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CHEMICAL CHARACTERISTICS AND TEMPORAL TRENDS IN EIGHT STREAMS OF THE CATSKILL MOUNTAINS, NEW YORK
Citation:
Murdoch, P. AND J. Stoddard. CHEMICAL CHARACTERISTICS AND TEMPORAL TRENDS IN EIGHT STREAMS OF THE CATSKILL MOUNTAINS, NEW YORK. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/299 (NTIS PB94190535), 1993.
Description:
Discharge-concentration relations in eight streams studied by the U.S. Geological Survey as part of the U.S. EPA Long-Term Monitoring Project (1983 - 1989) indicate acidification of some streams by sulfuric and nitric acid from atmospheric deposition, and organic acids from soils. oncentrations of major ions in precipitation were similar to those reported at other sites in the Northeast. verage concentrations of sulfate and nitrate were similar among streams; base cation concentrations differed widely and the differences paralleled variations in acid neutralizing capacity (ANC). aseflow ANC is not a strong predictor of stream acidity at high flow; some streams with high baseflow ANC showed declines to near zero ANC at high flow and one stream with low ANC at baseflow did not approach zero ANC as flow increased. pisodic decreases in ANC and pH during peak flows were associated with increases in concentrations of nitrate and dissolved organic carbon. ifferences between measured ANC and concentrations of calcium and magnesium were equivalent to concentrations of sulfate. pisodic decreases in ANC and pH during peak flows were associated with increases in nitrate concentrations and dissolved organic carbon. luminum concentrations exceeding 300 ug/L were observed during peak flows in headwater streams of the Neversink River and Rondout Creek. easonal Kendalls tests for temporal trends indicate that streamwater sulfate concentrations have generally decreased, and nitrate concentrations increased during the period 1983-1989.
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CHEMICAL CHARACTERISTICS AND TEMPORAL TRENDS IN EIGHT STREAMS OF THE CATSKILL MOUNTAINS, NEW YORK