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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
Study period:
2017-11-13 to 2018-01-15
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according 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
Deviations:
no
GLP compliance:
no
Type of method:
flask method
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Element analysed:
Zr
Loading of aqueous phase:
1 mg/L
Incubation duration:
7 d
Test conditions:
pH 8, ca. 22 °C
Remarks on result:
not determinable because of methodological limitations
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Element analysed:
Zr
Loading of aqueous phase:
1 mg/L
Incubation duration:
28 d
Test conditions:
pH 8, ca. 22 °C
Remarks on result:
not determinable because of methodological limitations
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Element analysed:
Zr
Loading of aqueous phase:
10 mg/L
Incubation duration:
7 d
Test conditions:
pH 8, ca. 22 °C
Remarks on result:
not determinable because of methodological limitations
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Element analysed:
Zr
Loading of aqueous phase:
100 mg/L
Incubation duration:
7 d
Test conditions:
pH 8, ca. 22 °C
Remarks on result:
not determinable because of methodological limitations
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Element analysed:
Yb
Loading of aqueous phase:
1 mg/L
Incubation duration:
7 d
Test conditions:
pH 8, ca. 22 °C
Remarks on result:
not determinable because of methodological limitations
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Element analysed:
Yb
Loading of aqueous phase:
1 mg/L
Incubation duration:
28 d
Test conditions:
pH 8, ca. 22 °C
Remarks on result:
not determinable because of methodological limitations
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
0.011 µg/L
Element analysed:
Yb
Loading of aqueous phase:
10 mg/L
Incubation duration:
7 d
Test conditions:
pH 8, ca. 22 °C
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
0.069 µg/L
Element analysed:
Yb
Loading of aqueous phase:
100 mg/L
Incubation duration:
7 d
Test conditions:
pH 8, ca. 22 °C
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Element analysed:
Hf
Loading of aqueous phase:
1 mg/L
Incubation duration:
7 d
Test conditions:
pH 8, ca. 22 °C
Remarks on result:
not determinable because of methodological limitations
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Element analysed:
Hf
Loading of aqueous phase:
1 mg/L
Incubation duration:
28 d
Test conditions:
pH 8, ca. 22 °C
Remarks on result:
not determinable because of methodological limitations
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Element analysed:
Hf
Loading of aqueous phase:
10 mg/L
Incubation duration:
7 d
Test conditions:
pH 8, ca. 22 °C
Remarks on result:
not determinable because of methodological limitations
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Element analysed:
Hf
Loading of aqueous phase:
100 mg/L
Incubation duration:
7 d
Test conditions:
pH 8, ca. 22 °C
Remarks on result:
not determinable because of methodological limitations
Conclusions:
Transformation / dissolution (T/D) of Ytterbium stabilized Zirconium and Hafnium Oxide, in powder form, was performed at the pH of maximum dissolution, selected from the results of a 24 hour screening test at pH 6, 7 and 8. Only ytterbium release was detected above the method detection limit (MDL) at the three pH values tested, and specifically, pH 8 presents the maximum dissolution. An average metal release of 0.069 µg/L was measured after 7 days with T/D protocol at 100 mg/L mass loading. Also, an average value of 0.011 µg/L was measured after the 7 day test at 10 mg/L mass loading.
Executive summary:

Transformation / dissolution (T/D) of Ytterbium stabilized Zirconium and Hafnium Oxide, in powder form, was performed at the pH of maximum dissolution, selected from the results of a 24 hour screening test at pH 6, 7 and 8. Only ytterbium release was detected above the method detection limit (MDL) at the three pH values tested, and specifically, pH 8 presents the maximum dissolution.  An average metal release of 0.069 µg/L was measured after 7 days with T/D protocol at 100 mg/L mass loading. Also, an average value of 0.011 µg/L was measured after the 7 days test at 10 mg/L mass loading.

Description of key information

Transformation / dissolution (T/D) of Ytterbium stabilized Zirconium and Hafnium Oxide, in powder form, was performed at the pH of maximum dissolution, selected from the results of a 24 hour screening test at pH 6, 7 and 8. Only ytterbium release was detected above the method detection limit (MDL) at the three pH values tested, and specifically, pH 8 presents the maximum dissolution.  An average metal release of 0.069 µg/L was measured after 7 days with T/D protocol at 100 mg/L mass loading. Also, an average value of 0.011 µg/L was measured after the 7 day test at 10 mg/L mass loading.

Key value for chemical safety assessment

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

Additional information