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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption to solid soil phase is not to be expected under environmentally relevant conditions.

Key value for chemical safety assessment

Additional information

Experimental data on the adsorption coefficient of the charged molecule are only available for the structurally similar substance 4,4´-Diamino-3,3´,5,5´-tetramethyl-dicyclohexylmethan (CAS 65962 -45 -0). The log Koc was determined to be 2.6 at 23 °C and pH 7.0 following the OECD guideline 121 (BASF SE, 2013). At pH 9 no reliable Koc could be determined as the retention time on the HPLC system was larger than for the reference substances (log Koc > 5.63). As 98% of the European soils have a pH within a range of 5 to 8, the value determined at pH 9 is not relevant for the assessment of the substances environmental fate.

In conclusion, adsorption to solid soil phase is not to be expected under environmentally relevant conditions.