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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Abiotic degradation:

Air: Based on estimation with the QSAR model AopWin, the substance undergoes in air rapid degradation after reaction with hydroxyl radicals with a DT50 value of 8.18 hours, using the SMILES ((O=C(OCCOC(=O)CCCCCCCCC1)C1). No ozone reaction estimation could be made with AopWin. The estimated half-life is much shorter than 2 days, which is the cut off time for reaching the stratosphere. The substance is therefore not expected to reach the stratosphere and is not a long-range transported chemical in air according to the UNECE criteria (http://www.unece.org/fileadmin/DAM/env/documents/2000/ece/eb/ece%20eb%20air.60.e.pdf). This means that the substance does not have an ozone depletion potential because it does not contain halogens and does not have the potential to reach the stratosphere (EU CLP, EC 1272/2008 and its amendments).

Water: No experimental hydrolysis information is available. A test was not needed because Zenolide is readily biodegradable. Zenolide is an ester and therefore some hydrolysis may be expected.

Biotic degradation: In the key screening study according to OECD TG 301B 100% biodegradation was found after 28 days. This study shows that the substance is readily biodegradable.

Bioaccumulation: The BCF of Zenolide is estimated to be 156 l/kg based on read across with Verdox (Cas no 20298-69-5). When calculating the BCFs for aquatic and terrestrial organisms using QSARs of Veith et al. (1979) and Jager (1998), both incorporated in the EUSES model, BCF values of 253 and 54.4 L/kg w.w., respectively, were found.

Transport and distribution:

Adsorption: The adsorption coefficient (Koc) of the substance has been determined to be 1800 L/kg (log Koc: 3.3), using the HPLC screening method (OECD 121).

Henry's law constant: To assess the volatilisation potential of the substance a Henry's law constant was calculated which gave a result of 0.0427 Pa.m3/mol (at 12 °C). Volatilisation from water will therefore be minimal.

Environmental distribution modelling: Based on Level III environmental distribution modelling using EPISUITE (v4.1 and assuming equal and continuous releases to air, water and soil) using the CAS number 54982 -83 -1 and the measured log Kow, water solubility and vapour pressure as input, it is estimated that the majority of the substance released to the environment will partition mainly into soil (73.6%) and water (24.7%) with small amounts to air (1.26%) and sediment (<1%). The ready biodegradability is not considered here.

The SimpleTreat model, which is incorporated in EUSES, simulates the distribution of the substance in a Sewage Treatment Plant based on vapour pressure, water solubility, log Koc and ready biodegradability. The model predicts that 74.1% of the substance will be degraded and that the remaining substance will partition to sludge (14.9%) and water (11%).