Diammonium sodium hexakis(nitrito-N)rhodate

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

equivalent or similar to guideline

Guideline:

UN Manual of Tests and Criteria: Test O.1 (Test for oxidizing solids)

Deviations:

yes

Remarks:

Electrical resistance of ignition wire used was 3.9Ω/m.

GLP compliance:

yes (incl. QA statement)

Contact with:

powdered cellulose

Sample tested:

1:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

225 s

Remarks on result:

other:

Remarks:

The burning time for test 1 was not recorded because the extinguishing of the flame was thought to be the end of the reaction, and thus the timing device was stopped at this point. It was not considered necessary to repeat test 1 as it was unlikely to affect the classification.

Sample tested:

4:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

90 s

Remarks on result:

other:

Remarks:

The ignition broke during 4 of the 5 tests. The burning time for test 3 (where wire did not break) is reasonable typical of the burning times for the tests where the wire broke. This showed that the breaking of the wire did not have any significant effect on the burning times. The time for test 5 was not recorded prior to the wire breaking and the burning time was not recorded due to a timing device malfunctioning, however it was concluded that repeating the test was not necessary as it was unlikely to affect the classification.

Results of 3:7 (by mass) reference mixture of potassium bromate and cellulose
Test Number	Burning Time (s)	Observations
1	103	Cone burned with a blue/yellow flame, producing sparks and leaving black charred remains
2	105	Cone burned with a blue/yellow flame, producing sparks and leaving black charred remains
3	117	Cone burned with a blue/yellow flame, producing sparks and leaving black charred remains
4	120	Cone burned with a blue/yellow flame, producing sparks and leaving black charred remains
5	108	Cone burned with a blue/yellow flame, producing sparks and leaving black charred remains
mean burning time(s):	111
Results of 2:3 (by mass) reference mixture of potassium bromate and cellulose mixture
Test Number	Burning Time (s)	Observations
1	67	Cone burned with a bright yellow flame, producing white sparks and grey smoke leaving black charred remains
2	54	Cone burned with a bright yellow flame, producing white sparks and grey smoke leaving black charred remains
3	56	Cone burned with a bright yellow flame, producing white sparks and grey smoke leaving black charred remains
4	55	Cone burned with a bright yellow flame, producing white sparks and grey smoke leaving black charred remains
5	66	Cone burned with a bright yellow flame, producing white sparks and grey smoke leaving black charred remains
Mean burning time (s)	59.6
Results of 1:1 (by mass) test item and cellulose mixture
1	-	Cone burned with a yellow flame producing grey smoke. Flame self-extinguished after 114 seconds, but continued to smoulder eventually leaving black charred remains
2	256	Cone burned with a yellow flame producing grey smoke. Flame self-extinguished after 126 seconds, but continued to smoulder eventually leaving black charred remains after 259 seconds
3	266	Cone burned with a yellow flame producing grey smoke. Flame self-extinguished after 129 seconds, but continued to smoulder eventually leaving black charred remains after 266 seconds
4	248	Cone burned with a yellow flame producing grey smoke. Flame self-extinguished after 128 seconds, but continued to smoulder eventually leaving black charred remains after 248 seconds
5	126	Cone burned with a yellow flame producing grey smoke. Flame self-extinguished after 126 seconds, by which time the cone had charred through completely
Mean burning time (excluding test number 1)	225 seconds

Results of 4:1 (by mass) test item and cellulose mixture
Test Number	Burning time (s)	Observations
1	83	Cone burned with a small yellow flame. The flame self-extinguished but glowing combusion continued until the pile was completely charred
2	91	Cone burned with a small yellow flame. The flame self-extinguished but glowing combusion continued until the pile was completely charred
3	93	No flame observed but flowing combusion of the cone occurred with yellow sparks and grey smoke. Cone completely charred
4	93	No flame observed but flowing combusion of the cone occurred with yellow sparks and grey smoke. Cone completely charred
5	-	No flame observed but flowing combusion of the cone occurred with yellow sparks and grey smoke. Cone completely charred
Mean burning time (excluding test number 5)	90 seconds

The test item was ground before use to allow for a reduction in particle size during handling and transport.

Authors state that the burning time for test 1 for the 1:1 test item: cellulose mixture was not recorded because the extinguishing of the flame was thought to be the end of the reaction, timing device stopped at this point.

The ignition wire broke during 4 of the 5 tests for the 4:1 test item: cellulose mixture. the burning time for test 3 (where the wire did not break) is reasonably typical of the burning times for the test where the wire broke. This shows that the breaking of the wire did not have any significant effect on the burning times.

The values of the current and voltage recorded for test 1 and 2 (4:1 test item: cellulose mixture) indicated a power dissipation of 158 and 199 watts respectively which is outside the method specification. However the author states this did not have a significant effect on burning times.

The current for test 5 (4:1 test item: cellulose mixture) was not recorded prior to the wire breaking and the burning time was not recorded because of a timing device malfunction. The mode of burning for test 5 was typical of the other 4 tests and as the mean burning time of the other 4 test was approximately in the middle of the mean burning times of the two reference mixtures, it was concluded that repeating test 5 was unlikely to affect the classification of the test item with regard to oxidising properties.

Interpretation of results:

Category 3 (oxidising solids) based on GHS criteria

Conclusions:

Diammonium sodium hexakis(nitrito-N)rhodate is classified in Category 3 for oxidising solids in accordance with Regulation (EC) No 1272/2008 of 16 December 2008 on classification, Labelling and Packaging of Substances and Mixtures.

Executive summary:

This is a GLP compliant study following UN method O1 (oxidising solids) which is considered suitable for use for this endpoint.

Diammonium sodium hexakis(nitrito-N)rhodate is classified in Category 3 for oxidising solids in accordance with Regulation (EC) No 1272/2008 of 16 December 2008 on classification, Labelling and Packaging of Substances and Mixtures.

Description of key information

Diammonium sodium hexakis(nitrito-N)rhodate is classified in Category 3 for oxidising solids in accordance with Regulation (EC) No 1272/2008 of 16 December 2008 on classification, Labelling and Packaging of Substances and Mixtures.

Key value for chemical safety assessment

Oxidising properties:

oxidising

Additional information

This is a GLP compliant study following UN method O1 (oxidising solids) which is considered suitable for use for this endpoint.

Diammonium sodium hexakis(nitrito-N)rhodate is classified in Category 3 for oxidising solids in accordance with Regulation (EC) No 1272/2008 of 16 December 2008 on classification, Labelling and Packaging of Substances and Mixtures.

Justification for classification or non-classification

Diammonium sodium hexakis(nitrito-N)rhodate is classified in Category 3 for oxidising solids in accordance with Regulation (EC) No 1272/2008 of 16 December 2008 on classification, Labelling and Packaging of Substances and Mixtures.