Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Phosphoric acid, mono- and bis(branched and linear pentyl) esters is a complex organic mixture (UVCB).

Its two main components, the monoester and the diester, are very soluble in water (according to OECD 105) and are not expected to adsorb strongly on the soil and the sediment based on their low partition coefficient (log Kow < -1) at environmental pH (according to OECD 107) and their adsorption coefficients (log Koc < 3) estimated by valid QSAR models (the HPLC method was not applicable for this strong acid). Based on this information, the mixture was assessed to have a low potential for bioaccumulation and no further test was performed.

The degradation of the substance was investigated according to OECD Guidelines. The monoester and the diester were found stable to hydrolysis and the half-lives were determined above 1 year at all pHs (according to OECD Guideline 111).

A reliable study carried out according to OECD Guideline 301B showed that the registered mixture is not readily biodegradable under the strict conditions of this test (45% of biodegradation at Day 28 based on CO2 evolution). Therefore, the substance is considered as not rapidly degradable in aquatic system.