Dicalcium phosphate
- Dibasic calcium phosphate
- Dicalcium orthophosphate
- Dicalciummonohydrogenphosphat
- Calcium disodium phosphate
- Calcium hydrogen orthophosphate
- Calcium secondary phosphate
- Calcarea phos
- 7757-93-9
- 7789-77-7 (dihydrate )
Colorless and odorless solid
Fixed
- 2.89 g · cm -3 ( anhydrous)
- 2.32 g · cm -3 ( dihydrate)
About 370 ° C ( decomposition)
Very poor in water ( 0.1 g · l-1 at 25 ° C)
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Calcium hydrogen phosphate is a calcium salt of ortho- phosphoric acid, one of the phosphates and has the composition of CaHPO4.
Occurrence and representation
In nature Calciumhydropenphosphat occurs in different modifications. Anhydrous calcium hydrogen phosphate occurs in nature as Monetit, the dihydrate ( CaHPO4 · 2H2O ) is known as brushite. The elimination of water of crystallization of the dihydrate is carried out at 109 ° C. Technical calcium hydrogen phosphate is prepared by reacting calcium hydroxide with phosphoric acid at high temperatures.
Use
Calcium hydrogen phosphate is an acidity regulator and is used for example in the food industry for cherry pie filling into cans. The shelf life of potato products is increased and they are lightened. The creaminess of cheese is increased. In the baking industry it is used as an emulsifier. Upon addition of calcium hydrogen phosphate, the water content of ham and cooked sausage can be increased. Calcium hydrogen phosphate with monocalcium phosphate and calcium phosphate in the EU as a food additive under the joint number E 341 ( " calcium phosphate " ) approved for certain foods, each with different maximum limits for organic food. After the addition approval regulations, these are - for the most approved phosphates largely uniform - individual specifications for a wide range with many different types of food. The approved maximum amounts vary from 0.5 to 50 grams per kilogram ( in creamer for ATM), or even the lack of a fixed restriction ( quantum satis - as needed, nutritional supplements and partly in chewing gum ). It was determined an allowable daily dose of 70 milligrams per kilogram of body weight for the total amount of recorded phosphoric acid and phosphates.
In smaller quantities it is used for pest control against grain weevils and moths. In homeopathy, it is also known as calcium phos. The drug is used primarily to treat digestive weakness, bone pain and toothache.
It is also used as a feed additive and contained in many fertilizers, calcium preparations and dentifrices.