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EC number: 237-529-3
CAS number: 13826-66-9
Results : without pH adjustment (at 20°C):
Water solubility at 20 °C: Concentration in g Zr / L
Overall standard deviation
Water solubility at 20 °C: Concentration in g test item / L
Results: adjustment to pH 4 (at 20°C):
Water solubility at 20 °C: Concentration in mg Zr / L
Water solubility at 20 °C: Concentration in mg test item / L
Results: adjustment to pH 7 (at 20°C):
Water solubility at 20 °C: Concentration in mg test item/ L
Results: adjustment to pH 9 (at 20°C):
The water solubility of zirconium dinitrate oxide (anhydrous) was
determined to be 115 g/L at 20°C (corresponding to 169 g test
substance/L that is hydrated dinitrate oxide) and pH 0.48 (Bauer, 2015).
Dissolution of the substance is accompanied with a strong pH decrease.
When adjusting pH to environmentally relevant values (i.e. pH = 4, 7 or
9), no measurable dissolved Zr levels could be observed.
A GLP study performed according to OECD guideline 105 and EC Method A.6
(Bauer, 2015) determined the water solubility of the test item to be 169
g/L at 20°C (value calculated based on measurement of 45.5 mg Zr/L by
ICP-AES). The nominal loading rate of the test item was 200 g/L.
Dissolution of the test substance was clearly accompanied with a pH
decrease, as the pH of the test solutions was 0.48. Through
recalculation, a water solubility of 115 g/L is obtained for anhydrous
zirconium dinitrate oxide.
When adjusting the pH to 4, no dissolved Zr was observed at measurable
levels in any of the samples during the main test. No measurements were
performed at pH 7 and 9 in the main test, however, during the
preliminary tests at a loading rate of 100 g/L (ICP-AES) and 10 g/L
(ICP-MS), no measurable dissolved Zr could be observed at these pH
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