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The effect of two chemical dispersants (Corexit 7664 and Corexit 9524) in the emulsification of a light and heavy Arabian crude oil types was investigated in context of dispersant concentration to oil ratio, rate of mixing and time of mixing. The ability of Corexit 7664 and 9524 to emulsify light and heavy crude oil was dependant on the concentration of the dispersant, the rate of mixing and the duration of mixing. Extrapolation of the results to rough and calm sea conditions suggests that the application of 6 % Corexit 9524 to oil present in rough seas would remove 95 % of the surface oil slick. Light oil spill in calm seas can be dispersed by the application of 4 % Corexit 9524 effecting 80 % removal from the sea surface.
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Department of Marine Chemistry, Faculty of Marine Science, University of King Abdulaziz, P.O. Box 1540, 21441 Jeddah, Saudi Arabia.