ブロマイドイオン存在下における水銀(II)イオンのクロレラへの吸脱着特性とその毒性

概要

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The adsorption, desorption and toxicity of Hg^<2+> in the presence of bromide ion for Chlorella sp. were studied. Hg^<2+> adsorbed on Chlorella cells in phosphate buffer (pH6.0) without Br^- were extractable by the addition of EDTA solution when ion species of [Hg(OH)_2]^0 were dominant : about 70 percent of Hg^<2+> could be desorbed from the cells. No serious damage to viable cells remained. Toxicity was strengthened when [HgBr_2]^0 or [HgBr_3]^- complexes were formed by the addition of Br^- to the cell suspension (pH6.0). Slow liberation of Br^- was observed after incorporation of these complexes had occurred. These results suggested that exchange reactions took place between ligand and adsorption sites of the cells and that, as the result, Hg^<2+> was adsorbed to the cells. Adsorbed Hg^<2+> could no longer be extracted with EDTA solution, The adsorption, desorption and toxicity of Hg^<2+> were fundamentally the same as those observed in acidic conditions (pH2.0), in which ion species of Hg^<2+> became dominant. From these results it was concluded that toxicity was not induced by the adsorption of [HgBr_n] complexes, but by the adsorption of Hg^<2+> to the cells.
社団法人日本生物工学会の論文
1993-03-25