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EC number: 244-005-8 | CAS number: 20748-72-5
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption to the solid soil phase is not expected.
Key value for chemical safety assessment
Additional information
Since no studies on the adsorption potential of (2-hydroxyethyl)ammonium nitrate are available, the assessment has been performed with the substance’s dissociation products.
For 2-aminoethanol a logKoc of 0.067 has been calculated based on estimates from MCI [BASF SE, SRC KOCWIN v2.00, 2010].
The molecule is not expected to adsorb to suspended solids and sediment based upon the logKoc as calculated for the uncharged molecule. However, a pKa value of 9.5 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) 2 -aminoethanol is almost completely present in its charged form (as calculated by the formula: % ionised = 100/(1+10(pKa - pH)): 97% at a pH of 8, 100% at lower pH values).
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 1.16 for pH 7.
Concerning the adsorption potential of sodium nitrate, it can be stated that simple inorganic salts with high aqueous solubility will exist in a dissociated form in an aqueous solution. Such a substance has a low potential for adsorption. In addition a screening study (OECD 121) could not be conducted as it is technically not feasible to perform and QSARs are not suitable for such substances.
Conclusively, adsorption of (2 -hydroxyethyl)ammonium nitrate to the solid soil phase is not expected.
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