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Mar Pollut Bull. 2010 Sep;60(9):1550-9. doi: 10.1016/j.marpolbul.2010.04.012. Epub 2010 May 18.

Effects of temperature and wave conditions on chemical dispersion efficacy of heavy fuel oil in an experimental flow-through wave tank.

Author information

1
COOGER, Bedford Institute of Oceanography, Fisheries and Oceans (DFO) Canada, Dartmouth, NS, Canada. Zhengkai.Li@dfo-mpo.gc.ca

Abstract

The effectiveness of chemical dispersants (Corexit 9500 and SPC 1000) on heavy fuel oil (IFO180 as test oil) has been evaluated under different wave conditions in a flow-through wave tank. The dispersant effectiveness was determined by measuring oil concentrations and droplet size distributions. An analysis of covariance (ANCOVA) model indicated that wave type and temperature significantly (p<0.05) affected the dynamic dispersant effectiveness (DDE). At higher temperatures (16 degrees C), the test IFO180 was effectively dispersed under breaking waves with a DDE of 90% and 50% for Corexit 9500 and SPC 1000, respectively. The dispersion was ineffective under breaking waves at lower temperature (10 degrees C), and under regular wave conditions at all temperatures (10-17 degrees C), with DDE<15%. Effective chemical dispersion was associated with formation of smaller droplets (with volumetric mean diameters or VMD < or = 200 microm), whereas ineffective dispersion produced large oil droplets (with VMD > or = 400 microm).

PMID:
20483435
DOI:
10.1016/j.marpolbul.2010.04.012
[Indexed for MEDLINE]

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