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Physical & Chemical properties

Oxidising properties

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Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
from 10 October 2008 to 21 November 2008
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
EU Method A.17 (Oxidising Properties (Solids))
Deviations:
no
GLP compliance:
yes (incl. certificate)
Contact with:
powdered cellulose
Sample tested:
other: 2:1 mixture barium nitrate + cellulose
Parameter:
other: burning time during preliminary test
Result:
116 s
Sample tested:
other: 2:1 mixture test item + cellulose
Parameter:
other: burning time during preliminary test
Result:
9.5 s
Remarks on result:
other: The combustion of the substance mixture (test item / cellulose - ratio 2/1) burned immediately in contact with the wire and the combustion developed through the entire mixture in 9.5 seconds and produced an active white flame.

The burning rate of the test mixture was higher compared to the burning rate of the reference mixture. The substance is thus concluded to have oxidising properties.

As the results of the preliminary test were conclusive, a main study was not performed.

Interpretation of results:
other: oxidising, but no distinguishment can be made between the three CLP categories
Conclusions:
According to this test cerium ammonium nitrate has oxidising properties. Based on the results, no distinction can be made between the 3 CLP categories.
Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Result published in trustworthy source (UN Recommendations on the transport of dangerous goods; Manual of tests and criteria, third edition).
Qualifier:
according to
Guideline:
other: United Nations scheme for classification of oxidising substances of Division 5.1
Deviations:
no
GLP compliance:
no
Contact with:
powdered cellulose
Key result
Sample tested:
reference: 3:2 mixture potassium bromate + cellulose
Parameter:
mean burning time
Result:
4 s
Key result
Sample tested:
reference: 2:3 mixture potassium bromate + cellulose
Parameter:
mean burning time
Result:
54 s
Sample tested:
reference: 3:7 mixture potassium bromate + cellulose
Parameter:
mean burning time
Result:
100 s
Key result
Sample tested:
4:1 sample-to-cellulose ratio
Parameter:
mean burning time
Result:
10 s
Key result
Sample tested:
1:1 sample-to-cellulose ratio
Parameter:
mean burning time
Result:
36 s

As the mean burning time of the sample-to-cellulose ratio 4:1 or 1:1 was less than the mean burning time of a 2:3 mixture (by mass) of potassium bromate and cellulose, cerium ammonium nitrate is considered as oxidising.

As the mean burning time of the sample-to-cellulose ratio 4:1 or 1:1 was above the mean burning time of a 3:2 mixture (by mass) of potassium bromate and cellulose, cerium ammonium nitrate is considered a packing group II oxidising substance.

Interpretation of results:
Category 2 (oxidising solids) based on GHS criteria
Conclusions:
According to this test cerium ammonium nitrate has oxidising properties (packing group II).

Description of key information

Cerium ammonium nitrate was concluded to be an oxidising solid (packing group II) following data reported in the UN Recommendations on the transport of dangerous goods, Manual of tests and criteria.

Key value for chemical safety assessment

Oxidising properties:
oxidising

Additional information

Cerium ammonium nitrate is mentioned in section 34.4.1 of the UN Manual of Tests and Criteria to be an oxidising solid, Packing Group II.

In a supporting study performed under GLP and according to test method EC A.17 (Vibert, 2008), the substance was concluded to have oxidising properties. As the EC A.17 test does not distinguish between a category 1, 2 or 3 oxidising solid as required for CLP, the UN data are taken as the key information.

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Justification for classification or non-classification

Based on data on cerium ammonium nitrate as reported in the UN Manual of Tests and Criteria, this substance is concluded to be a category 2 oxidising solid according to CLP Regulation and H272 is assigned. Experimental data in accordance with the EC A.17 test confirm that the substance has oxidising properties but do not distinguish between a category 1, 2 or 3 oxidising solid.