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Ammonium dihydrogen phosphate

description Chemical properties Solubility in water(g/100ml) Content analysis Toxicity Application Preparation method References
Ammonium dihydrogen phosphate
Ammonium dihydrogen phosphate structure
Chemical Name:
Ammonium dihydrogen phosphate
Molecular Formula:
Formula Weight:
MOL File:

Ammonium dihydrogen phosphate Properties

Melting point:
190 °C (dec.)(lit.)
Boiling point:
87.4 °C
1.02 g/mL at 20 °C
vapor pressure 
0.066 hPa (125 °C)
storage temp. 
H2O: 0.1 M at 20 °C, clear, colorless
Specific Gravity
White or colorless
3.8-4.4 (25℃, 50mg/mL in H2O)
PH Range
3.8 - 4.4
Water Solubility 
368 g/L (20 ºC)
λ: 260 nm Amax: ≤0.059
λ: 280 nm Amax: ≤0.050
CAS DataBase Reference
7722-76-1(CAS DataBase Reference)
EPA Substance Registry System
Monoammonium phosphate (7722-76-1)
  • Risk and Safety Statements
Hazard statements  H315-H319-H335
Precautionary statements  P261-P280a-P304+P340-P305+P351+P338-P405-P501a
Hazard Codes  Xi
Risk Statements  36/37/38
Safety Statements  24/25-36-26
WGK Germany  1
HazardClass  8
PackingGroup  III
HS Code  31054000
Toxicity LD50 orally in Rabbit: 5750 mg/kg LD50 dermal Rabbit > 7940 mg/kg

Ammonium dihydrogen phosphate price More Price(35)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 09709 Ammonium phosphate monobasic BioUltra, ≥99.5% (T) 7722-76-1 50g $86.2 2019-12-02 Buy
Sigma-Aldrich 09709 Ammonium phosphate monobasic BioUltra, ≥99.5% (T) 7722-76-1 1kg $134 2019-12-02 Buy
Alfa Aesar 010633 Ammonium dihydrogen phosphate, Puratronic?, 99.995% (metals basis) 7722-76-1 25g $118 2019-12-02 Buy
Alfa Aesar 010633 Ammonium dihydrogen phosphate, Puratronic?, 99.995% (metals basis) 7722-76-1 100g $425 2019-12-02 Buy
Strem Chemicals 02-0500 Ammonium dihydrogen phosphate (99.998%) PURATREM 7722-76-1 50g $145 2019-12-02 Buy

Ammonium dihydrogen phosphate Chemical Properties,Uses,Production


Ammonium dihydrogen phosphate (ADP) is a transparent, piezoelectric crystal containing no water of crystallization. Single crystals of this material were originally developed for use in underwater sound projectors and hydrophones. Transducer problems during World War II fostered a joint study program on this material by Bell Telephone Laboratories, Brush Development Company and the Naval Research Laboratories. An adequate and relatively simple technology was developed in this joint effect to grow ADP crystals and to fabricate them into sonar transducers. ADP is comparable to ordinary table salt in workability, brittleness and solubility. Blumenthal was one of the first investigators to demonstrate the successful microwave modulation of light by using the electrooptic effect in ADP.

Chemical properties

colorless transparent tetragonal crystal. soluble in water, slightly soluble in alcohol, insoluble in acetone.

Solubility in water(g/100ml)

Dissolving grams per 100 ml of water at different temperatures (° C):
22.7 g/0 ° C; 39.5 g/10 ° C; 37.4 g/20 ° C; 46.4 g/30 ° C; 56.7 g /40 ° C; 82.5 g/60 ° C; 118 g/80 ° C; 173 g/100 ° C

Content analysis

Accurately weighed about 500mg sample, dissolved in 50ml of water, with 0.1mol/L sodium hydroxide titration to pH 8.0. per mL, 0.1mol/L sodium hydroxide is equivalent to diammonium phosphate [NH4H2PO4] 11.50 mg.


ADI: 0 to 70 mg/kg (amount of total phosphate as phosphorus; FAO/WHO, 2001).
GRAS (FDA, § 184.1141a, 2000).


