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The impact of preload on the mobilisation of multivalent trace metals in pyrite-rich sediment

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Abstract

Trace metals occur at various concentrations in all wetlands. Their proliferation, chemical speciation, mobility and bioavailability are dependent on the redox potential (Eh), pH and the presence of organic and inorganic adsorption surfaces and co-precipitating metals. Consequently, changes in these key parameters have the potential to alter the fate of the dominant trace metal species in the sediment. An imposition of preload surcharge is a technique use in geotechnical engineering to improve in the strength and load carrying capacity of waterlogged sediments. The soil strength improvement is effected through the expulsion of porewater from the sediment. The imposition of surcharge over wetland sediments has the potential to create oxygen-deficient condition within the sediment, and cause pH, temperature, redox, EC and salinity changes in the sediment, which would impact on the mobilisation, chemical speciation, mobility and bioavailability of dominant toxic trace metals and their toxicity in the sediment. In the present work, a case study of the impact of preload surcharge on the proliferation, chemical speciation, mobilisation, mobility and bioavailability of arsenic, chromium, cobalt, copper and zinc in a naturally occurring pyrite-rich sediment is presented. The imposition of preload surcharge over the pyrite-rich sediment was accompanied by changes in the redox dynamics of the sediment, with multi-facet impact on the concentration, mobilisation and bioavailability of toxic trace metals, their redox transformation between oxidation states and on the toxicity within and outside the sediment environment.

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Funding

This research was founded by the Maiden Geotechnics and Australian Commonwealth Scholarship awarded by the University of South Australia to the first author.

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Authors and Affiliations

  1. Future Industries Institute, University of South Australia, Mawson Lakes Campus, Adelaide, South Australia, Australia

    O. Karikari-Yeboah, W. Skinner & J. Addai-Mensah

  2. Maiden Geotechnics, P. O. Box 2079, Nerang East, QLD, 4211, Australia

    O. Karikari-Yeboah

Authors
  1. O. Karikari-Yeboah
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  2. W. Skinner
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  3. J. Addai-Mensah
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Correspondence to O. Karikari-Yeboah.

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Karikari-Yeboah, O., Skinner, W. & Addai-Mensah, J. The impact of preload on the mobilisation of multivalent trace metals in pyrite-rich sediment. Environ Monit Assess 190, 398 (2018). https://doi.org/10.1007/s10661-018-6744-x

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  • DOI: https://doi.org/10.1007/s10661-018-6744-x

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