Concentration, Distribution, and Comparison of Selected Trace Elements in Bed Sediment and Fish Tissue in the South Platte River Basin, USA, 1992–1993 |
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Authors: | J S Heiny C M Tate |
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Institution: | (1) U.S. Geological Survey, Box 25046, MS 415, Denver, Colorado 80225, USA , US |
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Abstract: | During August–November 1992 and August 1993, bed
sediment and fish liver were sampled in the South Platte River Basin and
analyzed for 45 elements in bed sediment and 19 elements in fish liver. The
results for aluminum, arsenic, cadmium, chromium, copper, iron, lead,
manganese, selenium, silver, uranium, and zinc are presented here. All 12
trace elements were detected in bed sediment, but not all were detected in
fish liver or in all species of fish. A background concentration of trace
elements in bed sediment was calculated using the cumulative frequency curves
of trace element concentrations at all sites. Arsenic, cadmium, copper, lead,
manganese, silver, uranium, and zinc concentrations were greater than
background concentrations at sites in mining areas or at sites that have
natural sources of these elements. Trace element concentrations in fish liver
generally did not follow the same patterns as concentrations in bed sediment,
although concentrations of aluminum and cadmium were higher in fish liver
collected at mountain sites that had been disturbed by mining. Concentrations
of aluminum, arsenic, cadmium, chromium, copper, iron, lead, silver, and zinc
increased in bed sediments in urban areas. Iron, silver, and zinc
concentrations in fish liver also increased in urban areas. Concentrations of
cadmium, copper, silver, and zinc in fish liver increased in the agricultural
areas of the basin. Downstream changes in trace element concentrations may be
the result of geological changes in addition to changes in land use along the
river.
Received: 5 April 1996/Revised: 27 July 1996 |
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