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Toxicity of Sediment from a Mining Spill to Cylindrotheca closterium (Ehremberg) Lewin and Reimann (Bacillariophyceae)

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On April 25th 1998 a holding pool containing acid sludge from Aznalcóllar mine (owned by the Canadian-Swedish Company Boliden Ltd.) accidentally poured on the Guadiamar River (a tributary of the Guadalquivir River). Arround five million cubic meters of sludge polluted with heavy metals, mainly Zn, As, Pb, Cu and Cd (Blasco et al., 1999).

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