Record Display for the EPA National Library Catalog


Main Title Calculating the pH of Calcium Carbonate Saturation.
Author Pisigan, R. A. ; Singley, J. E. ;
CORP Author Environmental Science and Engineering, Inc., Gainesville, FL. ;Montgomery (James M.), Inc., Gainesville, FL.;Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab.
Year Published 1985
Report Number EPA-R-805400; EPA/600/J-85/248;
Stock Number PB86-139292
Additional Subjects Distribution systems ; Water distribution ; Water pollution ; Calcium carbonates ; Corrosion ; Mathematical models ; pH ; Ionization ; Potable water ; Anions ; Chemical equilibrium ; Solubility ; Statistical analysis ; Computer programming ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB86-139292 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 11p
Two new expressions for the pH of saturation (pH subs) were derived. One is a simplified equation developed from an aqueous carbonate equilibrium system in which correction for ionic strength was considered. The other is a more accurate quadratic formula that involves computerized calculation of pH subs and takes into account ionic speciation and an activity correction factor. Different methods of determining pH subs of 155 water samples were compared with the use of the Langelier equation, the Larson-Buswell formula, the two pH subs equations derived in the study, two mathematical models obtained from multivariate analysis, the WATSPEC2 computer program, and Caldwell-Lawrence diagrams.