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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
Study period:
10 March 2014 - 23 September 2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 105 (Water Solubility)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.6 (Water Solubility)
GLP compliance:
yes (incl. certificate)
Type of method:
flask method
Key result
Water solubility:
269 µg/L
Conc. based on:
test mat. (dissolved fraction)
Remarks:
result calculated based on measured Yb concentrations
Incubation duration:
>= 24 - <= 192 h
Temp.:
20 °C
pH:
8
Remarks on result:
other: mean obtained after 5 different stirring times; Relative Standard Deviation = 56%
Key result
Water solubility:
236 µg/L
Conc. based on:
element (dissolved fraction)
Remarks:
Yb
Incubation duration:
>= 24 - <= 192 h
Temp.:
20 °C
pH:
8
Remarks on result:
other: mean obtained after 5 different stirring times; Relative Standard Deviation = 56%

Results of the preliminary tests were as follows:

 Amount of test item (mg)  Total volume (ml)  Appearance of mixture
 10.5  10  undissolved particles*
 11.5  100  undissolved particles*
 10.6  200  undissolved particles*
 10.6  400  apparently clear solution, test item completely dissolved*

*The mixture was shaken

Results of the main test were as follows:

Mean intensity of the spectra line and calculated concentrations of ytterbium and test item:     

Sample stirring time Mean intensity (c/s) Ytterbium content (µg Yb/L) Content test item (µg TI/L)
 24 h

31405

30323

 281  320
 48 h

26133

28514

26085

26030

26034

 242  276
 72 h

16218

16371

 149  169
 144 h

8811

8822

 81  92
 192 h

46981

47208

 427  487

Number of samples: 5

Mean content of the test item: 269 µg test item/L

Standard deviation: 151 µg test item/L

Relative standard deviation (RSD): 56%

Conclusions:
The water solubility of ytterbium(III) oxide determined according to the "flask method" was 269 µg/L at pH 8 and 20°C. Expressed as dissolved Yb concentration this is a water solubility of 236 µg Yb/L.

Description of key information

The water solubility of the test substance was determined according to OECD guideline 105 and the EC A.6 method (flask method) in a GLP study (Petrovic, 2014; Klimisch 1) and was found to be 236 µg/L at pH 8 and 20°C, when expressed as ytterbium content in water, and 269 µg/L, when recalculated to ytterbium oxide.

Key value for chemical safety assessment

Water solubility:
269 µg/L
at the temperature of:
20 °C

Additional information