Ibyuma biremereye ni itsinda ryibintu birimo ibyuma na metalloide nka arsenic, kadmium, chromium, cobalt, umuringa, icyuma, gurş, manganese, mercure, nikel, amabati na zinc. Iyoni z'ibyuma zizwiho kwanduza ubutaka, ikirere na sisitemu y'amazi kandi ni toxi ...
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