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Registration Dossier
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EC number: 267-956-0 | CAS number: 67953-76-8
Water solubility
Administrative data
Link to relevant study record(s)
- Endpoint:
- water solubility
- Type of information:
- other: Data from MSDS
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- secondary literature
- Principles of method if other than guideline:
- No information
- Type of method:
- other: None reported
- Remarks on result:
- completely miscible
- Remarks:
- The substance was reported as miscible in water
- Conclusions:
- The substance was reported as miscible in water in a MSDS.
- Endpoint:
- water solubility
- Type of information:
- other: Data from MSDS
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- secondary literature
- Principles of method if other than guideline:
- No information
- Type of method:
- other: None reported
- Water solubility:
- >= 530 g/L
- Temp.:
- 20 °C
- pH:
- ca. 7 - ca. 8.5
- Remarks on result:
- completely miscible
- Remarks:
- The substance was reported as fully miscible in water. Based on concentration of 39-43% at 20°C and solution density of 1.36 g/cm3 at 20°C, the equivalent water solubility in g/L using density and concentration is reported as ≥530 g/L.
- Conclusions:
- The substance was reported as fully miscible in water. Based on concentration of 39-43% at 20°C and solution density of 1.36 g/cm3 at 20°C, the equivalent water solubility in g/L using density and concentration is reported as ≥530 g/L.
- Endpoint:
- water solubility
- Type of information:
- other: Data from MSDS
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- secondary literature
- Principles of method if other than guideline:
- No information
- Type of method:
- other: None reported
- Water solubility:
- ca. 230 - ca. 280 g/L
- Temp.:
- 20 °C
- pH:
- ca. 5.8 - ca. 6.5
- Remarks on result:
- completely miscible
- Remarks:
- The substance was reported as fully miscible in water. Based on concentration of 20-24% at 20°C and solution density of 1.17 g/cm3 at 20°C, the equivalent water solubility in g/L using density and concentration is reported as ≥230 g/L.
- Conclusions:
- The substance was reported as fully miscible in water. Based on concentration of the aqueous solution of 20-24% at 20°C and solution density of 1.17 g/cm3 at 20°C, the equivalent water solubility in g/L using density and concentration is reported as ≥230 g/L.
- Endpoint:
- water solubility
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.6 (Water Solubility)
- Type of method:
- flask method
- Key result
- Water solubility:
- 774 g/L
- Temp.:
- 20 °C
- pH:
- 10.4
- Conclusions:
- The test item HEDP #13082 Nachsubstanz has a water solubility of 774 g/L at 20°C.
Referenceopen allclose all
Description of key information
Water solubility: HEDP-xK is commercially available as aqueous solutions at typically approximately 20% w/w to 43% w/w; these products are miscible in water with estimated water solubility of ≥230-530 g/L.
Key value for chemical safety assessment
- Water solubility:
- 230 g/L
- at the temperature of:
- 20 °C
Additional information
The substance HEDP-xK and its analogues are known to be highly hydrophilic and extremely water-soluble. HEDP-xK was reported as miscible or freely miscible in water with reported concentrations of 20 - 43% at 20°C but it is not clear from the source report whether this is expressed as %w/w, %v/v or %w/v. Using the solution densities reported for HEDP-xK, the equivalent water solubility in g/L using density and concentration is reported as ≥230 -530 g/L. In addition, as the value is known to be extremely high, the exact value is considered not significant for the chemical safety assessment for human health or environmental assessment and this limit value is therefore sufficient and is considered to be reliable.
This conclusion is supported by a measured water solubility of 774 g/L at 20°C and pH 10.4 for the tetrasodium salt of HEDP (HEDP-4Na). The available data are used as weight of evidence to indicate that the substance is highly soluble in water.
Phosphonate salts are highly water soluble and are supplied as aqueous solutions. Free acids are less soluble than the salts; however, aqueous solutions in excess of l % active material can be prepared. The aqueous solutions of sodium and potassium salts are miscible in water.
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