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PAHs in air and seawater along a north-south Atlantic transect: trends, processes and possible sources.

Research output: Contribution to journalJournal article

Published

  • Luc Nizzetto
  • Rainer Lohmann
  • Rosalinda Gioia
  • Annika Jahnke
  • Christian Temme
  • Jordi Dachs
  • Pierre Herckes
  • Antonio Di Guardo
  • Kevin C. Jones
Journal publication date1/03/2008
JournalEnvironmental Science and Technology
Journal number5
Volume42
Number of pages6
Pages1580-1585
Original languageEnglish

Abstract

Polycyclic aromatic hydrocarbons (PAHs) were simultaneously measured in air and surface seawater between 49° N and 25° S in the open Atlantic Ocean. Elevated concentrations of PAHs (Σ10 PAHs ≈ 1.4–2.5 ng m−3 air, and 0.7–1 ng L−1 seawater) occurred in the Biscay Bay and off the northwest coast of Africa. The unexpectedly high concentrations off NW Africa were discussed assessing the possible contribution of the emerging oil industry along the African shore, the role of biomass burning and natural sources of PAHs. In the southern Atlantic, concentrations of PAHs were close to detection limits (Σ10 PAHs ≈ 0.02–0.5 ng m−3 air, and 0.06–0.5 ng L−1 seawater) and showed decreasing trends with increasing latitudes. Correlations of PAHs’ partial pressures versus inverse temperature were not significant, in contrast to results for polychlorinated biphenyls from the same transect. This could have been due to the importance of ongoing primary sources and the shorter atmospheric life-times of PAHs. Air–water fugacity ratios (fa/fw) were calculated for selected compounds. They were close to 1 for fluoranthene and pyrene in remote open ocean areas suggesting air–water partitioning near equilibrium. Ratios for anthracene and phenanthrene were <0.3 in the remote tropical Atlantic, suggesting net volatilization.