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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:
other: Non-GLP, guideline experimental study, fully adequate for assessmentt
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:
no
Type of method:
other: Transformation/dissolution
Type of test:
screening transformation/dissolution test - sparingly soluble metal compounds
Mean dissolved conc.:
107 µg/L
Element analysed:
Platinum
Loading of aqueous phase:
100 mg/L
Incubation duration:
24 h
Test conditions:
pH 6 (5.93 - 6.07), 20.8°C
Type of test:
screening transformation/dissolution test - sparingly soluble metal compounds
Mean dissolved conc.:
101 µg/L
Element analysed:
Platinum
Loading of aqueous phase:
100 mg/L
Incubation duration:
24 h
Test conditions:
pH 8.5 (8.3 - 8.8), 20.7°C
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
1.3 µg/L
Element analysed:
Platinum
Loading of aqueous phase:
1 mg/L
Incubation duration:
28 d
Test conditions:
pH 6 (5.78 - 6.32), 22.1°C
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
12.4 µg/L
Element analysed:
Platinum
Loading of aqueous phase:
10 mg/L
Incubation duration:
7 d
Test conditions:
pH 6 (5.76 - 6.13), 21.5°C
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
112.7 µg/L
Element analysed:
Platinum
Loading of aqueous phase:
100 mg/L
Incubation duration:
7 d
Test conditions:
pH 6 (5.75 - 6.09), 21.5°C
Details on results:
In the 24-hour scoping tests, platinum dioxide was as unreactive as platinum metal. For the 1, 10 and 100 mg PtO2/loadings, the net average concentrations increased relatively rapidly to the limiting values of 1.3 µg/L (σ % = 19), 12.4 µg/L (σ % = 3) and 112.7 µg/L (σ % = 3), respectively by seven days.

Summary of Transformation / Dissolution (T/D) data for Platinum 

Substance name

Formula

Weighed loadings mg/L

Target pH

Test duration

Net averages µg/L

Measured metal conc.

σ µg/L

σ %

Platinum

Pt

100

6

24-hour

107

2

2

 

 

100

8.5

24-hour

101

1

1

 

 

1

6

28-day

1.3

0.2

 19

 

 

10

6

7-day

12.4

0.4

3

 

 

100

6

7-day

112.7

3.5

3

σ standard deviation

Conclusions:
For platinum dioxide, in the 24-hour scoping tests at 100 mg/L measured concentrations were 107 µg/L at pH 6 and 101 µg/L at pH 8. In the definitive tests, the net average concentrations increased relatively rapidly to the limiting values of 1.3 µg/L at a loading rate of 1 mg/L after 28 days and 12.4 µg/L and 112.7 µg/L, at loadings rates of 10 and 100 mg/L respectively, after 7 days.
Executive summary:

This is a guideline transformation / dissolution study and is adequate for assessment as a key study for this endpoint. 24-hour scoping studies were conducted at pH 6 and pH 8.5 at a 100 mg/L loading rate. Definitive studies were then conducted at 10 and 100 mg/L (7 days) and 1 mg/L (28 days), all at pH 6.

For platinum dioxide, in the 24-hour scoping tests at 100 mg/L measured concentrations were 107 µg/L at pH 6 and 101 µg/L at pH 8. In the definitive tests, the net average concentrations increased relatively rapidly to the limiting values of 1.3 µg/L at a loading rate of 1 mg/L after 28 days and 12.4 µg/L and 112.7 µg/L, at loadings rates of 10 and 100 mg/L respectively, after 7 days.

Description of key information

For platinum dioxide, in the 24-hour scoping tests at 100 mg/L measured concentrations were 107 µg/L at pH 6 and 101 µg/L at pH 8. In the definitive tests, the net average concentrations increased relatively rapidly to the limiting values of 1.3 µg/L at a loading rate of 1 mg/L after 28 days and 12.4 µg/L and 112.7 µg/L, at loadings rates of 10 and 100 mg/L respectively, after 7 days.

Key value for chemical safety assessment

Water solubility:
112.7 µg/L
at the temperature of:
21.5 °C

Additional information

Skeaff and Beaudoin (2011) is a guideline transformation / dissolution study and is adequate for assessment as a key study for this endpoint.

24-hour scoping studies were conducted at pH 6 and pH 8.5 at a 100 mg/L loading rate. Definitive studies were then conducted at 10 and 100 mg/L (7 days) and 1 mg/L (28 days), all at pH 6.

For platinum dioxide, in the 24-hour scoping tests at 100 mg/L measured concentrations were 107 µg/L at pH 6 and 101 µg/L at pH 8. In the definitive tests, the net average concentrations increased relatively rapidly to the limiting values of 1.3 µg/L at a loading rate of 1 mg/L after 28 days and 12.4 µg/L and 112.7 µg/L, at loadings rates of 10 and 100 mg/L respectively, after 7 days.