About the Propriety of Dispersing Method for Spilled Oil on Sea

概要

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At the treatment of spilled oil on sea, dispersing method using oil dispersers is frequently applied and the toxicity of oil disperser has been called in question. We studied on the toxicity of marketed oil dispersers and some of them were found to be almost non-toxic.<BR>We also studied on the toxicity of oil itself and found the oil in floating state had low toxicity for fishes, nevertheless dispersed oil droplets had high toxicity and the toxicity of oil dued to the aromatic and naphthenic component contained in oil.<BR>We compared the damage of environment caused by both floating oil layer and dispersed oil droplets and deduced as follows;<BR>1. Spilled oil when abandoned as floating oil layer has low toxicity for fishes, but gives heavy damages to marine life on sea surface (laver or sloke) and the pollution of environment will continue for long period.<BR>2. Spilled oil when treated by oil dispersers comes into sea water as fine oil droplets which have high toxicity for fishes but the damages of marine life on sea surface are controlled locally and the pollution of environment will discontinue in short period by natural digestions.
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