Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The logKoc value of the structural analogue of the substance Reaction mass of tetrasodium phosphonoethane-1,2-dicarboxylate and hexasodium-phosphonobutane-1,2,3,4-tetracarboxylate was determined to be < 1.77 (Koc < 58.9)
Key value for chemical safety assessment
- Koc at 20 °C:
- 58.9
Additional information
No data on the Adsorption/Desorptiony of the substance is available. The results from the structural analogue Reaction mass of tetrasodium phosphonoethane-1,2-dicarboxylate and hexasodium-phosphonobutane-1,2,3,4-tetracarboxylate are used instead (for details see reporting Format as attached to section 13 in the IUCLID dossier).
One key study is available in which the soil adsorption coefficient of Reaction mass of tetrasodium phosphonoethane-1,2-dicarboxylate and hexasodium-phosphonobutane-1,2,3,4-tetracarboxylate has been determined according to a method equivalent to the EU method C.19 of the Commission directive 92/69/EEC and the GLP. The determination has been performed by the HPLC method. Under the conditions of the test, the test material showed negligible retention on the HPLC column. The logKoc of the sample was deduced by direct comparison of the sample retention time that of a standard having the low logKoc value (i.e. Simazine, logKoc = 1.77). Therefore, the logKoc value of Reaction mass of tetrasodium phosphonoethane-1,2-dicarboxylate and hexasodium-phosphonobutane-1,2,3,4-tetracarboxylate was determined to be < 1.77 (Koc < 58.9). Based on this result, Reaction mass of tetrasodium phosphonoethane-1,2-dicarboxylate and hexasodium-phosphonobutane-1,2,3,4-tetracarboxylate has a low potential of adsorption onto soil.
It should be noted that the retention time of the test substance was shorter than the dead time. Therefore, the conditions of the HPLC was maybe not appropriate to this substance. But similar result is estimated by the PCKOCWIN model (v.1.66), confirming the low potential for adsorption onto soil and sediment. Therefore, this study is considered as reliable with restrictions.
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