Diiron trimolybdenum dodecaoxide

Oxidising properties

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

oxidising solids

Type of information:

other: read-across study

Adequacy of study:

supporting study

Study period:

2009-07-14 to 2009-07-21

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2004-09-06

Contact with:

powdered cellulose

Duration of test (contact time):

<= 3 min

Sample tested:

reference: 3:2 mixture potassium bromate + cellulose

Parameter:

mean burning time

Result:

21 s

Remarks on result:

other: Mean of five tests

Sample tested:

reference: 2:3 mixture potassium bromate + cellulose

Parameter:

mean burning time

Result:

66 s

Remarks on result:

other: Mean of five tests

Sample tested:

reference: 3:7 mixture potassium bromate + cellulose

Parameter:

mean burning time

Result:

128 s

Remarks on result:

other: Mean of five tests

Sample tested:

1:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

221 s

Remarks on result:

other: Mean of five tests

Sample tested:

4:1 sample-to-cellulose ratio

Parameter:

mean burning time

Result:

323 s

Remarks on result:

other: Mean of five tests

Due to the fact that both mixtures of the test item with cellulose (4:1 and 1:1) have higher mean burning times compared to the reference mixture in the ratio 3:7, it is concluded that the test item has no oxidizing properties.

Interpretation of results:

GHS criteria not met

Conclusions:

The test item molybdenum trioxide does not meet the classification criteria for oxidizing properties in the sense of the Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, Part 34.4.1 (Test O.1).
The test item molybdenum trioxide does not meet the classification criteria for oxidizing properties in accordance with Regulation (EC) No. 1272/2008 on the classification, labelling and packaging of substances and mixtures ("CLP Regulation").

Reference 2

Endpoint:

oxidising solids

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Description of key information

Testing for oxidising properties is not justified for scientific reasons (see justification for classification or non-classification).

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Justification for classification or non-classification

Despite the fact that iron molybdate based catalysts are in fact used in oxidative processes, classification for oxidising properties in the sense that this would result in a hazard during transport, storage or use is not justified, for the following reasons:

In a test for oxidising properties with pure molybdenum oxide (MoO₃), both mixtures of the test item MoO₃with cellulose (4:1 and 1:1) had higher mean burning times compared to the reference mixture in the ratio 3:7. It is concluded that the test item pure MoO₃has no oxidizing properties. Iron molybdate, similar to MoO₃, also contains molybdenum in its highest oxidation state. Also, iron molybdate contains a mass fraction of oxygen (32.5%) similar to molybdenum trioxide (33.3%). In both compounds, the molybdenum atom is coordinated by oxide. In consequence, it appears scientifically implausible, that - based on the molybdate entity - iron(III) molybdate would exhibit oxidising properties. Iron molybdate also contains iron(III) ions. These have a considerably lower oxidation potential than the reference substances used in tests according to UN method O.1 or EC method A17 (e.g. potassium bromate). The oxidation potentials can be found for example in the CRC Handbook of Chemistry and Physics. Since iron(iii) ions have a relatively low oxidation potential, and combined with the non-classification of MoO₃ based on a test results, testing for oxidising properties for iron molybdate is not justified and iron molybdate does not require classification for oxidising properties. This is also supported by long-term industrial handling, in which no hazardous reactions of this kind have been observed during handling, storage and use of iron molybdate.