CAS No.: [7778-77-0]
Alias: MKP, Potassium Phosphate Monobasic
Molecular Formula: KH₂PO₄ Relative molecular mass:136.08
Structural Formula:
1. Product Property
Potassium dihydrogen phosphate (food grade) is a white, crystalline powder or granules, highly soluble in water but insoluble in ethanol. It is odorless and has a slightly acidic taste. As a food additive, it acts as a buffering agent, stabilizer, and nutrient supplement (e.g., for potassium and phosphorus). It is non-toxic, hygroscopic in humid conditions, and thermally stable under normal processing temperatures. Its aqueous solution is weakly acidic (pH ~4.5 at 1% solution).
2. Quality Standards
| Parameter | Specification (Food Grade) |
| Assay (KH₂PO₄) | ≥ 98.0% |
| Loss on Drying | ≤ 0.5% |
| Heavy Metals (as Pb) | ≤ 10 mg/kg |
| Arsenic (As) | ≤ 3 mg/kg |
| Fluoride (F) | ≤ 10 mg/kg |
| Lead (Pb) | ≤ 2 mg/kg |
| pH (1% solution) | 4.2–4.6 |
3. Application scope and Usage
KH₂PO₄ (food grade) is widely used in the food industry as an acidity regulator, emulsifier, and nutrient fortifier. It enhances texture in processed meats, prevents oxidation in beverages, and stabilizes dairy products like cheese. In baking, it acts as a leavening agent. It’s also added to sports drinks for electrolyte balance. Typical usage levels range from 0.1% to 0.5% by weight, complying with local regulatory limits (e.g., FDA 21 CFR 182.1087).
4. Package and Storage
The product is packaged in food-grade polyethylene-lined woven bags (25 kg/bag) or customized containers (e.g., 1-ton bulk bags). Store in a cool, dry, well-ventilated area away from moisture, strong acids, and alkalis. Ensure containers are tightly sealed to prevent caking due to hygroscopicity. Shelf life is typically 24 months when stored below 25°C and at relative humidity <60%. Avoid direct sunlight and contamination during handling.
