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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Water solubility

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Reference
Endpoint:
transformation / dissolution of metals and inorganic metal compounds
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Series on Testing and Assessment No. 29 (23-Jul-2001): Guidance document on transformation/dissolution of metals and metal compounds in aqueous media
Qualifier:
according to guideline
Guideline:
other: UN Transformation/Dissolution Protocol (T/DP) for Metals and Sparingly Soluble Metal Compounds.
GLP compliance:
not specified
Type of method:
other: Transformation/dissolution
Type of test:
screening transformation/dissolution test - sparingly soluble metal compounds
Mean dissolved conc.:
3 µg/L
Element analysed:
Rhodium
Loading of aqueous phase:
100 mg/L
Incubation duration:
24 h
Test conditions:
pH 6 (5.87 - 6.09), 21.3°C
Type of test:
screening transformation/dissolution test - sparingly soluble metal compounds
Mean dissolved conc.:
2 µg/L
Element analysed:
Rhodium
Loading of aqueous phase:
100 mg/L
Incubation duration:
24 h
Test conditions:
pH 8 (8.51 - 8.66), 21.2°C
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
0 µg/L
Element analysed:
Rhodium
Loading of aqueous phase:
1 mg/L
Incubation duration:
28 d
Test conditions:
pH 6 (5.79 - 6.35), 22.3°C
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
0.04 µg/L
Element analysed:
Rhodium
Loading of aqueous phase:
10 mg/L
Incubation duration:
7 d
Test conditions:
pH 6 (5.76 - 6.37), 22.3°C
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
0.52 µg/L
Element analysed:
Rhodium
Loading of aqueous phase:
100 mg/L
Incubation duration:
7 d
Test conditions:
pH 6 (5.75 - 6.37), 22.3°C
Conclusions:
The net concentration changes for the 1 mg L-1 loadings at 28 days, and for the 10 and 100 mg L-1 loadings at 7 days for rhodium (III) oxide were just above the sub-µg L-1 detection limits. At a loading rate of 10 mg L-1 a concentration of 0.04 µg L-1 was detected and at a loading rate of 100 µg L-1 a concentration of 0.52 µg L-1 was detected, after 7 days. After 28 days, at a loading rate of 1 mg L-1, 0 µg L-1 was detected.
Executive summary:

Skeaff and Beaudoin (2011) is a guideline transformation dissolution study. As this is the standard approach for assessing poorly soluble metal substances it is considered to be suitable for use as the key study for this endpoint. 

The net concentration changes for the 1 mg L-1 loadings at 28 days, and for the 10 and 100 mg L-1 loadings at 7 days for rhodium (III) oxide were just above the sub-µg L-1 detection limits. At a loading rate of 10 mg L-1 a concentration of 0.04 µg L-1 was detected and at a loading rate of 100 µg L-1 µg L-1 a concentration of 0.52 µg L-1 was detected, after 7 days. After 28 days, at a loading rate of 1 mg L-1, 0 µg L-1 was detected.

Description of key information

The net concentration changes for the 1 mg L-1 loadings at 28 days, and for the 10 and 100 mg L-1 loadings at 7 days for rhodium (III) oxide were just above the sub-µg L-1 detection limits. At a loading rate of 10 mg L-1 a concentration of 0.04 µg L-1 was detected and at a loading rate of 100 µg L-1 a concentration of 0.52 µg L-1 was detected, after 7 days. After 28 days, at a loading rate of 1 mg L-1, 0 µg L-1 was detected.

Key value for chemical safety assessment

Water solubility:
0 µg/L
at the temperature of:
22 °C

Additional information

Skeaff and Beaudoin (2011) is a guideline transformation dissolution study. As this is the standard approach for assessing poorly soluble metal substances it is considered to be suitable for use as the key study for this endpoint. 

The net concentration changes for the 1 mg L-1 loadings at 28 days, and for the 10 and 100 mg L-1 loadings at 7 days for rhodium (III) oxide were just above the sub-µg L-1 detection limits. At a loading rate of 10 mg L-1 a concentration of 0.04 µg L-1 was detected and at a loading rate of 100 µg L-1 a concentration of 0.52 µg L-1 was detected, after 7 days. After 28 days, at a loading rate of 1 mg L-1, 0 µg L-1 was detected.