Registration Dossier

Environmental fate & pathways

Adsorption / desorption

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Link to relevant study record(s)

Reference
Endpoint:
adsorption / desorption: screening
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance has a low octanol water partition coefficient and the adsorption potential of this substance is related to this parameter

Description of key 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.

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

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]