of elutriate tests in extended prediction of water quality after a dredging operation under freshwater and saline conditions. Environ Monit Assess 36, 105–122 (1995). https://doi.org/10.1007/BF00546784

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  • DOI: https://doi.org/10.1007/BF00546784

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