Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

When released into water, ETU (Imidazolidine-2-thione) was found to be extremely stable to hydrolysis over the pH range 5-9 at 90°C for a 3 month period (Cruickshank PA, 1973). Indeed, hydrolysis is not expected to occur due to the lack of hydrolysable functional groups. Volatilization from water surfaces is not expected based upon a Henry's Law constant of 0,04 Pa.m3/mol. Using this Henry's Law constant and an estimation method (Lyman WJ et al; 1990), volatilization half-lives for a model river and model lake are 62 days and 676 days, respectively. Last, ETU has a low potential to bioaccumulate in aquatic species based on a measured log Kow of –0.67.

When released into terrestrial environments, volatilization of ETU from moist soil surfaces is not expected to be an important fate process given a Henry's Law constant of 0,04 Pa.m3/mol . It is not readily biodegradable under aerobic conditions (0 % of biodegradation after 28 days) and is not expected to sorb significantly to soil and sediment (based upon its log Kow value).

ETU is not PBT/vPvB and the chemical safety assessment indicates no unacceptable risk for any environmental compartment (soil, sediment, water) when considering ETU as not biodegradable as a worst-case scenario. Therefore, no further testing is required on ETU biodegradation in any environmental compartment.