Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Biodegradation in water: Screening tests

The target substance (Reaction products of diphosphorus pentaoxide and alcohol C7-9-iso, C8 rich, salted with 2-ethylhexylamine) was used in two different experiments.

Schäfer and Matthews (2009) employed enhancements from Guidance on information requirements and chemical safety assessment Chapter R.7b: Endpoint specific guidance May 2008, including the use of large incubation vessels, the use of dispersal powders, the use of inoculum derived

from both activated sludge and soil and maximizing loading rates for inocula total suspended solids. The test volume of 3 L and the total suspended solids level of 30 mg/L in the test system were consistent with 301B study guidelines. Overall, the study conditions remained inside the boundaries

for the results to be considered for readily biodegradability. Based on the finally determined degradability of 93.9 %, the test substance may be classified as readily biodegradable. Clarke (2009) conducted the experiment according to OECD Guideline 301B with enhanced study duration (35 days), increased test volume (4 L) and biomass (50 mg ss/L). The study fulfils scientific principles and the Dissolved Oxygen Carbon (DOC) was the parameter for determination. At the end of the experiment, the target substance attained 64 % degradation and is therefore not considered as readily biodegradable.

The read-across substance (Phosphoric acid, mono- and di-(C8 -C10) ester, compds. with C12 - 14 amine) was also investigated according to OECD Guideline 301B / EU Method C4.-C (Mead, 1999a). The study was conducted under certificated GLP compliance and last for 28 days exposure duration. CO2 analysis was the parameter of choice since the analysis of Dissolved Organic Carbon (DOC) was not carried out due to the insoluble nature of the test substance in water. After 28 days, 53 % degradation was attained and thus, also the read-across substance cannot be considered as readily biodegradable.

Based on these laboratory-confirmations, both substances can be regarded as not persistent in the environment.

Simulation tests and biodegradation in soil

No information available. In accordance with REACH Regulation (EC) 1907/2006, no results about biodegradation in water and sediment (simulation tests) and / or soil are required.