Trace-Element Concentrations in Streambed Sediment Across the

Environ. Sci. Technol. 1999, 33, 2499-2504

Trace-Element Concentrations in Streambed Sediment Across the Conterminous United States KAREN C. RICE U.S. Geological Survey, P.O. Box B, Charlottesville, Virginia 22903

Trace-element concentrations in 541 streambed-sediment samples collected from 20 study areas across the conterminous United States were examined as part of the National Water-Quality Assessment Program of the U.S. Geological Survey. Sediment samples were sieved and the