Registration Dossier
Registration Dossier
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EC number: 200-888-1 | CAS number: 75-64-9
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption to solid soil phase is not expected.
Key value for chemical safety assessment
Additional information
A calculated logKoc of 1.56 is available (BASF AG, SRC PCKOC v1.66, 2007). This value refers to the uncharged molecule (pKa value: 10.45 - 10.86). This pKa value indicates that the molecule will exist primarily as a cation in the environment and cations generally adsorb stronger to soils containing organic carbon and clay than their neutral counterparts. Hence, the PCKOC-model may underestimate adsorption to organic carbon since it does not consider the ionic structure of the molecule. Under environmental conditions (pH from 5 to 9) the test substance is almost completely present in its charged form (as calculated by the formula % ionised = 100/(1+10(pKa - pH)): 97% at a pH of 9, 100% at lower pH values). In a calculation conducted according to a publication by Franco & Trapp, 2008 using the parameters pKa = 10.45 and log Pow = 0.4 a log Koc value of 4.39 was determined.
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