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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption/desorption studies were not conducted as the substance is inorganic.

Key value for chemical safety assessment

Koc at 20 °C:
49 700

Additional information

In accordance with section 2 of REACH Annex XI, the adsorption/desorption screening study, listed under standard information requirement 9.3.1 of Annex VIII and the further information on adsorption/desorption study, listed under standard information requirement 9.3.3 of Annex IX of the same regulation, do not need to be conducted as the studies are technically not feasible to conduct since the substance is inorganic.

The 72hr adsorption/desorption study (OECD 106) on MnCl2 (a more soluble/readily available form of Manganese (Mn2+)) in 35 different soil types illustrate that adsorption is pH sensitive. A median Kd of 994 ml/g was determined for all soil types used (pH range 3.0-8.5).

For the assessment of trimanganese tetraoxide, the Kd median of 994 ml/g was used to calculate a Koc value of 49700.