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No experimental data addressing the adsorption/desorption properties of tetrairon tris(pyrophosphate) are available.

The reasons for this are as follows:

According to Annex XI, Section 2 of Regulation (EC) No. 1907/2006 (REACH) testing for a specific endpoint may be omitted if it is technically not possible to conduct the study as a consequence of the properties of the substance itself. A study to investigate the adsorption / desorption characteristics of tetrairon tris(pyrophosphate) has not been conducted. The justifications for not providing these data are as follows:

- A screening study according to OECD Guideline 121 is not technically possible as the test method is not validated for inorganic substances.

- A batch equilibrium study according to OECD Guideline 106 was deemed to be not applicable to tetrairon tris(pyrophosphate) for the following reasons:

Firstly, both iron and pyrophosphate (and the breakdown product orthophosphate) are natural constituents of soils and as such analysis of the test material may not be possible due to interference from the soil extracts that may leach into the aqueous media during the test. This would prevent quantification of the test material.

In addition, the mobility of the test item would be dependent on the anion exchange capacity of the soils as the main component of the test material is an anion. This absorption relationship would not be anticipated to correlate with the organic carbon content of the soils and is considered to be beyond the scope of the OECD 106 method.

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