水銀(II)イオンのクロレラの増殖に及ぼす影響 : 特に, ブロマイドイオン, チオシアン酸イオン存在下における水銀の毒性

概要

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The toxic effects of mercuric ion on the growth of Chlorella sp. were studied in 0.5% glycine medium containing Br^- or SCN^-. In the presence of Br^-. turbidimetric measurement showed that the cells had a lag before growth even at a concentration of 0.07 mg Hg^<2+>・l^<-1>. The longest lag appeared when 0.3 g・l<-1> Br^- was added. Hg^<2+> in the solution was adsorbed on Chlorella cells immediately and a rapid decrease of viable cell numer was observed. In the presence of SCN^-, the slow adsorption rate of Hg^<2+> to the cells resulted in depression of the growth rate of the cells. No serious damage to viable cells was observed even at a concentration of 0.45 mg Hg^<2+>・l^<-1>. In both cases, the strongest toxicity was obtained at a Br^- or SCN^- ion concentration which [HgX_2] and [HgX_3]^- complexes (X-Br^- or SCN^-) are formed. Formation of [HgX_4]^<2-> complex reduced the toxicity of Hg^<2+>. Other halide ions also strengthened the toxicity of Hg^<2+>. The order of halide ions for increasing the toxicity of Hg^<2+> could be expressed as follows : I^->Br^->SCN^->Cl^-This order was in accordance with the order for the adsoprtion rate of Hg^<2+> to the cell or the facility in formation of halide compolexes of Hg^<2+>.
社団法人日本生物工学会の論文
1990-09-25