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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
distributions)
Optimization
number 2
(2 monoprotic
acids)
1
(Carboxylics)
Site density 0.1751 0.1925
pKa mean 5.502 5.584
pKa std. dev. 0.047
2
(Phenolics)
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
http://or.water.usgs.gov

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