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Physical & Chemical properties

Water solubility

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Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Qualifier:
according to guideline
Guideline:
other: OECD guideline for testing of chemicals - draft proposal - February 2001. Transformation dissolution of metals and metal compounds in aqueous media.
Qualifier:
according to guideline
Guideline:
other: The standard procedure for the transformation/dissolution of metals and sparingly soluble metal compounds, version February 2004.
GLP compliance:
no
Remarks:
The tests were following as close as possible the GLP guidelines proposed by OECD
Type of method:
flask method
Water solubility:
0.3 µg/L
Temp.:
21.4 °C
pH:
5.97
Remarks on result:
other: Cobalt trihydroxide concentration at 0 hour sampling time at 1 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:
0.5 µg/L
Temp.:
22.9 °C
pH:
5.95
Remarks on result:
other: Cobalt trihydroxide concentration at 24 hour sampling time at 1 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:
0.6 µg/L
Temp.:
23.1 °C
pH:
5.92
Remarks on result:
other: Cobalt trihydroxide concentration at 48 hour sampling time at 1 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:
0.9 µg/L
Temp.:
22.9 °C
pH:
6
Remarks on result:
other: Cobalt trihydroxide concentration at 96 hour sampling time at 1 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:
1.3 µg/L
Temp.:
23.5 °C
pH:
5.88
Remarks on result:
other: Cobalt trihydroxide concentration at 168 hour sampling time at 1 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:
3.1 µg/L
Temp.:
23.1 °C
pH:
6.1
Remarks on result:
other: Cobalt trihydroxide concentration at 672 hour sampling time at 1 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:
1.8 µg/L
Temp.:
21.1 °C
pH:
6.02
Remarks on result:
other: Cobalt trihydroxide concentration at 0 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:
4.1 µg/L
Temp.:
22.3 °C
pH:
6.02
Remarks on result:
other: Cobalt trihydroxide concentration at 24 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:
4.7 µg/L
Temp.:
22.4 °C
pH:
5.99
Remarks on result:
other: Cobalt trihydroxide concentration at 48 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:
7.6 µg/L
Temp.:
23.3 °C
pH:
6
Remarks on result:
other: Cobalt trihydroxide 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:
8.9 µg/L
Temp.:
20.1 °C
pH:
5.87
Remarks on result:
other: Cobalt trihydroxide concentration at 0 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.
Water solubility:
20.5 µg/L
Temp.:
21.6 °C
pH:
5.81
Remarks on result:
other: Cobalt trihydroxide 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 cobalt trihydroxide is 3.1 µg/L at 1 mg/L loading for the 28-day endpoint.
The dissolution of cobalt trihydroxide is 7.6 µg/L at 10 mg/L loading for the 7-day endpoint.
The dissolution of cobalt trihydroxide is 20.5 µg/L 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 cobalt trihydroxide 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 cobalt trihydroxide at a mass loading of 1 mg/L and at a pH of 6.0. Under the conditions of this test, the dissolution of cobalt trihydroxide is 3.1 µg/L for the 28 -day endpoint (1 mg/L loading), 7.6 µg/L for the 7-day endpoint (10 mg/L loading) and 20.5 µg/L for the 7-day endpoint (100 mg/L loading).

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2009-02-25 to 2009-05-27
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study reliable without restrictions - The stability of the test material was missing.
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
, adopted 1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.6 (Water Solubility)
Version / remarks:
, 2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
signed 2008-11-12
Type of method:
column elution method
Water solubility:
1.29 mg/L
Temp.:
20 °C
pH:
ca. 5.6
Water solubility:
1.55 mg/L
Temp.:
37 °C
pH:
ca. 6.24
Details on results:
During this study the water solubility of cobaltic hydroxide at 20 °C and at 37 °C were determined was found to be 1.29 mg/L at 20 °C and 1.55 mg/L at 37 °C using the column elution method.
Conclusions:
Interpretation of results (migrated information): slightly soluble (0.1-100 mg/L)
During this study the water solubility of the test item was found to be 1.29 mg/L at 20 °C and 1.55 mg/L at 37 °C using the column elution method.

Description of key information

The water solubility of cobalt trihydroxide was 1.29 mg/L at 20 °C and 1.55 mg/L at 37 °C.

Key value for chemical safety assessment

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

Additional information

The water solubility of cobalt trihydroxide was determined according to OECD guideline 105 with the column elution method. During this study the water solubility of the test item was found to be 1.29 mg/L at 20 °C and 1.55 mg/L at 37 °C.