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Water solubility

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Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
GLP compliance:
no
Type of method:
flask method
Water solubility:
46.8 µg/L
Temp.:
21.5 °C
pH:
6
Remarks on result:
other: Co3O4 concentration at 24 hour sampling time at 100 mg/L loading. Average value from the tests of the four laboratories is given on a log10-scale.
Water solubility:
17.5 µg/L
Temp.:
21.5 °C
pH:
ca. 6
Remarks on result:
other: Co3O4 concentration at 672 hour sampling time at 1 mg/L loading. Average value from the tests of the four laboratories is given on a log10-scale.
Water solubility:
3.32 µg/L
Temp.:
21.5 °C
pH:
ca. 6
Remarks on result:
other: Co3O4 concentration at 168 hour sampling time at 1 mg/L loading. Average value from the tests of the four laboratories is given on a log10-scale.
Water solubility:
33.5 µg/L
Temp.:
21.5 °C
pH:
ca. 6
Remarks on result:
other: Co3O4 concentration at 168 hour sampling time at 10 mg/L loading. Sample analysis was conducted in triplicate per test vessel (3 test vessels per loading). Average value from the tests is given.
Water solubility:
169 µg/L
Temp.:
21.5
pH:
ca. 6
Remarks on result:
other: Co3O4 concentration at 168 hour sampling time at 100 mg/L loading. Sample analysis was conducted in triplicate per test vessel (3 test vessels per loading). Average value from the tests is given.
Conclusions:
Under the conditions of the transformation/dissolution test, the dissolution of Co3O4 is 1.03 on a log10-scale at 1 mg/L loading for the 28-day endpoint.
The dissolution of Co3O4 is 1.41 on a log10-scale at 10 mg/L loading for the 7-day endpoint.
The dissolution of Co3O4 is 2.12 on a log10-scale at 100 mg/L loading for the 7-day endpoint.
Executive summary:

A seven day transformation/dissolution test according to the OECD guideline 29 and the GHS (Annex 10) protocol was run on Co3O4 at a mass loading of 10 and 100 mg/L, at a pH of 6.0 Also a 28 day transformation/dissolution was run on Co3O4 at a mass loading of 1 mg/L and at a pH of 6.0. Under the conditions of this test, the dissolution of Co3O4 is 1.03 on a log10 -scale for the 28 -day endpoint (1 mg/L loading), 1.41 on a log10 -scale for the 7 -day endpoint (10 mg/L loading) and 2.12 on a log10 -scale for the 7 -day endpoint (100 mg/L loading).

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2005-08-18 to 2005-09-21
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The stability of the test material was not available.
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
, 1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.6 (Water Solubility)
Version / remarks:
, 1992
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
signed 2003-03
Type of method:
column elution method
Water solubility:
>= 1.56 - <= 1.68 mg/L
Temp.:
20 °C
pH:
>= 6.96 - <= 7.48
Water solubility:
>= 5.1 - <= 5.56 mg/L
Temp.:
37 °C
pH:
>= 6.62 - <= 7.31
Details on results:
Total elution times were about 93 hours at 20 °C and 115.5 hours at 37 °C. The measured results differ by less than 30 %. Therefore, the study is considered to be valid.
The water solubility was not corrected for the purity of the test item.
Conclusions:
Interpretation of results: slightly soluble (0.1-100 mg/L)
The water solubility of Tricobalt Tetraoxide was found to be at 20°C 1.62 mg/L and at 37°C 5.33 mg/L using the column elution method.

Description of key information

Tricobalt tetraoxide has a water solubility 1.62 mg/L at 20 °C and 5.33 mg/L at 37 °C .

Key value for chemical safety assessment

Water solubility:
1.62 mg/L
at the temperature of:
20 °C

Additional information