||Most Dilute Lake in the World.
Eilers, J. M. ;
Sullivan, T. J. ;
Hurley, K. C. ;
||E and S Environmental Chemistry, Inc., Corvallis, OR. ;NSI Technology Services Corp., Corvallis, OR.;Corvallis Environmental Research Lab., OR.
Electrical resistivity ;
Air pollution monitoring ;
Cascade Range ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Lake Notasha, near the crest of the Oregon Cascade mountain range, is the most dilute lake known. The measured conductivity during two visits was 1.3 and 1.6 microS/cm, with a sum of base cations of 9 and 18 microequivalents/L; bicarbonate was the dominant anion. Most of the cations in the lake can be accounted for by evapoconcentration of precipitation although input of weathering products cannot be excluded as a source. The topographic watershed has a mixed coniferous forest, but the hydrologic setting of the lake apparently minimizes watershed contributions. This feature makes lakes such as Notasha appropriate receptors for monitoring atmospheric contaminants. (Copyright (c) 1990 Kluwer Academic Publishers.)