Registration Dossier

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Summary of degradation

Ammonium zirconium carbonate (AZC)is inorganic and hence the ready biodegradation and hydrolysis tests are not relevant. This is because there is no carbon to be evolved and no chemical bonds to be broken, respectively. It is also not technically feasible to conduct a hydrolysis study AZC only ever exists as a solution in water across a narrow pH range. If removed from this range then AZC does not exist in the form to be registered.

In environmentally-relevant conditions there is expected to be decomposition of the substance to form zirconium hydroxide, together with accompanying release of carbonate and ammonium ions.

Volatilisation

Data on volatilisation are not available for the substance. It is not feasible to calculate the vapour pressure of the substance.

Distribution modelling

No distribution modelling data exist. Modelling is not relevant to this inorganic substance.

Summary of environmental distribution

No data on adsorption/desorption is available for the substance in the absence of test or (Q)SAR methodology appropriate to the substance.

Summary and discussion of bioaccumulation

No experimental data on bioaccumulation exist. The data are not required as the hazard and risk assessment performed during the chemical safety assessment concludes that the substance is not classified and is of no immediate concern to the environment.The available data are adequate for classification and labelling purposes. Since AZC is an inorganic substance a PBT assessment is not required.

Secondary poisoning

Bioaccumulation of AZC is not expected to occur. Hence no secondary poisoning risk exists.

Assessment of PBT/vPvB Properties - Comparison with the Criteria of Annex XIII

According to the Guidance on information requirements and chemical safety assessment, Chapter R.11: PBT assessment, “the PBT and vPVB criteria of Annex XIII to the regulation do not apply to inorganic substances”. Therefore the substance AZC is not considered to require any further assessment of PBT properties.