Effects of Superdispersant-25 on the sorption dynamics of naphthalene and phenanthrene in marine sediments

Luis J. Perez Calderon* (Corresponding Author), Lloyd D. Potts, Alejandro Gallego, James A. Anderson, Ursula Witte

*Corresponding author for this work

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Abstract

Purpose: The present study evaluated the effects of Superdispersant-25 (SD25), a commercial dispersant stockpiled in the UK for oil spill response, on the sorption dynamics of two polyaromatic hydrocarbons, naphthalene (NAP) and phenanthrene (PHE), in sediment-seawater systems using three sediments near hydrocarbon exploration areas in the Faroe-Shetland Channel and North Sea. Materials and methods: Batch experiments were conducted to evaluate the effects of SD25 on the solubility (analysed by gas chromatography), distribution coefficients and desorption hysteresis of NAP and PHE separately as well as SD25 in the three sediments (analysed by UV-vis spectroscopy and surface tension measurements, respectively). Results and discussion: The results revealed that SD25 readily adsorbed to all sediment types but did not desorb from silty loam. SD25 application increased the solubility in seawater of PHE but not of NAP. Adsorbed SD25 increased the distribution coefficients of both polyaromatic hydrocarbons in sand but not silty loam and the solubilising effect of SD25 appeared to drive increased adsorption of PHE rather than sediment-adsorbed SD25 concentration. Conclusions: The findings highlight the influence of SD25 application on the sorption dynamics of NAP and PHE in marine sediments from areas near hydrocarbon exploration and production regions. An understanding of these interactions may aid responders in the decision-making process of dispersant application in the event of a spill as seabed characteristics affect oil-dispersant-sediment interactions.

Original languageEnglish
Pages (from-to)1576-1586
Number of pages11
JournalJournal of Soils and Sediments
Volume19
Issue number3
Early online date26 Oct 2018
DOIs
Publication statusPublished - Mar 2019

Keywords

  • Dispersant
  • Naphthalene
  • Oil spill
  • PAHs
  • Phenanthrene
  • Sediment
  • Solubility
  • Sorption

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