by the introduction of Corexit 9500, which includes the same surfactants incorporated into a different solvent (George-Ares and Clark, 2000). Both products contain a mixture of nonionic (48 percent) and anionic (35 percent) surfactants. The major nonionic surfactants include ethoxylated sorbitan mono- and trioleates and sorbitan monooleate; the major ionic sur-
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3 Dispersant-Oil Interactions and Effectiveness Testing ."
Oil Spill Dispersants: Efficacy and Effects . Washington, DC: The National Academies Press,
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