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Monopotassium Phosphite


Synonyms: Mono potassium phosphite; Potassium phosphite monobasic; MKPO3; Phosphonic acid monopotassium salt; potassium dihydrogen phosphite
CAS No.: 13977-65-6 EC No.:(not available)
Molecular Weight: 120.078
Molecular Formula: KH2PO3
Structural Formula:monopotassium phosphite


Monopotassium phosphite can be obtained by neutralization reaction between phosphorous acid (H3PO3) and potassium hydroxide (or potassium carbonate)




1) Monopotassium phosphite is used in formulation of foliar fertilizer and water-soluble fertilizer.
2) Monopotassium phosphite is used as fungicide to control Oomycetes (esp. Phytophthora sp), similar to fosetyl aluminium (Aliette).


Monopotassium Phosphite Content 98.0% min.
K2O 38.4%
P2O5 57.9%
Moisture 2.0% max.
Chloride (Cl) 0.0005% max.
Iron (Fe) 0.0005% max.
Pb 0.001% max.
As 0.001% max.
Cd 0.0005% max.
Insolubles in water 0.01% max.
pH Value 3.9~4.2
Appearance white crystalline powder

Standard Packaging

25kgs/Kraft Paper Bags, 18~24mt/20’FCL; 5kg/bag;1000kg/super sack

Monopotassium Phosphite

Risks and Safety Information

REACH Substance Certified

Monopotassium phosphite is not regulated by UN as hazardous substance
For more information, please refer to MSDS.

No hazard

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