Registration Dossier
Registration Dossier
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EC number: 256-852-0 | CAS number: 50925-66-1
Water solubility
Administrative data
Link to relevant study record(s)
- Endpoint:
- water solubility
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Justification for type of information:
- In-house laboraotry work including impact of pH
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 105 (Water Solubility)
- Principles of method if other than guideline:
- Solubility was measured at the pH of thematerial and then measured over a range to represent environmental conditions.
- GLP compliance:
- no
- Type of method:
- other: Observations
- Specific details on test material used for the study:
- Batch number of test material: B-03-3167
Technical grade material is in hydrated form - Key result
- Water solubility:
- ca. 700 g/L
- Conc. based on:
- test mat.
- Incubation duration:
- ca. 72 h
- Temp.:
- 20 °C
- pH:
- ca. 1.5
- Key result
- Water solubility:
- ca. 0.1 g/L
- Conc. based on:
- test mat.
- Temp.:
- 20 °C
- pH:
- ca. 5
- Key result
- Water solubility:
- < 0.1 g/L
- Conc. based on:
- test mat.
- Temp.:
- 20 °C
- pH:
- ca. 7
- Conclusions:
- The solubility is very pH dependant with precipitation at neutral or alkaline pH resulting in very low water solubility expected under environmental conditions.
The substance supplied is acidic.
A subsequent check was made for solubility at 100 mg/l and was found to be sparingly soluble at pH 7
It is known that under environmental condtions where ion exchange with sedments is possible, chromium salts quickly precipitate out as Cr(OH3).
Reference
Solubility between pH 1 to > pH 10
0.1 g/1000 ml |
CrCl3-x(OH)x mg/l |
pH < 1 |
Soluble |
pH 1.5 |
Soluble |
pH 4.0 |
Soluble |
pH 5.0 |
Insoluble |
pH 9.0 |
Insoluble |
pH > 10 |
Insoluble |
Conclusions:
This demonstrates that the solubility in water is high but it becomes insoluble at pH 5.
Description of key information
Key value for chemical safety assessment
- Water solubility:
- 700 g/L
- at the temperature of:
- 20 °C
Additional information
The pH is 1.5
The substance is soluble until pH 4, then it becomes sparingly soluble and at a pH >7 is insoluble.
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