Магний-дигидрофосфат

Description

Magnesium dihydrogen phosphate (magnesium dihydrogen orthophosphate, monosubstituted magnesium phosphate, Mg(H2PO4)2) is an acidic magnesium salt of orthophosphoric acid. It belongs to the class of inorganic metal phosphates and, along with magnesium hydrogen phosphate and orthophosphate, is included in a series of magnesium salts of different basicity. The acidic nature of the salt (low pH of the aqueous solution) distinguishes it from intermediate and basic magnesium phosphates and determines its use as a source of available magnesium and phosphorus.

Basic Attributes

• CAS No.: 13092-66-5
• Chemical formula: H3O4P.1/2Mg (Mg(H2PO4)2)
• Molecular weight: 290.34
• Exact weight: 217.923
• EU number: 236-004-6
• UNII:AA2L7VX59K
• DSSTox ID: DTXSID00872542
• PSA specifications: 180.80000
• XLogP3: -0.98080

Physico-chemical characteristics

• Appearance: liquid
• Density: 1.56 g/cm3 at 20 °C
• Boiling point: 158 °C at 760 mmHg. Art.
• Solubility in water: soluble in water and acids, insoluble in alcohol

GHS classification

Hazard Category: H318 (100%) - Causes serious eye damage. Risk of serious eye damage/eye irritation. The class reflects the acidic reaction of an aqueous salt solution: upon contact with the mucous membrane of the eye, the acidic environment causes a chemical burn, so handling requires face protection, regardless of the concentration of the working solution.

Related compounds

In the series of magnesium phosphates, dihydrogen phosphate is the most acidic, monosubstituted form. The middle salt (magnesium hydrogen phosphate) and basic magnesium orthophosphate are less soluble and are used differently - mainly as fire retardants and fillers. Dihydrogen phosphate, on the contrary, is highly soluble in water and acids, which determines its use in liquid fertilizer and buffer compositions.

Scope of application

Magnesium dihydrogen phosphate is used as a source of magnesium and phosphorus in the composition of mineral and liquid fertilizers, where the combination of these elements in one molecule accelerates the absorption of both macroelements by plants and reduces the number of individual technological operations when mixing fertilizer compositions. In the food industry, compounds of this type are used as an acidity regulator and a mineral additive that enriches the product with magnesium and phosphorus. In inorganic chemistry and laboratory practice, magnesium phosphate acts as a buffer component of solutions and an intermediate raw material for the production of other magnesium phosphates - hydrogen phosphate and orthophosphate.

• liquid and complex mineral fertilizers (source of Mg and P)
• acidity regulator and mineral additive in food compositions
• buffer component of laboratory and technological solutions
• raw materials for the production of other magnesium phosphates
• component of formulations for correcting magnesium and phosphorus nutrition of plants

Precautions and storage

The substance causes serious eye damage (H318, 100%), therefore eye and face protection and gloves resistant to acidic aqueous solutions are required when working. Store in an airtight container in a cool, dry place, avoiding contact with eyes and mucous membranes when pouring and dosing. In case of spillage, the product is diluted with a large amount of water and neutralized according to the internal regulations of the enterprise.