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Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Abiotic degradation; Hydrolysis

The study does not need to be conducted because the substance is readily biodegradable.

Phototransformation in air

Direct photolysis probably not relevant due to rapid indirect photolysis and ozone reaction half-lives calculated by QSPR for representative components (highest value taken), little presence in the atmospheric compartment expected.

Phototransformation in water

Deemed photolytically stable, due to water insolubility irrelevantly low levels in light flooded upper water layers expected.

Phototransformation in soil

Deemed photolytically stable, due to ready biodegradability low levels in light flooded upper soil layers expected.


The test item attained 68 % degradation after 28 d with no plateau formation visible, indicating further ongoing degradation (OECD 301 B). However, the 10-day window should not be applied to interpret the results of the test for UVCBs and the substance is regarded as rapidly biodegradable (OECD 301 B, EU Method C.4-C, EPA OPPTS 835.3110 and ISO 10634).


The Log Kow of the submission item was experimentally determined to be > 9.4, as the submission item eluted out of the calibration range. The HPLC showed a distinctive peak indicating a comparable behaviour of the UVCB constituents. It can be assumed that the submission item Log Kow is at least quite close to the cut-off value of 10, which is correlated with low absorption. Therefore, and in combination with the evidenced ready biodegradability the submission item is deemed not bioaccumulative in accordance with ECHA guidance.

Adsorption coefficient

Strong adsorption to organic matter, Koc >> 427,000 and Log Koc >> 5.63 at 30 °C (OECD 121 and EU Method C.19).

Henry’s law constant

Calculated as > 2.1 Pa·m³/moL

Distribution modelling

Water insolubility, ready biodegradation and strong adsorption, mean no relevant concentrations in any compartment can be expected and due to the assumed rapid dissipation only short time for equilibration seems likely. Therefore, the above cited modelling results are of little value for the assessment.

Additional information

The submission item may enter environmental surface waters via Sewage Water Treatment Plants (SWTP) treating industrial sewage waters. According to the use pattern it is not expected that SWTP treating predominantly domestic sludge will be exposed. Therefore the potential exposure of the terrestrial environment from spreading of sludge on agricultural land for manuring is considered to be negligible. In the SWTPs the submission item will rapidly be removed from the water column by ready biodegradation and strong adsorption to the sludge. Due to the expected immobility in soils it seems unlikely that the submission item has a potential to reach groundwater in relevant amounts.

Vaporization to the atmospheric compartment will be irrelevant due to the low vapour pressure. In the troposphere the submission item will be subject to rapid phototransformation by indirect photolysis (hydroxyl radical reaction). It is not expected that the submission item can reach the stratosphere, where it would be degraded predominantly by ozonisation as direct photolysis is probably irrelevant.

Given its susceptibility to biodegradation no relevant levels of the submission item are expected in the environment, where it would shift to sludge, sediment and soil organic materials.