石油汚染が海洋生物に及ぼす影響の基礎的研究-1-流出油乳化剤の植物プランクトンに対する致死濃度

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The lethal concentrations of 84 commercially produced oil-spill emulsifiers for marine phytoplankton were determined by culture experiments. The samples of oil-spill emulsifiers were collected in August of 1971 (54 domestic and foreign products), 1973 (12 domestic products), 1974 (14 domestic products) and 1975 (4 foreign products). Among 3 species of phytoplankton used as test organisms, Skeletonema costatum was the most sensitive, Nitzschia closterium moderately sensitive, and Chlamydomonas sp. The least sensitive to the toxicity of oil-spill emulsifiers. The toxicity of oil-spill emulsifiers was reduced year after year due to the improvements in their components. The most recently produced oil-spill emulsifiers did not inhibit the growth of Skel. Costatum at a concentration of 100 ppm; moreover, some of them allowed the growth of this alga even at a concentration of 10, 000 ppm.
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