Heavy metal contamination of river and dam water is a worrying problem in South Africa. Though lead levels in the Hartebeespoort and Vaal dams have declined, cadmium levels have risen slightly over recent years.
Heavy metal contamination of river and dam water is a worrying problem in South Africa. Though lead levels in the Hartebeespoort and Vaal dams have declined, cadmium levels have risen slightly over recent years.
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