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Physical & Chemical properties

Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Justification for type of information:
In-house data assessment.
Solublity assessed at different pH and assessed in hardened water
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 105 (Water Solubility)
Principles of method if other than guideline:
Solubility at range of pH was investigated as has relevance for environmental and toxicological assessments.
Solublity in hardend water at low concentrations was also assessed for environmental relevance
GLP compliance:
no
Type of method:
flask method
Specific details on test material used for the study:
Batch No : D-02-4057
Key result
Water solubility:
> 500 g/L
Conc. based on:
test mat.
Temp.:
20 °C
pH:
ca. 1.9
Remarks on result:
completely miscible
Remarks:
pH unadjusted
Water solubility:
> 20 g/L
Conc. based on:
test mat. (total fraction)
Temp.:
20 °C
pH:
ca. 3
Remarks on result:
other: pH buffered for evaluation of solubility at different pH
Water solubility:
< 1 g/L
Conc. based on:
test mat. (total fraction)
Temp.:
20 °C
pH:
ca. 4
Remarks on result:
other: Buffered to pH 4
Water solubility:
< 100 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
100 mg/L
Temp.:
20 °C
pH:
ca. 3
Remarks on result:
other: Environmental hardness ca 100 mg/l caCO3
Water solubility:
ca. 1 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
1 mg/L
Temp.:
20 °C
pH:
4.3
Remarks on result:
other: Evironmental hardness ca 100 mg CaCO3
Details on results:
The data indicate reduced solubility in water when buffered to > pH 3
When repeated in hardened water, but no buffer, solublity was ca 1 mg/l based on test material, with a pH of 4.3 recorded.
A loading of 20 g/l in distilled water, buffered to pH 3 was soluble, but when 1 g/l was in hardened water, it was insoluble at pH 3
Conclusions:
The solubility is pH dependant with reduced solublity at pH 4 or more, suggesting formation of hydroxide / oxide
The substance supplied is typically in acidic solution
The data indicate reduced solubility in water when buffered to > pH 3
When repeated in hardened water, but no buffer, solublity was ca 1 mg/l based on test material, with a pH of 4.3 recorded.
A loading of 20 g/l in distilled water, buffered to pH 3 was soluble, but when 1 g/l was in hardened water, it was insoluble at pH 3

Description of key information

The data indicate reduced solubility in water when buffered to > pH 3

When repeated in hardened water, but no buffer, solubility was ca 1 mg/l based on test material, with a pH of 4.3 recorded.

A loading of 20 g/l in distilled water, buffered to pH 3 was soluble, but when 1 g/l was in hardened water, it was insoluble at pH 3

Solubility in the environment is therefore predicted to be very low.

Key value for chemical safety assessment

Water solubility:
500 g/L
at the temperature of:
20 °C

Additional information

Considered very soluble in water at its own pH (pH ca 2), with reported solublity > 500 g/l