Abstract
Bacteria were greater in numbers in sediment in that part of a river receiving effluents from various sources. Isolates from the sediment were able to concentrate Cr, Cu, Mn, Fe, Pb and Zn. When tubificids were fed bacterial cultures containing these metals the tubificids showed increased concentration of metals. It is thought that small amounts of metals in effluents are concentrated by bacteria and are then passed to other organisms in a food chain.
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