Abstract
The reaction of sea water with sodium tri-polyphosphate, a compound found in Hagevap sea water phosphate additive, has been examined and precipitates so prepared, in fresh and fully hydrolysed forms, have been examined by X-Ray powder diffraction analysis. Constituent compounds have been identified in the powder patterns and compared with patterns of industrial phosphate scales and sludges. The powder pattern “fog” or diffuse halo commonly associated with such scales has been re-examined and found to contain detail sufficient to characterise the commonest form of polyphosphate found—as β-calcium orthophosphate, or Whitlockite.
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