Ammonium Dihydrogen Phosphate

Ammonium dihydrogen phosphate (MAP), CAS 7722-76-1, is a water-soluble inorganic phosphate supplied as white crystals or crystalline powder. It provides ammonium nitrogen and phosphorus and is used in fertilizer production, flame-retardant formulations and selected food applications. The appropriate grade should be selected according to the intended use and impurity requirements.

Synonym:
Monoammonium Phosphate (MAP); Ammonium Phosphate Monobasic
Appearance:
White crystals or crystalline powder
CAS No.:
7722-76-1
Molecular Formula:
NH₄H₂PO₄
Molecular Weight:
115.03 g/mol
Solubility:
Freely soluble in water

Availability:



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Product Description

Product Description

Product Overview and Grade Selection

Industrial buyers typically compare assay, phosphorus content, nitrogen content, water-insoluble matter and moisture when selecting MAP. Particle size and impurity limits may also affect suitability for a particular process.

Food applications require a dedicated food grade with appropriate impurity controls and supporting documentation. A high assay alone does not establish food-grade suitability.

Ammonium Dihydrogen Phosphate SPECIFICATIONS

ITEM	Specifications
	Industrial grade	Food grade
Appearance	White crystals
Main content	99.0% Min	99.0% Min
Phosphorous Pentoxide	61.0% Min	61.0% Min
Nitrogen as N	11.8% Min	11.8% Min
Water insoluble	0.1% Max	0.05% Max
Moisture	0.1% Max	0.1% Max
Heavy metals (as Pb)	-	0.001% Max
Arsenic (as As)	-	0.0003% Max
Fluoride (as F)	-	0.002% Max
PH	4.4-4.8	4.4-4.8

Applications of Ammonium Dihydrogen Phosphate

1. Fertilizers and Plant Nutrition

MAP supplies nitrogen and phosphorus for fertilizer production. Suitable water-soluble grades are used in fertigation and nutrient solutions. For irrigation applications, water-insoluble matter and compatibility with other fertilizer ingredients should be checked.

2. Flame-Retardant Treatments

Used in flame-retardant formulations for wood, paper and textiles. Performance depends on the treatment formulation, application process and substrate.

3. Dry Chemical Fire-Extinguishing Materials

MAP is a raw material for phosphate-based ABC dry chemical extinguishing powders. Finished extinguishing agents require appropriate formulation and processing to achieve the required performance.

4. Food Processing and Fermentation

Food-grade material is used as a buffering agent, dough conditioner and leavening agent. It may also serve as a nutrient source in fermentation. The selected grade and application must meet the requirements of the destination market.

5. Buffers and Laboratory Applications

Appropriate reagent grades are used in phosphate buffers and analytical solutions. Laboratory applications should use material with a suitable reagent specification.

Packaging and Storage

Packaging

Confirm bag size, inner lining and palletisation requirements when ordering. Package markings should identify the product name, grade, net weight and batch number.

Storage

Store in a cool, dry and well-ventilated area. Keep packaging tightly closed and protect it from moisture, contamination and damage. Follow the storage and handling instructions in the product SDS.

Delivery

Loading arrangements and delivery schedules are confirmed according to order quantity, packaging requirements and destination.

MAP package

Frequently Asked Questions

1. Is ammonium dihydrogen phosphate the same as monoammonium phosphate?

Yes. Both names refer to NH₄H₂PO₄, CAS 7722-76-1. Monoammonium phosphate is commonly abbreviated as MAP.

2. Does 61% P₂O₅ mean the product has only 61% purity?

No. Assay measures the NH₄H₂PO₄ content, while P₂O₅ expresses phosphorus content on an oxide-equivalent basis. They describe different quality parameters.

3. Can industrial-grade MAP be used in food processing?

Food applications require a dedicated food grade with suitable impurity limits and supporting documentation. Industrial-grade assay results alone do not establish food-grade suitability.

4. Can MAP be mixed with calcium fertilizers?

Keep MAP separate from calcium fertilizers in concentrated stock solutions. Concentrated magnesium solutions also require compatibility assessment. Water quality, concentration and pH should be considered when preparing mixtures.

5. What information should buyers check before ordering?

Confirm the grade, assay, water-insoluble matter, moisture, packaging and application-specific impurity limits. Request the relevant product specification, COA and SDS for review.