Leavening agent, dough regulator, yeast food, brewing fermentation additives and buffer in the food industry
Animal feed additives
Nitrogen and phosphorus compound fertilizer with highly efficient
Fire retardant for wood, paper, fabric, dispersant for fiber processing and dyeing industry, glaze for enamel, cooperating agent for fire retardant coating, decontamination agent for match stalk and candle core
In indurstis of printing plate and pharmaceutical manufacturing

Preparation method

Venturi loop reaction method: 85% thermal phosphoric acid will be diluted 1.3 to 1.4 times, after the measurement into the venturi tube flow mixing reactor, where it is sufficiently homogeneously mixed and reacted with the incoming ammonia gas, and the reaction process is continued in the pipeline. Finally the qualified liquid enters into the cycle reaction tank, adjusting the Ph value between the range 4.4 to 4.6, filtering and cooling the filtrate down to 26 oC, obtaining the crystal solid, separating and dehydrating, and then drying it to obtain the dihydrogen phosphate Ammonium products.
H3PO4 + NH3 → NH4H2PO4
Neutralization method: firstly dilute the phosphoric acid to get a solution with 50% to 55% concentration, and then take some measured solution into an enamel reaction tank with stirring and jacket. In stirring, the ammonia gas is slowly added into the ammonia tube distributor for neutralization. Waiting till the Ph value of the neutralized solution gets between 4.2~4.6, filter it immediately and send it into the cooling crystallization mold, then obtain crystallization when the temperature gets down to 26 °. Dry after dehydration and then obtain ammonium dihydrogen phosphate products.
 H3PO4 + NH3 → NH4H2PO4
Mother liquor from separator is added into the iron remover with ammonium sulfide for removing iron, filtering, and then senting to the acid tank to adjust the acidity to Ph4.4~4.6. Refined mother liquor is supplied for recycling.
Metathesis method Calcium dihydrogen phosphate and ammonium sulfate were melted at 85-90 °C to produce a clear solution below the saturation concentration. Firstly, the calcium dihydrogen phosphate solution is added into the reactor, and the temperature of the steam is raised to 95 oC under stirring, and the ammonium sulphate solution is added slowly for metathesis reaction to produce ammonium dihydrogen phosphate and calcium sulphate. The end point of the reaction is that Ph value is about 4.4 to 4.6. After filtration, the filtrate is sent into the evaporator to the boiling point of 108 °C, and then is sended into the cooling crystallizer, cooling to 40 °C for crystallization, centrifugal separating, drying, and then obtaining ammonium dihydrogen phosphate product.
Ca (H2PO4) 2 H2O + (NH4) 2SO4 → This product + CaSO4 + H2O
The separated calcium sulfate is filtered and washed to produce a by-product. The lotion is returned for the feed.


Chemical Properties

Ammonium phosphate occurs in two forms-the monobasic, NH4H2P04, and dibasic,(NH4)2HP04, forms, It is a white crystalline solid that is soluble in water. Ammonium phosphate is a product of the reaction between ammonia and phosphoric acid.Ammonium phosphate is an important fertilizer and is used as a fire retardant

Chemical Properties

Ammonium phosphate is a white crystalline or powdery substance.


Used as buffer solutions.


As baking powder with sodium bicarbonate; in fermentations (yeast cultures, etc.); fireproofing of paper, wood, fiberboard, etc.


Ammonium dihydrogen phosphate is a general purpose food additive which is readily soluble in water. A 1% solution has a ph of 4.3–5.0. It is used as a dough strengthener and leavening agent in baked goods and as a firming agent and ph control agent in condiments and puddings. It is also used in baking powder with sodium bicarbonate and as a yeast food.


ChEBI: The ammonium salt of phosphoric acid (molar ratio 1:1).

