Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - PAHs in air and seawater along a north-south Atlantic transect: trends, processes and possible sources.
AU - Nizzetto, Luc
AU - Lohmann, Rainer
AU - Gioia, Rosalinda
AU - Jahnke, Annika
AU - Temme, Christian
AU - Dachs, Jordi
AU - Herckes, Pierre
AU - Di Guardo, Antonio
AU - Jones, Kevin C.
PY - 2008/3/1
Y1 - 2008/3/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=40949104369&partnerID=8YFLogxK
U2 - 10.1021/es0717414
DO - 10.1021/es0717414
M3 - Journal article
VL - 42
SP - 1580
EP - 1585
JO - Environmental Science and Technology
JF - Environmental Science and Technology
SN - 0013-936X
IS - 5
ER -