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REPLY TO PRINCE ET AL.: Ability of chemical dispersants to reduce oil spill impacts remains unclear

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Kleindienst,  S.
Department of Molecular Ecology, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Seidel,  M.
Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Dittmar,  T.
Marine Geochemistry Group, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Citation

Kleindienst, S., Seidel, M., Ziervogel, K., Grim, S., Loftis, K., Harrison, S., et al. (2016). REPLY TO PRINCE ET AL.: Ability of chemical dispersants to reduce oil spill impacts remains unclear. Proceedings of the National Academy of Sciences of the United States of America, 113(11): 1, pp. E1422-E1423.


Cite as: https://hdl.handle.net/21.11116/0000-0001-C323-B
Abstract
Chemical dispersants are applied to oil-contaminated areas as a primary response to oceanic oil spills. The impacts of dispersants on microbial community composition and activity, particularly hydrocarbon turnover, are debated. Kleindienst et al. (1) demonstrated that Corexit 9500, a dispersant, can suppress the activity of oil-degrading microorganisms. Chemically enhanced water-accommodated fractions (CEWAFs) were used for these experiments because the deepwater plume that formed following the Deepwater Horizon (DWH) blowout consisted of the water-accommodated fraction: Roughly half of the discharged oil, along with dispersants applied at the wellhead, was entrained in the deepwater plume (2). Using CEWAFs assured an appropriate simulation of the DWH plume chemistry. Prince et al. (3) claim that the method used to produce CEWAFs would leave most of the added oil floating atop the surface in the bottles. Kleindienst et al. (1) followed standardized methods to produce CEWAFs, and only the dispersed oil fraction was used; no floating oil was present in the experiments (1).