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RECORD NUMBER: 6 OF 8

Main Title Episodic acidification occurrence, causes and significance to aquatic resources /
Author Wigington, Parker J.
CORP Author National Health and Environmental Effects Research Lab., Corvallis, OR. Western Ecology Div.
Publisher U.S. Environmental Protection Agency, Natioal Health and Environmental Effects Research Laboratory (NHEERL), Western Ecology division,
Year Published 1998
Report Number EPA/600/A-99/003
Stock Number PB99-128373
Additional Subjects Acidification ; Surface waters ; Water chemistry ; Aquatic ecosystem ; Acid neutralizing capacity ; Nitrogen compounds ; Sulfur compounds ; Aluminum ; PH factor ; Acidity ; Hydrogen ion concentration ; Lakes ; Acid streams ; Hydrologic systems ; Stream flow ; Biological communities ; Atmospheric deposition
Holdings
Library Call Number Additional Info Location Last
Modified		 Checkout
Status
NTIS  PB99-128373 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 16 pages ; 28 cm
Abstract
Episodic acidification, the short-term decrease of acid neutralizing capacity (ANC) during hydrological events, commonly occurs in streams and lakes around the world. in localities receiving low levels of atmospheric deposition of N and S compounds, acidic episodes (ANC < or = 0) do not occur unless watershed sources of acidity are present. In regions receivng high levels of atmospheric deposition of acidic N and S compounds, acidic episodes with episodic minimum pH levels < or = 5 and high inorganic Al concentrations are common. Acidic episodes can have adverse effects on fish populations and other biota in streams. Assessments and evaluations of the aquatic effects of acidic deposition should consider explicitly the occurrences and consequences of episodic acidification.
Notes
"EPA/600/A-99/003." "September 1998." Includes bibliographical references. "Paper for: Proceedings of 1998 Pennsylvania Acidific Deposition Conference, The Pennsylvania State University, University Park, PA, September 14-16, 1998." Microfiche.