Elise Irwin Brian Atkins Lopaka Lee D.D. Black Humbert Zappia Joe Hatch Jack Pashin L.H. Barwick W.E. Cartwright Rick Sanzolone Leslie Rupert Allan Kolker Robert Finkelman M. B. Goldhaber 2001 <p>OVERVIEW OF ARSENIC IN STREAM SEDIMENTS The overall range of arsenic in the NURE stream sediments was from 0.3 to 44 mg/kg sediment (ppm) As in the sample data set. The mean value was 4.3 ppm with a standard deviation of 4.1 ppm. For comparison, the crustal abundance of arsenic is 1.8 ppm (Taylor, 1964). Shale is higher, with average values of 15 ppm. Coal samples from the entire USGS National Coal Resource Data System coal database (Finkelman, 1994) average 24 ppm arsenic. A study of stream sediments from throughout the U.S. by the USGS NAWQA program reported that the 75th percentile for arsenic in 541 stream sediments was 9.5 ppm (Rice, 1999). Given the relatively low crustal abundance of arsenic, a number of stream-sediment samples in this study may be considered geochemically anomalous in this element.</p> application/pdf 10.3133/mf2357 en U.S. Geological Survey Arsenic in stream sediments of northern Alabama reports