Disodium hydrogen phosphate dodecahydrate
CAS 10039-32-4
EC 600-088-6
Formula H3O4P.12H2O.2Na
MW 358.14 g/mol
Salts & Minerals Water TreatmentFood & NutritionPharmaceuticals & Healthcare Chelation & SequestrationpH Regulation & BufferingAntioxidant & Stabilizer
Description
Disodium hydrogen phosphate dodecahydrate (DSP, Na2HPO4·12H2O) is the fully hydrated disodium salt of phosphoric acid, supplied as white crystals under CAS 10039-32-4. It carries no E-code designation and is catalogued under EC 600-088-6. It is also commonly referred to simply as disodium hydrogen phosphate or disodium phosphate.
In water treatment, DSP raises pH and precipitates calcium and magnesium ions, reducing scale formation in boilers and cooling systems. In pharmaceutical manufacturing, it functions as a buffering agent in parenteral formulations, maintaining solution pH within tight physiological limits. Food-grade applications include sequestering metal ions in dairy and processed foods to prevent oxidative degradation.
DSP dodecahydrate is available in technical, food-grade (FCC), and pharmaceutical-grade (Ph.Eur.) specifications to meet sector-specific compliance requirements. The product falls under REACH regulation and is classified under HS code 28352200. Packaging options typically include 25 kg bags and bulk quantities depending on grade.
In water treatment, DSP raises pH and precipitates calcium and magnesium ions, reducing scale formation in boilers and cooling systems. In pharmaceutical manufacturing, it functions as a buffering agent in parenteral formulations, maintaining solution pH within tight physiological limits. Food-grade applications include sequestering metal ions in dairy and processed foods to prevent oxidative degradation.
DSP dodecahydrate is available in technical, food-grade (FCC), and pharmaceutical-grade (Ph.Eur.) specifications to meet sector-specific compliance requirements. The product falls under REACH regulation and is classified under HS code 28352200. Packaging options typically include 25 kg bags and bulk quantities depending on grade.
Physical Properties
| Melting Point | 35 °C |
| Density | 1,52 g/cm 3 |
| Appearance | white crystals |
| Color | White |
| Odor | Odorless |
| Form | Crystals |
| Water Solubility | 218 g/L (20 ºC) |
| pH | 9.0-9.3 (25℃, 50mg/mL in H2O) |
Trade & Regulatory
| HS Code | 28352200 |
| UN Number | 3077 |
| ADR Class | 9 |
| Packing Group | III |
| WGK (Germany) | 1 |
Other Names
Dibasic Dodecahydratesodium PhosphateDisodium orthophosphate, dodecahydrateSodium phosphate, dibasic, dodecahydrateDSPDISODIUM HYDROGEN PHOSPHATEDINATRII PHOSPHAS DODECAHYDRICUSDisodium phosphate dodecahydrateDisodium phosphate (Na2HPO4.12H2O)DI-SODIUM HYDROGEN PHOSPHATE 12H20
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Derivatives
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