Agricultural Uses

Ammonium phosphates refer to a generic class of phosphorus fertilizers and are manufactured by reacting anhydrous ammonia with orthophosphoric acid or superphosphoric acid. These are either in solid or liquid form.
Ammonium phosphate fertilizers are highly soluble in water and fast acting in soil to give nitrogen and phosphorus in a chemical combination. They form an important base for many compound fertilizers. Both mono and diammonium phosphates have good physical properties when synthesized from the wetprocess phosphoric acid. Storage properties and the ease of granulation depends on the amount of impurities, which form a gel like structure (mainly aluminum and iron phosphates). This gel promotes granulation and serves as a conditioner to prevent caking even at moderately high moisture levels. A small proportion of phosphate rock added to phosphoric acid before ammoniation improves the granulation.
Ammonium phosphates, particularly diammonium phosphates (DAP), are the most popular phosphate fertilizers worldwide because of their high utility and good physical properties. The standard commodity grade of diammonium phosphate is 18-46-0. Pure and completely soluble ammonium phosphates are used mainly as liquid fertilizers. In Britain, diammonium phosphate is not sold directly in this form, but is used to make compound fertilizers with a wide variety of plant foods. DAP contains 21 % nitrogen and 23 % phosphorus(54% P2O5).
Diammonium phosphate is unstable at temperatures above 150℃ while monoammonium phosphate remains stable even at much higher temperatures. These two fertilizers usually form a part of concentrated compound fertilizers and are rarely used individually in their pure states. Granular DAP is commonly produced by a slurry process, developed by TVA (Tennessee Valley Authority) or the Jacobs-Dorrco Industrial Process. In the wet process, acid of about 40% phosphorus pentoxide (P2O5) is reacted with ammonia in a preneutralizer where the mole ratio of NH3:H3PO4 is controlled at about 1.4. The heat of the reaction raises the slurry temperature to boiling point (about 115°C). The hot slurry containing about 16 to 20% water is pumped into the granulator, where more ammonia is added to increase the molar ratio to approximately 2.0. Moist granules are dried, screened and cooled, while the undersized and crushed oversized ones are recycled. Escaping ammonia is recovered by scrubbing with weak acid. The same equipment is used to produce monoammonium phosphate, wherein the preneutralizer is operated at a molar ratio of about 1.4. The phosphoric acid is then added into the granulator to decrease the ratio to 1.0.
Pure monoammonium phosphate is completely water-soluble and contains 12% nitrogen and 21% phosphorus (as 52% P2O5). The production of nongranular monoammonium phosphate has been achieved by a number of processes developed for use as an intermediate in the production of complex fertilizers, by Scottish Agricultural Industries, Fison's Ltd., Swift Agricultural Chemicals, Nissan and ERT Espindesa to name a few. In general, all processes aim at a simple, low cost method by eliminating granulation, recycling and drying. Though the production of powdered monoammonium phosphate is on the decline, it is still in use because of its high phosphorus content (as P2O5).
In addition, a group of fertilizers, such as ammonium phosphate-sulphates, ammonium phosphate-chloride and ammonium phosphate-nitrate are produced by a number of processes involving the neutralization of ammonia with a mixture of phosphoric acid and plant waste acids like sulphuric acid, nitric acid or hydrochloric acid. These fertilizers are free flowing and non-hygroscopic (or less hygroscopic) compared to the individual components, and have been successfully used in many types of soils.

Agricultural Uses

MAP is short for monoammonium phosphate.
Marathon-Howard process for chemical recovery A treatment of waste sulphite liquor from sulphite pulp manufacture to recover chemicals and reduce stream pollution is known as Marathon-Howard process.
Waste sulphite is treated with lime which precipitates out as (a) calcium sulphite for use in preparing fresh cooking acid for the sulphite pulp process, and (b) a basic calcium salt of lignin sulphonic acid which can be pressed and used as a fuel or raw material for vanillin, lignin, plastics and other chemicals. The remaining liquor, with its biological oxygen demand reduced to 80%, is the effluent.

Agricultural Uses

Solid or liquid phosphorus fertilizers are manufactured by reacting anhydrous ammonia with orthophosphoric acid or superphosphoric acid. Anhydrous ammonia added to liquid phosphoric acid gives monoammonium phosphate (MAP), a phosphorus fertilizer, which contains about 11% nitrogen and 21% phosphorus.
Pure monoammonium phosphate is completely water soluble and contains 12 % nitrogen and 21% phosphorus (52% P2O5 ). Monoammonium phosphate is prepared popularly by the ERT Espindesa process.

Potential Exposure

Used in fireproofing of textiles; wood and paper; in soldering flux; as a fertilizer; a buffer; in baking powder and food additives.


There are no DOT/UN listed requirements.

Purification Methods

Crystallise it from water (0.7mL/g) between 100o and 0o.


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 causes this chemical to produce anhydrous ammonia fumes.

Waste Disposal

May be flushed to sewer with huge volumes of water.

Ammonium dihydrogen phosphate Preparation Products And Raw materials

Raw materials

Preparation Products

Ammonium dihydrogen phosphate Suppliers

Global( 420)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21791 58
Jiangsu Kolod Food Ingredients Co.,Ltd.
+86-518-85110578 18805133257
+86-518-85110578 CHINA 100 60
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 22631 55
Hangzhou FandaChem Co.,Ltd.
0086 158 5814 5714 (Mobile
+86-571-56059825 CHINA 2983 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 1892 55
Shanghai Zheyan Biotech Co., Ltd.
18017610038 CHINA 3623 58
career henan chemical co
+86-371-86658258 CHINA 30057 58
Hubei Jusheng Technology Co.,Ltd.
027-59599243 CHINA 28235 58
Haihang Industry Co.,Ltd
+86 531 8582 1093 CHINA 8721 58
hdzhl biotechnology co., ltd
86-13032617415 CHINA 1278 58

View Lastest Price from Ammonium dihydrogen phosphate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-19 Ammonium dihydrogen phosphate
US $1.00 / kg 1kg 99% 500kg career henan chemical co
2017-08-30 Ammonium Dihydrogen Phosphate; Monoammonium Phosphate
US $20.00 / KG 25KG 96.0%---102.0% 200 tons Jiangsu Kolod Food Ingredients Co.,Ltd.

Ammonium dihydrogen phosphate Spectrum

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