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Physical & Chemical properties

Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP status not known, guideline experimental study minor restrictions in design and/or reporting but otherwise adequate for assessment
Qualifier:
equivalent or similar to
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:
other: UN Transformation/Dissolution Protocol (T/DP) for Metals and Sparingly Soluble Metal Compounds.
GLP compliance:
not specified
Type of method:
other: Transformation/dissolution
Water solubility:
0.06 µg/L
Temp.:
20.8 °C
pH:
>= 5.93 - <= 6.05
Remarks on result:
other: pH 6 24-hr scoping study. Test Duration; 24 Hours, PdO Loading; 100 mg/L, σ = 0.02 µg/L, σ % = 31, Temperature Range; 20.1 - 21.1 ºC, DO; 8.1 - 8.9 mg/L
Water solubility:
1.06 µg/L
Temp.:
20.7 °C
pH:
>= 8.57 - <= 8.67
Remarks on result:
other: pH 8.5 24-hr scoping study. Test Duration; 24 Hours, PdO Loading; 100 mg/L, σ = 0.12 µg/L, σ % = 11. Temperature Range; 20.3 - 20.9 ºC, DO; 8.57 - 8.67 mg/L
Water solubility:
0 µg/L
Temp.:
21.1 °C
pH:
>= 8.58 - <= 8.73
Remarks on result:
other: Test Duration; 28 Days, PdO Loading; 1 mg/L, σ = 0 µg/L, Temperature Range; 20.6 - 21.5 ºC, DO; 7.5 - 11 mg/L
Water solubility:
0 µg/L
Temp.:
21.3 °C
pH:
>= 8.58 - <= 8.75
Remarks on result:
other: Test Duration; 7 Days, PdO Loading; 10 mg/L, σ = 0.0 µg/L, Temperature Range; 21.2 - 21.5 ºC, DO; 7.6 - 9.5 mg/L
Water solubility:
0 µg/L
Temp.:
21.1 °C
pH:
>= 8.58 - <= 8.72
Remarks on result:
other: Test Duration; 7 Days, PdO Loading; 100 mg/L, σ = 0.0 µg/L, Temperature Range; 20.9 - 21.4 ºC, DO; 7.5 - 9.7 mg/L
Details on results:
In the 24 hour scoping tests, palladium monoxide was as unreactive as palladium metal, with net changes being 0.06 and 1.06 µg/L for pH 6 and pH 8 respectively. Since both values were less than the ERV, the definitve test were perfromed at pH 8.5. The T/D data from the definitive test show that net concentration changes for PdO were 0.0 µg/L, therefore within the limits of analytical detection, PdO was unreactive.
Conclusions:
In the 24 hour scoping tests, palladium monoxide was as unreactive as palladium metal, with net changes being 0.06 and 1.06 µg/L for pH 6 and pH 8 respectively. Since both values were less than the ERV, the definitve test were perfromed at pH 8.5. The T/D data from the definitive test show that net concentration changes for PdO were 0.0 µg/L, therefore within the limits of analytical detection, PdO was unreactive.
Executive summary:

This is a guideline experimental study, of unknown GLP status, there are minor restrictions in design and/or reporting but otherwise adequate for assessment as a key study for this endpoint. In the 24 hour scoping tests, the palladium monoxide was as unreactive as palladium metal, with net changes being 0.06 and 1.06 µg/L for pH 6 and pH 8 respectively. Since both values were less than the ERV, the definitve test were perfromed at pH 8.5. The T/D data from the definitive test show that net concentration changes for PdO were 0.0 µg/L, therefore within the limits of analytical detection, PdO was unreactive.

Description of key information

In the definitive T/D test performed with palladium monoxide (anhydrous), at pH 8.5, the net concentration changes for palladium monoxide were 0 µg/L, therefore within the limits of analytical detection, palladium monoxide was unreactive.

Key value for chemical safety assessment

Additional information

Skeaff and Beaudoin (2011) is a non-GLP, guideline transformation / dissolution study conducted with palladium monoxide (anhydrous). The study is considered to be suitable for use as the key study for this endpoint. For palladium monoxide (anhydrous) in the 24-hour scoping tests, palladium monoxide showed net changes of 0.06 and 1.06 µg/L for pH 6 and pH 8.5 respectively. The definitive test was performed at pH 8.5. The T/D data from the definitive test show that net concentration changes for palladium monoxide were 0 µg/L, therefore within the limits of analytical detection, palladium monoxide (anhydrous) was unreactive.