Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Adsorption / desorption

An experimental determination of the adsorption coefficient (Koc) for the target substance (Reaction products of diphosphorus pentaoxide and alcohol C7-9-iso, C8 rich, salted with 2-ethylhexylamine) is technically not feasible. The High Performance Liquid Chromatography (HPLC) screening method would not generate a representative result for the surface active substance.

The adsorption coefficient of the read-across substance (Phosphoric acid, mono- and di-(C8 -C10) ester, compds. with C12-14 amine) was carried out using the High Performance Liquid Chromatography (HPLC) screening method specified in the draft of the OECD Guideline 121 (Lumsden, 1999). The test substance was diluted with methanol. The dead time was determined using formamide and acetanilide, phenol, atrazine, isoproturon, naphthalene, fenthion, alpha endosulfan, pyrazophos, phenanthrene, diclofop-methyl and DDT which served as reference standards. The temperature was set to 30 °C and the pH of the mobile phase was measured as 5.9. The measurement of adsorption coefficient should be carried out on substances in their ionised and unionised forms. However the dissociation constants of the test substance are outside the environmental pH range required for this test (it is also not practical to employ such low pH (~3) or high pH (~12) in the test); since adjustment was not environmentally relevant or experimentally practical, measurement was carried out on the ionised form only. A calculated value of adsorption coefficient was derived for each whole salt using a computer-based atom fragment contribution method. The result was logKoc = 4.3 and 6.2. The components of the test substance were also considered and calculated individually. The two acid components gave logKoc values of 1.9 and 3.9, and the amine component gave a logKoc of 2.8. The overall logKoc is in the range < 1.25 - 3.69. The adsorption coefficient (Koc) is therefore in the range < 17.8 - 4930.

Henry´s Law constant and Distribution modelling

No information is available concerning neither the Henry´s Law constant nor distribution modelling for the target substance (Reaction products of diphosphorus pentaoxide and alcohol C7-9-iso, C8 rich, salted with 2-ethylhexylamine). As these endpoints are not mandatory for a registration under REACH Regulation (EC) 1907/2006, no investigations are intended.