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Home> Encyclopedia >Phosphate>Phosphate Fertilizer>Pharmaceutical Intermediates
Ammonium phosphate dibasic structure
Ammonium phosphate dibasic structure

Ammonium phosphate dibasic

Iupac Name:diazanium hydrogen phosphate
CAS No.: 7783-28-0
Molecular Weight:132.056221
Modify Date.: 2022-11-10 19:30
Introduction: Ammonium phosphates includemono- and diammonium orthophosphatesand ammonium polyphosphates. As discussed below, theseare made directly by reaction anhydrous ammonia withorthophosphoric acid or superphosphoric acid. Both aredry crystalline materials with good handling properties. View more+
1. Names and Identifiers
1.1 Name
Ammonium phosphate dibasic
1.2 Synonyms

Ammonium hydrogen phosphate (2:1:1) Diammonium hydrogen phosphate Diammonium hydrogenphosphate diazanium,hydrogen phosphate EINECS 231-987-8 MFCD00010891 phos-chek202 phos-chek259 phosphatedibasiqued’ammonium Phosphoricacid,diammoniumsalt PHOSPHORUS ICP STANDARD SEC AMMONIUM PHOSPHATE SEC-AMMONIUM HYDROGEN PHOSPHATE secondaryammoniumphosphate

1.3 CAS No.
1.4 CID
1.6 Molecular Formula
H9N2O4P (isomer)
1.7 Inchi
1.8 InChkey
1.9 Canonical Smiles
1.10 Isomers Smiles
2. Properties
2.1 Density
1.203 g/mL at 25 °C
2.1 Melting point
155 °C (dec.)(lit.)
2.1 Boiling point
158 °C at 760 mmHg
2.1 Refractive index
2.1 Precise Quality
2.1 PSA
2.1 logP
2.1 Solubility
58 g/ 100mL (10 oC)
2.2 Appearance
White Crystalline Powder
2.3 Storage
Ambient temperatures.
2.4 Chemical Properties
It appears as colorless transparent monoclinic crystal or white powder, being soluble in water, insoluble in alcohol, acetone and ammonia.
2.5 Color/Form
White crystals
Crystals or crystalline powder
2.6 Contact Allergens
A flame retardant caused contact dermatitis in surgical personnel. It was due to excessive residual concentrations in surgical garbs.
2.7 Decomposition
When heated to decomposition emits very toxic fumes ... of /phosphorus oxides, nitrgen oxides, and ammonia/.
2.8 Odor
2.9 PH
pH about 8
2.10 Water Solubility
58 g/ 100mL (10 oC)
2.11 Spectral Properties
2.12 Stability
Stable. Incompatible with strong acids, strong bases, strong oxidizing agents.
2.13 StorageTemp
Store at RT.
3. Use and Manufacturing
3.1 Agricultural Uses
With excess ammonia, the technical grade of diammonium phosphate (DAP) contains 16 to 18% nitrogen and 20to 21 % phosphorus. DAP is an important fertilizer as well as an intermediate in the production of complex fertilizers and bulk blends.
3.2 Definition
ChEBI: An inorganic phosphate, being the diammonium salt of phosphoric acid.
3.3 Potential Exposure
Used in fireproofing of textiles; woodand paper; in soldering flux; as a fertilizer; a buffer; inbaking powder and food additives.
3.4 Shipping
There are no DOT/UN listed requirements.
3.5 Usage
(1) Diammonium phosphate is industrially used as feed additives, flame retardants and the ingredients of the fire extinguishing agent.(2) It can be used as analysis reagents and buffer(3) It is a widely applicable efficient fertilizer for vegetables, fruits, rice and wheat.(4) It can be used as water softeners; yeast foodstuffs, and so on.(5) In the food industry, it can be used as food leavening agent, dough regulator, yeast food, brewing fermentation additives as well as being used as a buffer.(6) It can be used as ruminant feed additives.(7) It can be used for printing plate, medicine, fire prevention, electronic tubes.(8) Fertilizer level is mainly used for high concentrations nitrogen and phosphorus compound fertilizer. The industrial grade can be used for impregnation of wood and fabric to increase its durability; it can be used as dry powder fire extinguishing agent, fluorescent phosphor; also used for the manufacturing of printing plate, tube, ceramic and china, wastewater biochemical treatment; military use it as the flame retardants of rocket engine motor insulation materials.
3.6 Waste Disposal
May be flushed to sewer withhuge volumes of water. Ammonium phosphate dibasic Preparation Products And Raw materials Raw materials
4. Safety and Handling
4.1 Hazard Codes
4.1 Risk Statements
4.1 Safety Statements
4.1 Exposure Standards and Regulations
The food additive diammonium phosphate may be safely used in ruminant feed in accordance with the following prescribed conditions: (a) The food additive is the product resulting from the neutralization of feeding-phosphoric-acid or defluorinated wet-process phosphoric acid with anhydrous ammonia ... contains not less than 106.25% equivalent crude protein (nitrogen X 6.25) and 20% phosphorus contains not more than 1 part fluorine to 100 parts phosphorus, 75 ppm arsenic (as As), 30 ppm heavy metals, as lead (Pb); (b) It is used in ruminant feeds as a source of phosphorus and nitrogen in an amt that supplies not more than 2% of equivalent crude protein in the total daily ration.
Ammonium phosphate (mono-, and dibasic) used as a general purpose food additive in animal drugs, feeds, and related products is generally recognized as safe when used in accordance with good manufacturing or feeding practice. /Ammonium phosphate (mono-, and dibasic)
Substance added directly to human food affirmed as generally recognized as safe (GRAS).
4.2 Other Preventative Measures
SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.
4.3 Cleanup Methods
Stop discharge if possible. Keep people away. Avoid contact with solid and dust. Isolate and remove discharged material. Notify health and pollution control agencies.
4.4 DisposalMethods

SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

UN 3465 6.1 / PGIII
4.5 FirePotential
4.6 Safety Profile
Low to moderatetoxicity. See also PHOSPHATES. Whenheated to decomposition it emits very toxicfumes of POx, NOx, and NH3.
4.7 Formulations/Preparations
Grades: technical; CP /chemically pure: a grade designation signifying a minimum of impurities, but not 100% purity/; fertilizer; feed; dentifrice; highly purified, for phosphors; FCC /Food Chemicals Codex/.
The grade used medicinally is 98-99% pure.
Fertilizer grade, min 18% N, 46% P.
4.8 Incompatibilities
Incompatible with oxidizers (chlorates,nitrates, peroxides, permanganates, perchlorates, chlorine,bromine, fluorine, etc.); contact may cause fires or explosions.Keep away from alkaline materials, strong bases,strong acids, oxoacids, epoxides. Contact with air causesthis chemical to produce anhydrous ammonia fumes.
4.9 WGK Germany
4.9 Protective Equipment and Clothing
Dust irritating to eyes, and throat. Solid irritating to skin and eyes.
4.10 Skin, Eye, and Respiratory Irritations
Dust irritating to eyes, and throat. Solid irritating to skin and eyes.
4.11 Toxicity
LD50 orally in Rabbit: 6500 mg/kg LD50 dermal Rabbit > 7950 mg/kg

2.Hazard identification

2.1 Classification of the substance or mixture

Not classified.

2.2 GHS label elements, including precautionary statements

Pictogram(s) No symbol.
Signal word

No signal word.

Hazard statement(s)


Precautionary statement(s)








2.3 Other hazards which do not result in classification


7. Other Information
7.0 Usage
Ammonium hydrogen phosphate is used as a fertilizer, as a fire retardant, as a yeast nutrient in winemaking and brewing mead, as an additive in some brands of cigarettes, in purifying sugar and to control precipitation of alkali-soluble and acid-insoluble colloidal dyes on wool.
7.1 Usage
It is commonly used in fertilizer as plant food as well as a yeast nutrient. Ammonium phosphate dibasic has been used to prepare multi-shell nanoparticles to increase transfection efficiency.
7.2 Usage
Ammonium hydrogen phosphate is commonly used as a fertilizer. It can be used as fire retardant, in fireproofing textiles, paper and wood. It finds applications in vegetable fibers, impregnating lamp wicks, soldering metals, purifying sugar, in yeast cultures and corrosion inhibitors. It is used in the treatment of carbonate stones used in architectural, cultural heritage and optical materials. It is also used as a flux for soldering copper, tin and zinc.
8. Computational chemical data
  • Molecular Weight: 132.056221g/mol
  • Molecular Formula: H9N2O4P
  • Compound Is Canonicalized: True
  • XLogP3-AA: null
  • Exact Mass: 132.02999377
  • Monoisotopic Mass: 132.02999377
  • Complexity: 46.5
  • Rotatable Bond Count: 0
  • Hydrogen Bond Donor Count: 3
  • Hydrogen Bond Acceptor Count: 4
  • Topological Polar Surface Area: 85.4
  • Heavy Atom Count: 7
  • Defined Atom Stereocenter Count: 0
  • Undefined Atom Stereocenter Count: 0
  • Defined Bond Stereocenter Count: 0
  • Undefined Bond Stereocenter Count: 0
  • Isotope Atom Count: 0
  • Covalently-Bonded Unit Count: 3
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