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Oxidising properties

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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:
according 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, deviation from the electrical resistance of 6.0 ± 0.5 Ω/m, physical parameters of wire and power dissipation met method specifications therefore no effect on test
GLP compliance:
yes (incl. QA statement)
Contact with:
powdered cellulose
Duration of test (contact time):
3 min
Sample tested:
1:1 sample-to-cellulose ratio
Parameter:
mean burning time
Remarks on result:
mixture does not ignite and burn
Sample tested:
4:1 sample-to-cellulose ratio
Parameter:
mean burning time
Remarks on result:
mixture does not ignite and burn

Results of 3:7 (by mass) reference mixture Potassium bromate and cellulose
Test Number Burning time (s) Observations
1 147 Orange and blue flame, spitting and spluttering leaving a dark grey ash
2 139 Orange and blue flame, spitting and spluttering leaving a dark grey ash
3 116 Orange and blue flame, spitting and spluttering leaving a dark grey ash
4 133 Orange and blue flame, spitting and spluttering leaving a dark grey ash
5 145 Orange and blue flame, spitting and spluttering leaving a dark grey ash
Results of 4:1(by mass) test item and cellulose mixture
1  - Dark grey smoke, no sign of ignition during the 3 minutes the power was applied
2  -  Dark grey smoke, no sign of ignition during the 3 minutes the power was applied
3  -  Dark grey smoke, no sign of ignition during the 3 minutes the power was applied
4  -  Dark grey smoke, no sign of ignition during the 3 minutes the power was applied
5  -  Dark grey smoke, no sign of ignition during the 3 minutes the power was applied
Results of 1:1 (by mass) test item and cellulose mixture
1  -  Grey smoke, no sign of ignition during the 3 mintues the power was applied
2  -  Grey smoke, no sign of ignition during the 3 mintues the power was applied
3  -  Grey smoke, no sign of ignition during the 3 mintues the power was applied
4  -  Grey smoke, no sign of ignition during the 3 mintues the power was applied
5  -  Grey smoke, no sign of ignition during the 3 mintues the power was applied

The 4:1 and 1:1 test item:cellulose mixtures did not ignite and burn during the 3 minutes that the power was applied indicating test item is not an oxidising solid.

Interpretation of results:
GHS criteria not met
Conclusions:
Rhodium triiodide has been determined not be an oxidising solid as both the 4:1 and 1:1 test item to cellulose test mixtures failed to ignite during the 3 minutes that the power was applied.
Executive summary:

This is a GLP compliant study following UN guideline O.1 and is considered suitable for use as the key study for this endpoint. Rhodium triiodide has been determined not be an oxidising solid as both the 4:1 and 1:1 test item to cellulose test mixtures failed to ignite during the 3 minutes that the power was applied.

Endpoint:
oxidising solids
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Justification for type of information:
REPORTING FORMAT FOR THE ANALOGUE APPROACH

1. HYPOTHESIS FOR THE ANALOGUE APPROACH

For the assessment of oxidising properties substances have been split into groups of similar substances in the same oxidation state and with similar ligands. Oxidising properties of different substances within these groups are considered to be similar. Both the source and target substance are metals in the 3+ oxidation state with a halogen ligand and therefore read across is considered to be appropriate.

2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)

Source: Rhodium triiodide
Target: Triammonium hexachlororhodate

3. ANALOGUE APPROACH JUSTIFICATION

For oxidising properties the structural alerts indicating potential hazards are often associated with the ligands or counter-ions, and therefore the read across approach has taken into account the ligands associated with precious metal substances. Both rhodium triiodide and triammonium hexachlororhodate have a metal in a 3+ oxidation state and a halogen ligand. Rhodium triiodide has been tested for oxidising properties and found to be non-oxidising. Based on the similarity of structure between this substance and triammonium hexachlororhodate, this result is read across to triammonium hexachlororhodate and this substance is also considered to be non-oxidising.
Reason / purpose for cross-reference:
read-across source
Sample tested:
1:1 sample-to-cellulose ratio
Parameter:
mean burning time
Remarks on result:
mixture does not ignite and burn
Sample tested:
4:1 sample-to-cellulose ratio
Parameter:
mean burning time
Remarks on result:
mixture does not ignite and burn

Results of 3:7 (by mass) reference mixture Potassium bromate and cellulose
Test Number Burning time (s) Observations
1 147 Orange and blue flame, spitting and spluttering leaving a dark grey ash
2 139 Orange and blue flame, spitting and spluttering leaving a dark grey ash
3 116 Orange and blue flame, spitting and spluttering leaving a dark grey ash
4 133 Orange and blue flame, spitting and spluttering leaving a dark grey ash
5 145 Orange and blue flame, spitting and spluttering leaving a dark grey ash
Results of 4:1(by mass) test item and cellulose mixture
1  - Dark grey smoke, no sign of ignition during the 3 minutes the power was applied
2  -  Dark grey smoke, no sign of ignition during the 3 minutes the power was applied
3  -  Dark grey smoke, no sign of ignition during the 3 minutes the power was applied
4  -  Dark grey smoke, no sign of ignition during the 3 minutes the power was applied
5  -  Dark grey smoke, no sign of ignition during the 3 minutes the power was applied
Results of 1:1 (by mass) test item and cellulose mixture
1  -  Grey smoke, no sign of ignition during the 3 mintues the power was applied
2  -  Grey smoke, no sign of ignition during the 3 mintues the power was applied
3  -  Grey smoke, no sign of ignition during the 3 mintues the power was applied
4  -  Grey smoke, no sign of ignition during the 3 mintues the power was applied
5  -  Grey smoke, no sign of ignition during the 3 mintues the power was applied

The 4:1 and 1:1 test item:cellulose mixtures did not ignite and burn during the 3 minutes that the power was applied indicating test item is not an oxidising solid.

Interpretation of results:
GHS criteria not met
Conclusions:
Rhodium triiodide has been determined not be an oxidising solid as both the 4:1 and 1:1 test item to cellulose test mixtures failed to ignite during the 3 minutes that the power was applied.
Executive summary:

This is a GLP compliant study following UN guideline O.1 and is considered suitable for use as the key study for this endpoint. Rhodium triiodide has been determined not be an oxidising solid as both the 4:1 and 1:1 test item to cellulose test mixtures failed to ignite during the 3 minutes that the power was applied.

Description of key information

Based on read across from rhodium triiodide, triammonium hexachlororhodate is not considered to be oxidising.

Key value for chemical safety assessment

Oxidising properties:
no

Additional information

The oxidising properties of triammonium hexachlororhodate are read across from another substance with a halogen ligand in the 3+ oxidation state (rhodium triiodide). This substance is not oxidising based on a GLP-compliant study following UN method O.1 (Atwal and Tremain 2011). There is also supplementary evidence that other metal chlorides are also not oxidizing. For example, other Group VIII transition metals such as cobalt (II) chloride, iron (II), iron(III) and nickel(II) chloride. Copper(I) chloride from the adjacent Group IB is also not classified for oxidizing properties. There is therefore no evidence that any transition metal chloride is an oxidant. Supplementary evidence also comes from the non-transition metal chlorides and there is no evidence from two centuries of industrial and academic experience that supports this substance as non-oxidising.

 

On the basis of read-across triammonium hexachlororhodate is not classified as an oxidising solid

Justification for classification or non-classification

Based on read across from a GLP-compliant, guideline study with rhodium triiodide, triammonium hexachlororhodate is not classified for oxidising properties.