Reaction product of zirconium (IV) dioxide and zirconium (IV) dicarbonate with nitric acid

Adsorption / desorption

Administrative data

Endpoint:

adsorption / desorption: screening

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the physicochemical properties of the substance indicate that it can be expected to have a low potential for adsorption

other:

Justification for type of information:

The inorganic susbtance is soluble water and in the soluble form will be dissociated. The behaviour in soil will therefore be depending on the counter ions present in the soil and the association of Zr4+ ions to the soild surface. This cannot be predicted from laboratory screening studies. Zirconium in soil is mostly present as insoluble carbonate and oxide; therefore, it will not be mobile in soil. The solubility in soil and its mobility may increase due to the formation of soluble complexes with organic matter in soil, with a lower soil pH potentially facilitating complexation

Cross-reference

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Justification for type of information:

In-house data assessment.

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Principles of method if other than guideline:

Solubility at range of pH was investigated as has relevance for environmental and toxicological assessments.

GLP compliance:

no

Type of method:

other: Observations

Specific details on test material used for the study:

Batch number of test material: C-04-3584

Key result

Water solubility:

ca. 1 000 g/L

Conc. based on:

test mat.

Temp.:

20 °C

pH:

ca. 1.2

Remarks on result:

completely miscible

Remarks:

pH unadjusted

Water solubility:

> 50 g/L

Conc. based on:

test mat. (total fraction)

Temp.:

20 °C

pH:

ca. 1.5

Remarks on result:

other: pH buffered for evaluation of solubility at different pH

Conclusions:

The solubility is pH dependant with reduced solublity at pH 5 or more, suggesting formation of hydroxide / oxide
The substance supplied is typically in acidic solution