Reaction mass of undec-8-enal and undec-9-enal and undec-10-enal

Endpoint summary

Description of key information

General discussion of environmental fate and pathways

Abiotic degradation

Air: Based on estimation with the QSAR model Aopwin the substance undergoes in air rapid degradation after reaction with hydroxyl radicals. The DT50 value after reaction with hydroxyl radicals is 1.4 or 1.3 hours for cis or trans isomers respectively, as presented by EpiSuite. Reaction with ozone gave DT50 values or 2.1 and 1.4 hours for cis and trans isomers respectively. Based on these values, the substance will not reach the stratosphere and is therefore not considered to be a long-range transported chemical in air. 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 (GHS, EU CLP, 2008 and its amendments).

Water: The substance has no hydrolysable groups and is also readily biodegradable. Hydrolysis DT50 is estimated to be > 1 year.

Biotic degradation

Biodegradation for Intreleven aldehyde is concluded based on read across from Floral Super (CAS no.71077-31-1) being readily biodegradable. Floral Super was biodegraded by 84% at day 28 in the standard Closed Bottle screening test (OECD TG301D, GLP).

Bioaccumulation

Solely based on the log Kow of 4.47 (OECD TG123, GLP), it can be concluded that the substance has some bioaccumulation potential with calculated BCF values for aquatic and terrestrial organisms of 1260 and 355 L/kg, respectively.

Transport and distribution

The adsorption potential of the substance was determined in a study according to OECD TG 121 (HPLC method). Under the conditions of the test, the log Koc of the substance was determined to range from 1.58 to 4.25 (equivalent Koc = 38.3 - 17700 L/kg). The main constituent detected, contributing to 84% of the total content analysed by HPLC, had a Koc value of 2089.3 L/kg (log Koc 3.32). Based on this value it may be concluded that the substance has potential for adsorption to soil.

A Henry's law constant of 19.7 Pa·m³/mol (at 12 °C) was calculated in EUSES (MW = 168.28; Vap pressure 6.04 Pa (24°C); 26.1 mg/l water solubility (24°C). Based on this value the substance has potential to partition from water to air.

Based on Level III environmental distribution modelling using EPISUITE (assuming equal and continuous releases to air, water and soil) using the CAS number 58296 -81 -4 and the measured physico-chemical parameters (water solubility and log Kow) as input, it is estimated that the majority of the substance released to the environment will partition mainly into soil (73.1%) and water (26.4%) with small amounts to air (0.32%) and sediment (0.17%).

The SimpleTreat model simulates the distribution of the substance in a Sewage Treatment Plant. Model calculations (default assumptions, local) show that 70.4% of the substance will be degraded and that 9.7%, 15.3%, and 4.6% will partition to water, sludge and air, respectively.