Registration Dossier
Registration Dossier
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EC number: 244-169-0 | CAS number: 21049-70-7
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption to the solid soil phase is not to be expected.
Key value for chemical safety assessment
Additional information
Since no studies on the adsorption potential of 2 -(methylamino)ethanol, compound with sulphur dioxide are available, the assessment has been performed with the substance's dissociation products.
For 2-methylaminoethanol (CAS 109-83-1) a logKoc of 0.14 has been calculated based on estimates from MCI [SRC KOCWIN v2.00, 2010]. This value refers to the uncharged molecule (pKa: 9.95). The pKa 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 KOC-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) 2-methylaminoethanol is almost completely present in its charged form. To consider the pH-dependent molecule speciation, the calculated logKoc was therefore pH-corrected by a calculation method developed by Franco & Trapp (2008) which resulted in a logKoc of 1.33 for pH 7. Additionally considering the low logPow (-0.91) and the ready biodegradability of 2-methylaminoethanol, adsorption is not expected to play an appreciable role in the environmental fate of the substance.
Simple inorganic salts like the read-across substance sodium sulphite (CAS 7757-83-7) with high aqueous solubility will exist in a dissociated form in an aqueous solution. Such a substance has a low potential for adsorption.
Conclusively, adsorption of 2 -(methylamino)ethanol, compound with sulphur dioxide to the solid soil phase is not expected.
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