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Surface-water-quality assessment of the upper Illinois River Basin in Illinois, Indiana, and Wisconsin — Spatial distribution of geochemicals in the fine fraction of streambed sediment, 1987

September 1, 2000

Geochemical data for the upper Illinois River Basin are presented for concentrations of 39 elements in streambed sediment collected by the U.S. Geological Survey in the fall of 1987. These data were collected as part of the pilot phase of the National Water-Quality Assessment Program. A total of 372 sites were sampled, with 238 sites located on first- and second-order streams, and 134 sites located on main stems. Spatial distribution maps and exceedance probability plots are presented for aluminum, antimony, arsenic, barium, beryllium, boron, cadmium, calcium, carbon (total, inorganic, and organic), cerium, chromium, cobalt, copper, gallium, iron, lanthanum, lead, lithium, magnesium, manganese, mercury, molybdenum, neodymium, nickel, niobium, phosphorus, potassium, scandium, selenium, silver, sodium, strontium, sulfur, thorium, titanium, uranium, vanadium, yttrium, and zinc. For spatial distribution maps, concentrations of the elements are grouped into four ranges bounded by the minimum concentration, the 10th, 50th, and 90th percentiles, and the maximum concentrations. These ranges were selected to highlight streambed sediment with very low or very high element concentrations relative to the rest of the streambed sediment in the upper Illinois River Basin. Exceedance probability plots for each element display the differences, if any, in distributions between high- and low-order streams and may be helpful in determining differences between background and elevated concentrations.

Citation Information

Publication Year 1998
Title Surface-water-quality assessment of the upper Illinois River Basin in Illinois, Indiana, and Wisconsin — Spatial distribution of geochemicals in the fine fraction of streambed sediment, 1987
DOI 10.3133/wri984109
Authors Faith A. Fitzpatrick, Terri Arnold, John A. Colman
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Water-Resources Investigations Report
Series Number 98-4109
Index ID wri984109
Record Source USGS Publications Warehouse
USGS Organization Illinois Water Science Center

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