Calcium molybdate

Oxidising properties

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

oxidising solids

Type of information:

experimental 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:

the study does not need to be conducted because the substance is incapable of reacting exothermically with combustible materials

Description of key information

Calcium molybdate has no oxidising properties (see justification for classification or non-classification).

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Justification for classification or non-classification

Read-across from pure MoO₃ to calcium molybdate.

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 MoO₃ has no oxidizing properties.

Read-cross is possible from pure MoO₃ to calcium molybdate, since calcium molybdate also contains molybdenum in oxidation state (VI). Also, calcium molybdate contains a similar mass fraction of oxygen (32.0 %) as does molybdenum trioxide (33.3 %). In both compounds, the molybdenum atom is coordinated by oxide. In consequence it is reasonable that, sufficient for non-classification, calcium molybdate, like the comparable compound MoO₃ would not exhibit oxidising properties.