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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption to solid soil phase is not expected. 

Key value for chemical safety assessment

Additional information

The pKa for the test substance was calculated to be 3.79 using SPARC (v4.6). This value indicates that the test substance will exist primarily as an anion in the environment (pH 4 to 9). In contrast to positively charged cations which generally adsorb stronger to sediment and soils containing organic carbon and clay than their neutral counterparts, anions are expected to adsorb to a lesser extent to soil, sediment and humic acids because these are negatively charged as well. Regarding the charged molecule at pH 7 the log Koc was estimated to be 2.29 (Koc = 193) following the method of Franco & Trapp (2008) and using the pKa of 3.79 (from SPARC v4.6 calculation).

The log Koc for the uncharged molecule was calculated to be approx. 3.36 using EPIWin (v4.10) (BASF SE, 2012).