磷酸二氢钾分子式：KH2PO4| 指标名称 | Name of index | FCC-V | E340(i) | USP-30 | |
| 外观 | Description | Odourless, colourless crystals or white granular or crystalline powder | |||
| 溶解性 | Solubility | -- | Freely soluble in water. Insoluble in ethanol | -- | |
| 鉴别试验 | Identification | Pass test | Pass test | Pass test | |
| pH值 1%水溶液 | pH of a 1 % solution | -- | 4.2—4.8 | -- | |
| 含量（以干基计） | Content(as dry base) | % | ≥90-100 | 90-100 (105℃,4h) | 90-100 (105℃,4h) |
| P2O5含量(无水物) | P2O5 Content(Anhydrous basis) | % | -- | 51.0 –53.0 | -- |
| 水不溶物（无水物） | Water insoluble(Anhydrous basis) | ≤% | 0.2 | 0.2 | 0.2 |
| 有机挥发杂质 | Organic volatile impurities | -- | -- | Pass test | |
| 氟 | Fluoride | ≤ppm | 10 | 10(expressed as fluorine) | 10 |
| 干燥失重 | Loss on drying | ≤% | 1 | 2 (105℃,4h) | 1 (105℃,4h) |
| 重金属 | Heavy metals | ≤ppm | -- | -- | 20 |
| 砷 | As | ≤ppm | 3 | 1 | 3 |
| 镉 | Cadmium | ≤ppm | -- | 1 | -- |
| 汞 | Mercury | ≤ppm | -- | 1 | -- |
| 铅 | Lead | ≤ppm | 2 | 1 | 5 |
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