CRITICAL PH SCALING INDEXES

The effect on the critical pH of calcium carbonate scaling of ions such as magnesium and sulfate is explored and critical pH values for other slightly soluble salts of concern in cooling water applications are reported. Data presented for calcium sulfate indicate that between 5 and 10 times the solubility product concentrations are required before precipitation begins, for calcium carbonate about 35 times the solubility product concentration is needed, and for calcium phosphate the factor is about 1000. In the order presented, these calcium salts are less soluble than their predecessor and the lower the solubility, the greater is the relative amount of supersaturation required to initiate precipitation and scale formation.

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  • Corporate Authors:

    National Association of Corrosion Engineers

    P.O. Box 1499
    Houston, TX  United States  77001
  • Authors:
    • Feitler, H
  • Publication Date: 1975-8

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Filing Info

  • Accession Number: 00125014
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 18 1975 12:00AM