Palladium monoxide

Water solubility

Link to relevant study record(s)

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

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

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

Water solubility:

0.05 µg/L

at the temperature of:

21 °C

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.