Mapping of hydrophobic organic compounds (HOCs) in surface seawater on an east-to-west transect of the South Atlantic Ocean (SAO) and across the Black Sea (BS) in 2016 was performed by a dynamic passive sampling device containing silicone-based passive samplers. In SAO as well as in BS the measurements confirmed freely dissolved concentrations of polychlorinated biphenyls, DDT and its metabolites, chlorobenzenes, cyclodiene pesticides, and brominated flame retardants in the range of units to low hundreds of pg per litre. The findings indicate that the spatial distribution of HOCs and emerging pollutants in the SAO and the BS is influenced by riverine inputs, ocean currents and atmospheric deposition from continental plumes. Observed concentration gradients indicate that eastern SAO receives DDT from sources in South Africa, whereas the emissions of endosulfan originate in South America. Elevated HOC concentrations in the northwestern BS are related to their discharge by rivers from the European continent.

Environmental Institute Okružná 784 42 972 41 Koš Slovakia

Masaryk University Faculty of Science RECETOX Kamenice 753 3 625 00 Brno Czech Republic

Masaryk University Faculty of Science RECETOX Kamenice 753 3 625 00 Brno Czech Republic; Max Planck Institute for Chemistry Multiphase Chemistry Department Hahn Meitner Weg 1 55128 Mainz Germany

Max Planck Institute for Chemistry Multiphase Chemistry Department Hahn Meitner Weg 1 55128 Mainz Germany

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Passive sampling and benchmarking to rank HOC levels in the aquatic environment