Registration Dossier
Registration Dossier
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EC number: 266-030-3 | CAS number: 65996-95-4 Substance obtained by acidulating phosphate rock with phosphoric acid. Normally characterized as containing 40% or more available phosphoric oxide (P2O5). Composed primarily of calcium phosphate.
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
The water solubility of Triple superphosphate is based on its two main constituents (data from handbooks): Calcium phosphate monobasic (MCP) is soluble as the monohydrate. Calcium sulfate is soluble in case of granular or powdered anhydrous form or as dihydrate. Therefore triple superphosphate has a water solubility of 1 -100 g/L.
Key value for chemical safety assessment
- Water solubility:
- 1 g/L
Additional information
Based on the handbook data available, the two main constituents of triple superphosphate:
Calcium sulfate anhydrous is insoluble to slightly soluble in water (crystal structure as the mineral) or is soluble (granular or powder). Calcium sulfate dihydrate is soluble in water (2 g/l at 20°C).
Calcium phosphate monobasic (MCP) anhydrous is slightly soluble in water. The monohydrate is soluble in water. The SIDS mentions 18 g/L, and CRC reports an even higher value. Superphosphate from the H2SO4 treatment contains the monohydrate (Merck 12th).
Two minor constituents of triple superphosphate:
Calcium phosphate dibasic (anhydrous and dihydrate): insoluble in water (< 0.1 mg/L).
Phosphate rock is not expected to dissolve in water
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