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首页> 外文期刊>Environmental Science & Technology >PAHs in Air and Seawater along a North-South Atlantic Transect: Trends, Processes and Possible Sources
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PAHs in Air and Seawater along a North-South Atlantic Transect: Trends, Processes and Possible Sources

机译：南北大西洋样带中空气和海水中的多环芳烃：趋势，过程和可能来源

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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 (∑_(10) 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 (∑_(10) 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 (f_a/f_w) 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.
机译：在开阔的大西洋中，在空气中和49°N至25°S之间的地表海水中同时测量了多环芳烃（PAH）。比斯开湾和非洲西北海岸的PAHs浓度升高（∑_（10）PAHs≈1.4-2.5 ng m〜（-3）空气，0.7-1 ng L〜（-1）海水）。讨论了非洲西北部异常高的浓度，评估了非洲沿岸新兴石油工业的可能贡献，生物质燃烧的作用和多环芳烃的天然来源。在大西洋南部，PAHs的浓度接近检出限（∑_（10）PAHs≈0.02-0.5 ng m〜（-3）空气，0.06-0.5 ng L〜（-1）海水）并且呈下降趋势随着纬度的增加。与来自同一样带的多氯联苯的结果相反，PAHs分压与逆温度的相关性不显着。这可能是由于持续不断的主要来源的重要性以及PAHs的大气寿命缩短所致。计算选定化合物的气水逸度比（f_a / f_w）。在偏远的开阔海域中，荧蒽和pyr的荧光系数接近1，表明空气-水分配接近平衡。在遥远的热带大西洋中，蒽和菲的比率<0.3，表明净挥发。

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