Monopotassium phosphate

Monopotassium phosphate (CAS 7778-77-0), commonly sourced as MKP or E340i, is an inorganic potassium salt used as a pH buffer, nutrient source, and sequestrant.

Where is Monopotassium phosphate used?

• Food and beverage: buffering agent in sports drinks, dairy products, and processed foods where pH consistency affects shelf life and texture
• In bakery products, used as a leavening agent, flavoring agent, fermentation additive, nutritional fortifier, and in yeast-based foods; also as a buffer and chelating agent.
• Pharmaceutical: buffer solutions and excipient in oral preparations
• Water treatment: corrosion inhibition by controlling mineral scaling and sequestering metal ions
• Fertilizer producers and hydroponic growers rely on it as a fully water-soluble NPK input.
• Suitable for fertigation systems that do not require nitrogen addition.
• Can be applied as a foliar fertilizer to supply phosphorus and potassium.
• Used in cleaners and detergents for buffering properties.

Formulation notes

• Incompatible with fertilizers containing calcium or magnesium; two tanks must be used for combined application.
• Foliar application of 1% mixed with systemic fungicides improves fungicide efficacy and allows reduced doses.
• For foliar spraying, use 100-300 g per 100 liters of water.
• Iron, manganese, zinc and copper must be present in chelated form when mixed with monopotassium phosphate.

Typical specification

• Purity of at least 98%.
• Fertilizer-grade powder contains 52% P2O5 and 34% K2O, labeled NPK 0-52-34.
• Moisture content 0.2% maximum.

Regulatory status

• It is an EC fertilizer (ABONO CE).
• It is not subject to transport regulations (no UN number assigned).
• It complies with Ph.Eur., USP, and BP pharmacopoeia standards.

Storage, packaging and handling

• Store containers between 5 and 35 °C in a dry, well-ventilated place.
• Should be protected from rain, moisture and prolonged exposure to humidity.

Frequently asked questions about Monopotassium phosphate

How does monopotassium phosphate differ from MAP 12-61-0?

Unlike MAP 12-61-0, monopotassium phosphate 0-52-34 contains no nitrogen and supplies both phosphorus and potassium.

Is monopotassium phosphate corrosive to irrigation equipment?

Unlike phosphoric acid, monopotassium phosphate is only moderately acidic and therefore not corrosive to pumps or irrigation equipment.

Technical content is compiled and updated by the SoleChem product team from public technical sources; the certificate of analysis (COA) governs product-specific specifications.