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Distribution and chemical state of heavy metal ions absorbed by chlorella regularis cells


, : Distribution and chemical state of heavy metal ions absorbed by chlorella regularis cells. Agricultural & Biological Chemistry 45(4): 903-908

Experiments were undertaken to determine whether the distribution of Cu, Cd and uranyl ions in Chlorella cells differed with different heavy metal ions. The amounts of these 3 metals in each cell fraction were in the following decreasing order: intracellular soluble fraction > intracellular particle fraction .mchgt. cell wall fraction. Heavy metal ions were abundant in the intracellular soluble fraction and only 3-5% of the heavy metal ions were in the cell wall fraction. The distribution of uranyl ion in Chlorella cells differed from both that of Cu ion and Cd ion. The distribution of heavy metal ions in the intracellular soluble fraction was investigated in detail by gel filtration, which showed that Cu ion was present in both the high- and low-MW fractions, while Cd and uranyl ions were present only in the high-MW fraction. Substances combined with heavy metal ions in Chlorella cells differed with different heavy metal ions. The chemical state of cupric ion absorbed in cells was studied in detail using ESR. The values of g.dblvert. and A.dblvert. (Cu) of cupric ion showed that cupric ion was coordinated by 2 N and 2 O atoms.

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