Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Recent Trends in the Acid-Base Status of Surface Waters in Maine, USA.
Author Kahl, J. S. ; Haines, T. A. ; Norton, S. A. ; Davis, R. B. ;
CORP Author Maine Univ. at Orono.;Corvallis Environmental Research Lab., OR.
Publisher c1993
Year Published 1993
Report Number EPA/600/J-94/464;
Stock Number PB95-137261
Additional Subjects Acidification ; Surface waters ; Maine ; Watersheds ; Water pollution monitoring ; pH ; Deposition ; Kinetics ; Water chemistry ; Lakes ; Geochemistry ; Air pollution ; Reprints ; Tunk Mountain(Maine) ; Tunk Mountain Watershed Study ; ANC(Acid neutralizing capacity)
Library Call Number Additional Info Location Last
NTIS  PB95-137261 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/06/1995
Collation 12p
Data from the EPA Long Term Monitoring Program lakes at the Tunk Mtn Watershed, Maine indicate that decreases of < or - 1 micro eq per L per yr in SO4 and increases of < or - 2 micro eq per L per yr in ANC occurred in the 1980s. The sum of base cations also increased. These changes in aquatic chemistry were coincident with decreased concentrations of all solutes in precipitation during the 1980s. Paleolimnologic studies indicate that decreases of 0.1 to 0.5 pH units occurred in a few small mountain lakes during the past 20 to 70 years. However, no ongoing acidification of lakes is indicated based on available data. Only lakes that were already at least marginally acidic appear to have acidified.