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Scientific Investigations Report 2013–5016

Macrophyte and pH Buffering Updates to the Klamath River Water-Quality Model Upstream of Keno Dam, Oregon

Table 4. Dissolved organic-matter acid dissociation constants and site densities for the Link River to Keno Dam reach of the Klamath River, Oregon, resulting from two best-fit optimizations of 24 measured alkalinity titration curves.

[Abbreviations: pKa, acid dissociation constant; std. dev., standard deviations; –, not applicable]

Acid group Model parameter Optimization
number 1
(2 acid
number 2
(2 monoprotic
Site density 0.1751 0.1925
pKa mean 5.502 5.584
pKa std. dev. 0.047
Site density 0.5828 0.6466
pKa mean 9.738 9.594
pKa std. dev. 0.050

First posted March 1, 2013

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201

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