Registration Dossier
Registration Dossier
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EC number: 231-767-1 | CAS number: 7722-88-5
Endpoint summary
Administrative data
Description of key information
Additional information
Typically the purity of tetrasodium pyrophosphate is > 90% (dry weight, after excluding water). All impurities present at >1% are other inorganic phosphates or other related inorganic substances, similar to the registered substance, and which do not significantly affect its toxicological and ecotoxicological properties. There are no hazardous impurities present within the substance at levels >0.1%.
Tetrasodium pyrophosphate has a melting point of >800°C and is considered to be very soluble (58 g/l of solution at 20.0 ± 0.5°C). The pH of this solution, observed in the water solubility study, was pH 9.8-9.9. The water solubility study conducted on tetrasodium pyrophosphate made the following observations:
The effect of
temperature over the range 10 to 30°C has been considered to have had a
significant influence on the solubility of the test material.
An assessment of the solubility of the test material over the
environmentally relevant pH range of 4 to 9 gave final solution pH and
solubility results similar to those obtained using unbuffered water.
Thus, it can be anticipated that the water solubility of the test
material over the pH range 4 to 9 would be constant, essentially due to
the low buffering activities seen in the environment.
Tetrasodium pyrophosphate is not considered to possess any of the following hazardous physico-chemical properties: autoflammability and/or self-ignition, flammability, explosiveness and oxidising properties.
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