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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption to solid soil phase is possible.

Key value for chemical safety assessment

Additional information

The uncharged species of the anion and the cation are not expected to adsorb to suspended solids and sediment based upon the log Koc as calculated for these uncharged molecules by use of SRC PCKOC v2.00 (BASF 2008). However, 1-Ethyl-3-Methylimidazolium ethylsulfate is an ionic liquid which occurs predominantly in its dissociated form as a cation and an anion under environmental conditions. Especially cationic species are found to generally adsorb more strongly to the soils organic carbon and clay than their neutral counterparts. The study performed by Stepnowski (2005) indicates the potential of the cationic part of ionic liquids to bind to the solid soil phase.

The results of the corrected model calculation indicates that the cationic 1-ethyl-3-methyimidazlium ion with a corrected logKoc of 3.05 may bind to solid soil phase due to electrostatic attraction e.g. by clay particles with their positively charged surface. This result perfectly supports the finding of Stepnowski et al. (2005) which also found that ionic liquids bind to soil particles by adsorption. Due these results, it can be assumed, that adsorption to solid soil phase is possible.

Therefore, no further tests on adsorption are performed as such a test is not supposed to reveal any further information which are helpful for the hazard assessment of the substance.