Registration Dossier

Environmental fate & pathways

Adsorption / desorption

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Description of key information

The Koc of the substance was calculated to be 10.5 L/kg and 1.4 L/kg (logKoc = 1.0 and 0.15) following the Molecular Connectivity Index and the Log Kow method, respectively (KocWIN, US EPA, 2011).

Key value for chemical safety assessment

Koc at 20 °C:
6

Additional information

Since the test substance's physicochemical properties indicate a low potential for adsorption, no study needed to be conducted according to REACH Annex VIII 9.3.1 column 2. Nevertheless, QSAR estimates of the Koc were made (KocWIN, US EPA, 2011) showing Koc values of 10.5 L/kg and 1.4 L/kg (logKoc = 1.0 and 0.15) following the Molecular Connectivity Index and the Log Kow method, respectively. The mean value (Koc = 6 L/kg; log Koc = 0.8) was taken for the chemical safety assessment. As the pKa of NMMO is relatively low (5.1), this substance is considered to be predominantly in its non-ionised form under environmentally relevant conditions and no correction for the charged molecule was made.

[LogKoc: 0.8]