Potentiation of the toxic action of copper in the presence of lanthanum in bioassays for Daphnia magna Straus (Cladocera, Crustacea)

The available data on the combined action of rare earth elements and heavy metals are contradictory. Therefore, goal presented work is relevant – to determine effects solutions copper, lanthanum salts their equimolar mixtures under controlled conditions for Daphnia magna Straus. It has been established that death D. over 50% in containing Cu2+ observed at a calculated concentration 0.05 mg/L (0.0008 mmol/L), similar effect with La3+ occurs dose 50 (0.36 mmol/L). potentiation lethal copper presence shown. E.g., Cu La salts, where sum non-lethal concentrations (0.00016 0.0008 100% after 96 24 hours, respectively. Further, was confirmed bioassays evaluating locomotor activity magna. Solutions mixture “Cu2+ La3+” (1:1) inhibit motor daphnia similarly only Cu2+. Thus, despite significant difference between effective (by 1,000), it found doses metals, an increase toxicity observed.