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Spirodela polyrhiza (L.) SP 20 was hypersensitive to Cu (1-100 μmol/L) compared with Ni (25- 500 μmol/L). Lower Cu concentration (1 μmol/L) or Ni (25 μmol/L) stimulated general growth of the test organism compared with toxicity at elevated concentrations of both of the cations. Cu uptake was very fast during the first 10 min and remained stable irrespective of the extension of incubation....