lambda4-cerium(4+) zirconium(4+) tetraoxidandiide

Dissociation constant

Administrative data

Endpoint:

dissociation constant

Data waiving:

study technically not feasible

Justification for data waiving:

the study does not need to be conducted because the analytical method is not sensitive enough

Cross-reference

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

The water solubility of the reaction mass of cerium dioxide and zirconium dioxide was determined following the OECD 105 and EC A.6 test methods to be 0.16 µg/L at 20 °C (Weissenfeld, 2008). The study was performed on a representative nanoform of the reaction mass. The water solubility of any potential bulk form, should such form be placed on the market, can reasonably be expected to be even lower than that obtained for the representative nanoform.

Water solubility:

0.16 µg/L

at the temperature of:

20 °C

An experimental study performed on cerium dioxide, scored as Klimisch 1 (Weissenfeld, 2007), indicates a water solubility of < 0.123 µg/L, and literature information, scored as Klimisch 4 (three sources), also available for cerium dioxide, indicates consistently this compound to be not soluble in water.

An experimental study performed on zirconium dioxide, scored as Klimisch 1 (Paulus, 2010) indicates a water solubility of < 55 µg/L, and literature information, scored as Klimisch 2 (two sources), also available for zirconium dioxide, indicates consistently this compound to be (practically) insoluble in water.

Data on these constituents are used as supporting information in a read across analogue approach.