Priority-pollutant trace elements in streambed sediments of the Cook Inlet basin, Alaska, 1998-2000
Water-Resources Investigations Report
2002-4163
By: Steven A. Frenzel
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Abstract
Trace element concentrations in 48 streambed sediment samples collected at 47 sites in the Cook Inlet Basin, Alaska, were compared to concentrations from studies in the conterminous United States using identical methods and to Probable Effect Concentrations. Concentrations of arsenic, chromium, mercury, and nickel in the 0.063-mm size fraction of streambed sediments from the Cook Inlet Basin were elevated relative to reference sites in the conterminous United States. Concentrations of cadmium, lead, and zinc were highest at the most urbanized site in Anchorage and at two sites downstream from an ore body in Lake Clark National Park and Preserve. At least 35 percent of the 48 samples collected in the Cook Inlet Basin exceeded the Probable Effect Concentration for arsenic, chromium, or nickel. More than 50 percent of the samples were considered to have low potential toxicity for cadmium, lead, mercury, nickel, selenium, and zinc. A Probable Effect Concentration quotient that reflects the combined toxicity of arsenic, cadmium, chromium, copper, lead, mercury, nickel, and zinc was exceeded in 44 percent of the samples from the Cook Inlet Basin. The potential toxicity was high in the Denali and Lake Clark National Parks and Preserves where organic carbon concentrations in streambed sediments were low. However, potential toxicity results should be considered in context with the very small amounts of fine-grained sediment present in the streambed sediments of the Cook Inlet Basin.
Suggested Citation
Frenzel, S.A., 2002, Priority-pollutant trace elements in streambed sediments of the Cook Inlet basin, Alaska, 1998-2000: U.S. Geological Survey Water-Resources Investigations Report 2002-4163, 12 p.; 3 illus.; 4 tables, https://doi.org/10.3133/wri024163.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Priority-pollutant trace elements in streambed sediments of the Cook Inlet basin, Alaska, 1998-2000 |
| Series title | Water-Resources Investigations Report |
| Series number | 2002-4163 |
| DOI | 10.3133/wri024163 |
| Year Published | 2002 |
| Language | ENGLISH |
| Description | 12 p.; 3 illus.; 4 tables |