Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

A risk characterisation for physicochemical hazards is required if hazards to human health resulting from the physicochemical properties of the substance (flammability, explosiveness, oxidising potential) have been identified. Cerium ammonium nitrate is concluded to have oxidising properties, meaning that it can cause or contribute to the combustion of other materials by yielding oxygen. The hazard communication for category 2 oxidising solids by means of the precautionary statements (prevention: P210, P220, P221, P280; response: P370, P378) are considered to provide adequate information for safe handling of the substance during storage, transport and use.

Additional information

A risk characterisation for physicochemical hazards is required if hazards to human health resulting from the physicochemical properties of the substance (flammability, explosiveness, oxidising potential) have been identified. Cerium ammonium nitrate is concluded to have oxidising properties, meaning that it can cause or contribute to the combustion of other materials by yielding oxygen.

 

The assessment shall entail an evaluation of the likelihood (risk) that an adverse effect will be caused under the reasonably foreseeable conditions of use in the workplace or by consumers. As the life cycle assessment of Cerium ammonium nitrate shows that consumers will not come into contact with the substance in a form that the identified hazard is still existing, a risk characterisation for the consumer needs not to be performed. Furthermore, the workplace accident scenarios to be especially considered linked to REACH are minor accidents, as major accidents caused by chemicals and the requirements to manage these risks are regulated under the Seveso II Directive (Council Directive 96/82/EC). Detailed methodologies to evaluate the risks associated with the handling of such substances under normal operational conditions or maintenance activities are available at the relevant industrial sites and applicable to assess likelihood and potential severity of an accident (e.g. HAZOP analysis). Hence it is assumed that major accident risks are adequately covered at the workplace level. Cerium ammonium nitrate and comparable substances classified on their physicochemical properties have been handled by the registrant for years. The hazard of oxidising substances is characterised by the fact that, in contact with other materials, they are able to cause or contribute to the combustion of those materials. Due to the possible effect of reacting with other materials, warehousing and transportation of substances with oxidizing properties together with e.g. combustible substances are regulated under Council Directive 96/82/EC and international agreement on transportation of dangerous goods (ADR).

 

Considering the above, the hazard communication for category 2 oxidising solids by means of the precautionary statements (prevention: P210, P220, P221, P280; response: P370, P378) are considered to provide adequate information for safe handling of the substance during storage, transport and use and are considered as measures taken when handling the pure substance (keep away from heat, clothing and other combustible materials, avoid mixing with comubstibles and wear protective gloves).

 

The above rationale justifies that the severity and likelihood of adverse events resulting from the identified physical hazard of cerium ammonium nitrate is negligible and that the use of the substance can be considered of no immediate concern.