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RECORD NUMBER: 29 OF 285

OLS Field Name OLS Field Data
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 ;
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NTIS  PB86-139292 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 11p
Abstract 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.
Supplementary Notes Prepared in cooperation with Montgomery (James M.), Inc., Gainesville, FL. Sponsored by Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab.
Availability Notes Pub. in Jnl. American Water Works Association 77, n10 p83-91 Oct 85.
NTIS Title Notes Journal article.
Title Annotations Reprint: Calculating the pH of Calcium Carbonate Saturation.
PUB Date Free Form c1985
Category Codes 13B; 13K; 7D; 9B; 68D; 71G; 50B; 99A
NTIS Prices Not available NTIS
Primary Description 600/14
Document Type NT
Cataloging Source NTIS/MT
Control Number 607219562
Origin NTIS
Type CAT