Praseodymium trinitrate

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1995-05-29

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

according to UN recommendations on the transport of dangerous goods

Qualifier:

according to guideline

Guideline:

other: UN Recommendations on the Transport of Dangerous Goods (Manual of Tests and Criteria, Third edition, 1995)

Deviations:

no

Principles of method if other than guideline:

Test described in the United Nations Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, third revised edition, test O.1: Test for oxidizing solids (section 34.4.1). Also known as the conical pile test.

GLP compliance:

no

Contact with:

other: sawdust or cellulose

Key result

Sample tested:

4:1 sample-to-cellulose ratio

Parameter:

mean burning time

Remarks on result:

mixture does not ignite and burn

Key result

Sample tested:

1:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

219 s

Remarks on result:

other: combustion with little flames

Sample tested:

reference: 3:7 mixture potassium bromate + cellulose

Parameter:

mean burning time

Result:

106 s

Remarks on result:

other: combustion with little flames

Sample tested:

reference: 2:3 mixture potassium bromate + cellulose

Parameter:

mean burning time

Result:

61 s

Remarks on result:

other: combustion with little flames

The data presented in the above field named 'Test results (Oxidising solids)' are those obtained during the test performed according to the current UN method.

1) Test according to the UN method in place in 1995:

 

Sample	Ratio sample / sawdust	Burning time (s)				Observations
		N°1	N°2	N°3	Average
Praseodymium trinitrate	4/1	-	-	-	-	No burning. The burning started when the flame was brought in contact with the pile, but stopped immediately after the cut off of the flame. An incomplete reaction was observed.
Praseodymium trinitrate	1/1	525	410	340	425	Burning on the surface of the pile (probably with oxygen from the air)
Ammonium persulfate	1/1	40	34	41	38

The lowest mean burning time obtained for the mixture praseodymium trinitrate/sawdust (ratio 1:1) is more than that of the mixture with ammonium persulphate. Therefore, praseodymium trinitrate is not considered as an oxidizing material according to the UN method in place in 1995.

2) Test according to the current UN method:

Sample	Ratio sample / cellulose	Burning time (s)						Observations
		N° 1	N° 2	N° 3	N° 4	N° 5	Average
Praseodymium trinitrate	4/1	-	-	-	-	-	-	No burning was observed
Praseodymium trinitrate	1/1	135	150	304	229	276	219	Combustion with little flames
Potassium bromate	3/7	113	105	102	107	103	106
Potassium bromate	2/3	85	60	60	46	52	61

The mixture of praseodymium trinitrate / cellulose in the ratio 4 / 1 does not burn.
The mixture of praseodymium trinitrate / cellulose in the ratio 1 / 1 burns with little flames. All the burning times are higher than those of the reference mixture.

According to these results, praseodymium trinitrate is not considered as oxidizer and should not be classified under Division 5.1.

Interpretation of results:

GHS criteria not met

Conclusions:

Praseodymium trinitrate gave a negative result according to the UN method in place in 1995 and according to the current method.
Praseodymium trinitrate is not considered as an oxidizer.

Description of key information

Lodel (1995) studied the oxidising properties of praseodymium trinitrate (99,9% crystallised) according to UN Recommendations on the Transport of Dangerous Goods (Manual of Tests and Criteria, Third edition, 1995). The substance was observed not to be oxidising.

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Justification for classification or non-classification

Praseodymium trinitrate was tested not to have oxidising properties and needs thus not to be classified for this endpoint according to CLP criteria.