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Diss Factsheets

Physical & Chemical properties

Water solubility

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Justification for type of information:
Performed to good standards under different pH conditions with confirmatory analysis.
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
Tested at different pH levels
Principles of method if other than guideline:
The solubility in water was based on determination of Chromium by ICP.
The method included initial visual assessment by direct observation in deionised water.
Tesrted unchanged in wate and also buffered to pH 1.5, pH 7 and pH 10
GLP compliance:
no
Type of method:
flask method
Specific details on test material used for the study:
Batch number of test material : Z-09-2715
Key result
Water solubility:
ca. 846 g/L
Conc. based on:
test mat.
Temp.:
20 °C
pH:
ca. 1.25
Water solubility:
ca. 850 g/L
Conc. based on:
test mat.
Temp.:
20 °C
pH:
ca. 1.5
Remarks on result:
other: pH buffered 1.5
Water solubility:
ca. 810 g/L
Conc. based on:
test mat. (total fraction)
Temp.:
20 °C
pH:
ca. 7
Remarks on result:
other: pH buffered 7
Water solubility:
ca. 810 g/L
Conc. based on:
test mat.
Temp.:
20 °C
pH:
ca. 10
Remarks on result:
other: pH buffered 10
Details on results:
The testing was performed in the presence of buffered to asses the solublity at pH 1.5, 7 and 10 to assess the effect of pH on solubilty that in turn woudl indicate differences under biological and environmental conditions.
There was no significant effect of pH withing this range.
Conclusions:
Solublity in water over a range of pH is approximately 850 g/l
The testing was performed in the presence of buffered to asses the solublity at pH 1.5, 7 and 10 to assess the effect of pH on solubilty that in turn woudl indicate differences under biological and environmental conditions.
There was no significant effect of pH withing this range.
Executive summary:

Although the substance is clearly very soluble in water at high concentrations, observations from ecotoxicity and biodegradation testing suggest that at low concentrations (10 - 100 mg/l) in hardened water, there is a precipitation. This is very likely chromium carbonate or calcium oxalate which are themselves sparingly soluble in water. (The reported solubility for calcium oxalate is ca 0.25 mg/l)

Therefore, under natural environmental conditions, it is likely that there is full dissociation and potential formation of other salts.

Description of key information

Solubility measured by IPC analysis of chromium to be ca 850 g/l

The testing was performed in the presence of buffered to asses the solubility at pH 1.5, 7 and 10 to assess the effect of pH on solubility that in turn would indicate differences under biological and environmental conditions.

There was no significant effect of pH within this range.

However, environmental toxicity work (biodegradation) suggests a much lower rate of solubility with precipitation noted at 30 mg/l in natural water. This is considered likely to be precipitation of oxalate salts (specifically calcium oxalate)

Key value for chemical safety assessment

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

Additional information