Calcium phosphate

Calcium phosphate is a family of materials and minerals containing calcium ions (Ca2+) together with inorganic phosphate anions. Some so-called calcium phosphates contain hydroxide, hydrogen phosphate, or metaphosphate and should be termed calcium hydroxyphosphates, calcium hydrogenphosphates, etc; however, these names are often used interchangeably.

Chemistry

Calcium phosphate is one of the main combustion products of bone (see bone ash). Calcium phosphate is also commonly derived from inorganic sources such as mineral rock. It is usually used as a cheap source of calcium in food supplements and fertilizers.

Uses

Calcium phosphate is used in a variety of applications, including as a nutritional supplement, in water treatment processes, and in the manufacture of glass, ceramics, and cement. It is also used in medicine and dentistry because of its similarity to human bone and teeth.

Health and safety

Ingesting calcium phosphate in moderate amounts is safe for most people. However, excessive consumption can lead to health problems such as kidney stones and hardening of the arteries. It is also a potential irritant to the eyes, skin, and respiratory tract.

See also

• Hydroxyapatite
• Tricalcium phosphate
• Monocalcium phosphate
• Dicalcium phosphate