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Calculating the pH of Calcium Carbonate Saturation
Author(s) -
Pisigan Rodolfo A.,
Singley J. Edward
Publication year - 1985
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1985.tb05624.x
Subject(s) - saturation (graph theory) , ionic strength , chemistry , aqueous solution , carbonate , calcium carbonate , ionic bonding , thermodynamics , mineralogy , inorganic chemistry , analytical chemistry (journal) , mathematics , ion , chromatography , physics , combinatorics , organic chemistry
Two new expressions for the pH of saturation (pH s ) 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 s and takes into account ionic speciation and an activity correction factor. Different methods of determining pH s of 155 water samples were compared using the Langelier equation, the Larson–Buswell formula, the two pH s equations derived in this study, two mathematical models obtained from multivariate analysis, the WATSPEC2 computer program, and Caldwell–Lawrence diagrams.