Equilibrium passive sampling as a tool to study polycyclic aromatic hydrocarbons in Baltic Sea sediment pore-water systems

Susann-Cathrin Lang, Andrew Hursthouse, Philipp Mayer, Danjiela Koetke, Ines Hand, Detlef Schulz-Bull, Gesine Witt

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62 Citations (Scopus)

Abstract

Solid Phase Microextraction (SPME) was applied to provide the first large scale dataset of freely dissolved concentrations for 9 polycyclic aromatic hydrocarbons (PAHs) in Baltic Sea sediment cores. Polydimethylsiloxane (PDMS) coated glass fibers were used for ex-situ equilibrium sampling followed by automated thermal desorption and GC–MS analysis. From the PAH concentrations in the fiber coating we examined (i) spatially resolved freely dissolved PAH concentrations (Cfree); (ii) baseline toxicity potential on the basis of chemical activities (a); (iii) site specific mixture compositions; (iv) diffusion gradients at the sediment water interface and within the sediment cores and (v) site specific distribution ratios. Contamination levels were low in the northern Baltic Sea, moderate to elevated in the Baltic Proper and highest in the Gulf of Finland. Chemical activities were well below levels expected to cause narcosis to benthos organisms. The SPME method is a very sensitive tool that opens new possibilities for studying the PAHs at trace levels in marine environments.
Original languageEnglish
Pages (from-to)296-303
JournalMarine Pollution Bulletin
Volume101
Issue number1
DOIs
Publication statusPublished - 15 Dec 2015

Keywords

  • Sediment pollution
  • Freely dissolved pore water concentration
  • Equilibrium passive sampling
  • Bioavailability
  • Polycyclic aromatic hydrocarbons

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