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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Description of key information

In accordance with Column 2 of Annex VIII Section 9.3.1 of the REACH regulation, adsorption/desorption screening does not need to be conducted as the substance decomposes rapidly (hydrolytically unstable).
The hydrolysis product of the test substance, MDSA, is a substance with pKa values (Pallas) of -1.81 and -1.21. This means that in the whole environmental relevant pH range, the substance will be fully ionized. This substance is thus expected to have a very low potential for adsorption, which is confirmed by the estimated value from the QSAR.
Also the other hydrolysis product, formaldehyde, is expected to have a low potential for adsorption based on the estimated value by QSAR.

Key value for chemical safety assessment

Koc at 20 °C:
10

Additional information

The test substance MMDS is not likely to adsorb to sediment or soil particles as the substance is hydrolytically unstable.

The hydrolysis product MDSA is a substance with pKa values (Pallas) of -1.81 and -1.21. This means that in the whole environmental relevant pH range, the substance will be fully ionized. This substance is thus expected to have a very low potential for adsorption as soils are negatively charged. As a pragmatic approach, a Koc value of 10 is chosen for chemical safety assessment purpose. This pragmatic value of Koc for MDSA is confirmed by the QSAR KOCWIN (V2.00) estimated value of 3.4 L/kg (logKoc 0.5323). Although it is recognized that this QSAR estimated value is related to the neutral form of the substance, it is deemed acceptable to assume that the ionized substance will have an even lower potential for adsorption.

Also the other hydrolysis product, formaldehyde, is not expected to have a high adsorption potential as the estimated Koc by the QSAR KOCWIN (V2.00) is 7.75 L/kg (logKoc 0.889).