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Adsorption / desorption

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Endpoint:
adsorption / desorption: screening
Data waiving:
study technically not feasible
Justification for data waiving:
other:
Endpoint:
adsorption / desorption: screening
Data waiving:
study technically not feasible
Justification for data waiving:
other:

Description of key information

A key study for the endpoint 'adsorption/desorption' has not been performed for magnesium bis(dihydrogenorthophosphate).  An adaptation from the standard testing regime is justified on the following basis: In accordance with Section 2 of Annex XI of Regulation (EC) No 1907/2006 (REACH), testing is technically not possible as the relevant guideline for a screening study (OECD 121) is not validated for this type of substance and the batch equilibrium method (OECD 106) is not considered to be applicable (see 'discussion').

Key value for chemical safety assessment

Additional information

A batch equilibrium study according to OECD Guideline 106 was deemed to be not applicable to magnesium bis(dihydrogenorthophosphate) for the following reasons:

Firstly, 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.