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Physical & Chemical properties

Water solubility

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Administrative data

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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:
OECD Guideline 105 (Water Solubility)
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:
228.5 µg/L
Temp.:
21.4 °C
pH:
5.97
Remarks on result:
other: Co(OH)2 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:
501.9 µg/L
Temp.:
22.5 °C
pH:
6.01
Remarks on result:
other: Co(OH)2 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:
453.5 µg/L
Temp.:
22.7 °C
pH:
5.99
Remarks on result:
other: Co(OH)2 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:
488.4 µg/L
Temp.:
22.6 °C
pH:
6.09
Remarks on result:
other: Co(OH)2 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:
463.3 µg/L
Temp.:
23.1 °C
pH:
5.94
Remarks on result:
other: Co(OH)2 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:
412.9 µg/L
Temp.:
23.4 °C
pH:
6.27
Remarks on result:
other: Co(OH)2 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:
1 949.9 µg/L
Temp.:
21.1 °C
pH:
6.02
Remarks on result:
other: Co(OH)2 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:
6 637.5 µg/L
Temp.:
22.1 °C
pH:
6.53
Remarks on result:
other: Co(OH)2 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:
6 345.4 µg/L
Temp.:
22 °C
pH:
6.48
Remarks on result:
other: Co(OH)2 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:
4 890 µg/L
Temp.:
21.8 °C
pH:
6.49
Remarks on result:
other: Co(OH)2 concentration at 96 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.
Conclusions:
Under the conditions of the transformation/dissolution test, the dissolution of Co(OH)2 is 412.9 µg/L at 1 mg/L loading for the 28-day endpoint.
The dissolution of Co(OH)2 is 5019.9 µg/L at 10 mg/L loading for the 7-day endpoint.
The dissolution of Co(OH)2 is 50065.9 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 Co(OH)2 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 Co(OH)2 at a mass loading of 1 mg/L and at a pH of 6.0. Under the conditions of this test, the dissolution of Co(OH)2 is 412.9 µg/L for the 28 -day endpoint (1 mg/L loading), 5019.9 µg/L for the 7 -day endpoint (10 mg/L loading) and 50065.9 µg/L for the 7 -day endpoint (100 mg/L loading).
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
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:
5 019.9 µg/L
Temp.:
22.7 °C
pH:
6.44
Remarks on result:
other: Co(OH)2 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:
3 640 µg/L
Temp.:
20.1 °C
pH:
5.87
Remarks on result:
other: Co(OH)2 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:
41 009.5 µg/L
Temp.:
22.6 °C
pH:
7.31
Remarks on result:
other: Co(OH)2 concentration at 24 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:
46 743.3 µg/L
Temp.:
22.2 °C
pH:
7.26
Remarks on result:
other: Co(OH)2 concentration at 48 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:
55 335 µg/L
Temp.:
22 °C
pH:
7.17
Remarks on result:
other: Co(OH)2 concentration at 96 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:
50 065.9 µg/L
Temp.:
21.8 °C
pH:
7.43
Remarks on result:
other: Co(OH)2 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 Co(OH)2 is 412.9 µg/L at 1 mg/L loading for the 28-day endpoint.
The dissolution of Co(OH)2 is 5019.9 µg/L at 10 mg/L loading for the 7-day endpoint.
The dissolution of Co(OH)2 is 50065.9 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 Co(OH)2 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 Co(OH)2 at a mass loading of 1 mg/L and at a pH of 6.0. Under the conditions of this test, the dissolution of Co(OH)2 is 412.9 µg/L for the 28 -day endpoint (1 mg/L loading), 5019.9 µg/L for the 7 -day endpoint (10 mg/L loading) and 50065.9 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:
2006-09-19 to 2007-01-30
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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 2005-11
Type of method:
column elution method
Water solubility:
2 300 µg/L
Conc. based on:
test mat. (dissolved fraction)
Loading of aqueous phase:
1 other: % (w/w) in solid phase
Incubation duration:
92.5 h
Temp.:
20 °C
pH:
7
Remarks on result:
other: St.dev.: 460 µg/L
Water solubility:
8 550 µg/L
Conc. based on:
test mat. (dissolved fraction)
Loading of aqueous phase:
1 other: % (w/w) in solid phase
Incubation duration:
96 h
Temp.:
37 °C
pH:
7.2
Remarks on result:
other: St.dev.: 1630 µg/L
Details on results:
Total elution times were about 92.5 hours at 20°C and 96 hours at 37°C. The measured results differ by less than 30%. Therefore, the study is considered to be valid.
Conclusions:
The water solubility of Cobalt dihydroxide was found to be at 20 °C 2300 µg/L (+/-460 µg/L) and at 37 °C 8.55 mg/L (+/-1630 µg/L) using the column elution method.

Description of key information

The water solubility of cobalt dihydroxide is 2300 µg/L (+/-460 µg/L) at 20°C and 8550 µg/L (+/-1630 µg/L) at 37°C.

Key value for chemical safety assessment

Water solubility:
2 300 µg/L
at the temperature of:
20 °C

Additional information