Calcium phosphate

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Calcium phosphate is a family of materials and minerals containing calcium ions (Ca2+) together with inorganic phosphate anions. Some so-called calcium phosphates contain oxide and hydroxide as well. They are white solids of nutritious value.[1]

Orthophosphates, di- and monohydrogen phosphates[edit]

These materials contain Ca2+ combined with PO43−, HPO42−, and/or H2PO4:

Di- and polyphosphates[edit]

These materials contain Ca2+ combined with the polyphosphates, such as P2O74− and triphosphate [P3O10]5−:

Hydroxy- and oxo-phosphates[edit]

These materials contain other anions in addition to phosphate:

Overview[edit]

Calcium phosphates are found in many living organisms, e.g., bone mineral and tooth enamel. In milk, it exists in a colloidal form in micelles bound to casein protein with magnesium, zinc, and citrate - collectively referred to as colloidal calcium phosphate (CCP).[2] Various calcium phosphate minerals are used in the production of phosphoric acid and fertilizers. Overuse of certain forms of calcium phosphate can lead to nutrient-containing surface runoff and subsequent adverse effects upon receiving waters such as algal blooms and eutrophication.

References[edit]

  1. ^ Klaus Schrödter; Gerhard Bettermann; Thomas Staffel; Friedrich Wahl; Thomas Klein; Thomas Hofmann (2008). Phosphoric Acid and Phosphates. Ullmann’s Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_465.pub3. 
  2. ^ A. Y. Tamime, ed. (2006). Brined cheeses - The Society of Dairy Technology (SDT). Wiley-Blackwell. ISBN 978-1-4051-2460-7.