Laboratory of Aquatic Field Science, Division of Aquatic Field Science, Department of Animal and Marine Biosource Science, Faculty of Agriculture, Kyushu University
九州大学農学研究院動物資源科学部門 アクアフィールド科学
We examined the toxic effects of thallium and indium on brackish-water and marine species. Acute toxicity tests were conducted on Americamysis bahia, Brachionus plicatilis, Artemia salina, and Sillago japonica. The LC50 values of thallium ranged from 3.48 to 100 mg/L, and this metal exhibited the strongest toxic effects on A. bahia. With regard to indium toxicity, the LC50 values ranged from 24 to 51 mg/L, and the strongest toxic effects were noted in B. plicatilis. The toxicity of thallium is higher than that of other rare metals toward both freshwater and marine species. Further, we examined the effects of salinity on thallium and indium toxicities toward A. salina. We found that the survival rates of A. salina individuals following exposure to thallium or indium were strongly influenced by the salinity of the medium. The 48-h LC50 of these metals decreased as the salinity of the medium decreased.
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