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The combined toxicity of three common trace elements - aluminum, copper and manganese - on the endemic freshwater amphipod Paramelita nigroculus (Barnard) was studied in acidic waters. In soft a rtificial water (distilled water to which appropriate salts had been added), after exposure periods of 21d and at a concentration of 1.388mg/L Al+0.018mg/L Cu, survival was 55% for juveniles...
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