Diiron tris(sulphate)

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:

supporting study

Study period:

08 June 2010-18 June 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Valid and conclusive guideline study under GLP; Relevant and adequate for this endpoint

Qualifier:

according to guideline

Guideline:

EU Method A.17 (Oxidising Properties (Solids))

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: United Nations (UN), UN no. ST/SG/AC.10/11/Rev.4: Recommendations on the Transport of Dangerous Goods, Part III: Classification Procedures, Test Methods and Criteria Relating to Explosives of Class 3, Class 4, Division 5.1 and Class 9, Test O.1 , 2003.

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Contact with:

powdered cellulose

Sample tested:

reference mixture (not specified)

Remarks:

migrated information

Parameter:

maximum burning rate

Result:

115 s

Sample tested:

test mixture (not specified)

Remarks:

migrated information

Parameter:

maximum burning rate

Result:

> 180 s

The burning times of the reference mixtures and the test substance are given in the tables below.

The burning time of the test substance was significantly longer than the burning time of 3:7 (w/w) Potassium bromated:cellulose. Based on this it was concluded that the test substance has no oxidizing properties (Not Division 5.1).

Table: Burning times of Potassium bromate/cellulose mixtures

Potassium bromated:cellulose (w/w)	Burning time [s]	Mean burning time [s]
3:7	108	104
	115
	95
	115
	85

Table: Burning times of test substance/cellulose mixtures

Test substance/cellulose (w/w)	Burning time [s]	Mean burning time [s]
4:1	*	n/a
	*
	*
	*
	*
1:1	>180	>180
	>180
	>180
	>180
	>180

* The mixture did not ignite or burn.

Interpretation of results:

other: no oxidising properties

Remarks:

Migrated information

Conclusions:

Based on the results obtained it was concluded that the test substance has no oxidizing properties (Not Division 5.1).

Description of key information

Assessed regarding the chemical nature

Key value for chemical safety assessment

Oxidising properties:

no

Additional information

Testing for this endpoint has been waived in accordance with column 2 restrictions. Both, ferrous and ferric salts have no relevant oxidizing properties.

Available data

Ferric chloride (FeCl3) is generally a known to be mild oxidising agent (O'Neil et al 2006). The oxidation potential of the ferric ion can be represented by the equilibrium formula for:

Fe(2+) = Fe(3+) + e^-

with the standardized redox potential Eo = 0.771 + 0.0591 ∙ Log [Fe³⁺] / [Fe²⁺]

(Pourbaix & Zoubov 1966).

A reliable screening test for oxidising properties conducted in accordance with UN method O.1 and with EU A.1 has demonstrated that the solid salt form of ferric sulphate gives a negative response. In conclusion ferric salts can be regarded as non-oxidising in the context of the criteria by which this hazard is defined for regulatory purposes (Baltussen 2010 study 492704) as long as the remaining ions are comparably inert, which can be assumed considering the oxidation states. It can therefore be concluded from this experiment that all ferric salts in the soluble iron salt category that behave comparably and thus do not exhibit relevant oxidising properties.

• Baltussen E (2010). Determination of physico-chemical properties of 202026/C. Testing laboratory: NOTOX B.V., 's-Hertogenbosch, The Netherlands. Report no. 492704. Owner company: ReachCentrum SPRL, P-I236 AlFe REACH Consortium (Iron Salts sub-consortium), Brussels, Belgium. Report date 2010-10-04.
• O'Neil MJ, Heckelman PE, Koch CB, Roman KJ eds (2006). The Merck Index. An encyclopedia of Chemicals, Drugs, and Biologicals. 14th edn. ISBN: 978-0 -911910-00-1. Whitehouse Station, NJ, U.S.A. Merck and Co. 1740 p.
• Pourbaix N, Zoubov N (1966). Section 12.1: Iron (pp. 307-21). In: Pourbaix M (ed) Atlas of Electrochemical Equilibria in Aqueous Solution. Pergamon Press.

Justification for classification or non-classification

The following statements base on DSD, the Commission Directive 2001/59/EC (28th ATP of Council Directive 67/548/EEC), and CLP (5th ATP of Regulation (EC) No 1272/2008 of the European Parliament and of the Council) as implementation of UN-GHS in the EU:

The submission item is considered non-oxidizing on the basis of its chemical nature and composition. The ferric (Fe+3) kation is however a mild oxidising agent not sufficient for classification. This is confirmed by a guideline study for the ferric sulphate, which was found non-oxidizing according to the applicable standards.