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RECORD NUMBER: 20 OF 147

OLS Field Name OLS Field Data
Main Title Chemical Characteristics and Temporal Trends in Eight Streams of the Catskill Mountains, New York. (Revised).
Author Murdoch, P. S. ; Stoddard, J. L. ;
CORP Author Corvallis Environmental Research Lab., OR. ;ManTech Environmental Technology, Inc., Corvallis, OR. ;Geological Survey, Albany, NY. Water Resources Div.
Publisher c1993
Year Published 1993
Report Number EPA/600/J-94/299;
Stock Number PB94-190535
Additional Subjects Acidification ; Streams ; Chemical properties ; Air pollution effects ; Catskill Mountains ; Atmospheric deposition ; Sulfates ; Nitric acid ; pH ; Concentration(Composition) ; Base flow ; Carbon ; Organic compounds ; Nitrates ; Neutralizing ; Trends ;
Holdings
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Status
NTIS  PB94-190535 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 11/11/1994
Collation 18p
Abstract
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. Concentrations of major ions in precipitation were similar to those reported at other sites in the Northeast. Average concentrations of sulfate and nitrate were similar among streams; base cation concentrations differed widely and the differences paralleled variations in acid neutralizing capacity (ANC). Baseflow 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. Episodic decreases in ANC and pH during peak flows were associated with increases in concentrations of nitrate and dissolved organic carbon. Differences between measured ANC and concentrations of calcium and magnesium were equivalent to concentrations of sulfate. Episodic decreases in ANC and pH during peak flows were associated with increases in nitrate concentrations and dissolved organic carbon.