Registration Dossier
Registration Dossier
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EC number: 240-827-6 | CAS number: 16774-21-3
Toxicological Summary
Administrative data
Workers - Hazard via inhalation route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
DNEL related information
Workers - Hazard via dermal route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
Workers - Hazard for the eyes
Local effects
- Hazard assessment conclusion:
- medium hazard (no threshold derived)
Additional information - workers
Acute / short-term exposure (systemic and local effects)
- No acute data were available for the inhalation route of exposure. In accordance with REACH Annex VIII, this study does not need to be conducted as exposure via inhalation is a less likely route of exposure than the dermal route due to the special properties of the test item. Indeed the substance appears as a clump and formation of respirable suspended particulate matter is unlikely.
- No acute data were available for the dermal route as the substance is corrosive to the skin according to CLP criteria.
- Based on the available data and according to the criteria laid down in the CLP Regulation (EC) 1272/2008, cerium ammonium nitrate is classified as Eye damage category 1 (moderate hazard) and Skin corrosion category 1C (moderate hazard). No dose response curve can be derived based on the available data and so only an indication of the medium hazard category can be given. The hazard categories are indicated in the Guidance on Information Requirements and Chemical Safety Assessment - Part E Risk Characterisation.
Long-term exposure (systemic effects)
- Dermal: No long-term dermal toxicity studies are available for cerium ammonium nitrate. Furthermore, as the substance is classified as corrosive to the skin, serious local effects may be expected after repeated dermal exposure to the diluted test item and, for reasons of animal welfare, the test should be avoided. An oral combined repeated dose toxicity study with reproduction/developmental toxicity screening has been performed with the read-across substance cerium trinitrate (Braun, 2013). The No Observed Adverse Effect Level (NOAEL) for systemic effects (parental animals) was considered to be 330 mg/kg bw/day. However this value cannot be considered relevant for systemic toxicity after repeated oral exposure as this value was based on local effects rather than systemic effects: the morphological changes in the stomachs were reported to be local effects (irritation after repeated oral gavage) rather than systemic toxicity and the differences in the food consumption/body weight were considered secondary to the changes in the stomach. In addition, it is reported that two animals treated at 1000mg/kg bw/day died as a result of the stomach findings. Thus, no systemic effects related to the repeated oral exposure to the test item were really identified.
In the same study some changes in some reproduction/developmental parameters were also observed at the highest dose of 1000 mg/kg bw/day and the NOEL for reproduction/developmental toxicity was considered to be 330 mg/kg bw/day. However, clear conclusion could not be drawn on this study regarding the possible causes of these changes: a secondary effect resulting from the chemical stress observed in males and pregnant females due to high local irritation observed in the stomach after repeated oral gavage of the compound or a primary effect of the substance. Therefore, these effects could be considered as local effects rather than true systemic effects.
Overall, as only local effects were observed, there are no adequate data for route-to-route extrapolation.
Moreover, no adverse effects were observed in a prenatal developmental toxicity study according to OECD guideline 414 up to the highest dose tested (1000 mg/kg bw/day).
Thus, a worker-DNEL long-term for dermal route-systemic effects can not be derived.
- Inhalation:
No long-term inhalation toxicity studies are available for cerium ammonium nitrate but an oral combined repeated dose toxicity study with reproduction/developmental toxicity screening with the read-across substance cerium trinitrate exits (Braun, 2013).
As described here above for the DNEL long-term for dermal route-systemic effects), these data are no adequate for route-to-route extrapolation. Therefore a worker-DNEL long-term for inhalation route-systemic effects can not be derived based on this information. Furthermore, as the substance is classified as corrosive to the skin, serious local effects may be expected after repeated inhalation exposure to the diluted test item and, for reasons of animal welfare, the test should be avoided. In addition, the substance appears as a clump and is produced as a solution. Therefore formation of respirable suspended particulate matter is unlikely.
Long-term exposure (local effects)
- No reliable repeated dose toxicity study was available for this substance via the dermal and inhalation route of exposure. Therefore, a DNEL long-term exposure, local effects cannot be derived for the dermal and inhalation route.
Furthermore, and due to the special properties of the substance, cerium ammonium nitrate appears as a clump. Therefore formation of and exposure to respirable suspended particulate matter is unlikely.
Regarding DNEL long-term local effect, dermal exposure, although no DNEL can be derived, the substance is corrosive to the skin. Therefore as no reliable dose descriptor can be set for the irritation/corrosion endpoint, a qualitative assessment of the potency of the substance is performed according to ECHA's Guidance on Information Requirements and Chemical Safety Assessment Part E (2012). This assessment indicates that cerium ammonium nitrate is of moderate hazard. This hazard band will be used for the development of exposure scenarios with risk management measures and operational conditions for controlling exposures and thereby risks.
General Population - Hazard via inhalation route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
DNEL related information
General Population - Hazard via dermal route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
General Population - Hazard via oral route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
Acute/short term exposure
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
DNEL related information
General Population - Hazard for the eyes
Local effects
- Hazard assessment conclusion:
- hazard unknown but no further hazard information necessary as no exposure expected
Additional information - General Population
No consumer use is expected. Therefore, no DNEL is derived.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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