Registration Dossier

Diss Factsheets

Environmental fate & pathways

Bioaccumulation: aquatic / sediment

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

MDI MT is very unstable in aqueous media and reacts with water to form predominantly high molecular weight, inert polyurea. The Heimbach study gives supporting evidence that MDI accumulation through aquatic food chains is very unlikely to happen.
Although a log Pow of 4.51 for monomeric MDI was measured, that value is only of theoretical interest as MDI is very unstable in aqueous media (Yakabe et al, 1994). PMDI reacts with water to form high molecular weight, inert polyurea and trace amounts of 4,4'-diamino-diphenylmethane (MDA). The latter has a log Pow value of 1.55 and its measured BCF was < 14 (at 0.2mg/l) in Cyprinus carpio (EU Risk Assessment Report: 4,4'-Methylenedianiline).

Key value for chemical safety assessment

Additional information