Hexachloroiridic acid

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

migrated information: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

03 November 2010 to 22 December 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP Compliant, guideline study, available as unpublished report, acceptable with restrictions

Qualifier:

equivalent or similar to guideline

Guideline:

other: Regulation (EC) No 1272/2008 Classification, Labelling and Packaging of Substances and Mixtures, using a procedure designed to be compatible with Test O.1 of United Nations Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria

Deviations:

yes

Remarks:

electrical resistance of ignition wire was 3.9 Ω/m, rather than 6.0 ± 0.5 Ω/m as specified in Test O.1. Physical parameters of wire and power dissipation met method specifications therefore the deviation had no effect on the test.

GLP compliance:

yes (incl. QA statement)

Contact with:

other: cellulose

Duration of test (contact time):

3 min

Sample tested:

other: not specified (migrated information)

Parameter:

other: not specified (migrated information)

Remarks on result:

other: result not specified (migrated information)

Remarks:

The results indicate that the test item is not an oxidising solid.

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
Mean	136
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:

other: Test item has been deternmined 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

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, guideline study 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, hexachloroiridic acid, hydrogen hexachloroiridate (IV) is not considered to be oxidising.

Key value for chemical safety assessment

Oxidising properties:

no

Additional information

The oxidising properties of hexachloroiridic acid, hydrogen hexachloroiridate (IV) are read across from other substances with halogen ligands or counter ions in the 3+ oxidation state (rhodium triiodide). This substance is not oxidising based on GLP-compliant, guideline experimental study (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 these substances are oxidants.

On the basis of read-across hexachloroiridic acid, hydrogen hexachloroiridate (IV) 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, hexachloroiridic acid, hydrogen hexachloroiridate (IV) is not classified for oxidising properties.