Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Biodegradability:

Two Klimisch-1-rated studies were carried out on ready biodegradability, i.e. a CO2 evolution test (1996) and a manometric respirometry test. Whereas in the CO2 evolution the test substance failed slightly the 60% degradability criteria, the study with the manometric respirometer revealed a grade of degradability of 94%, thus the substance clearly was ready biodegradable. Since the manometric respirometry test was considered to have delivered the data of higher validity and reliability, in accordance with the weight of evidence approach undecylenic acid is assessed as readily biodegradable.

Adsorption/desorption:

At the test conditions (HPLC method), the adsorption coefficient was found to be log Koc = 2.84 (Koc 691.83). This result is close to the log Koc 2.77 of reference substance acetanilid, which represents the lower end of adsorbability of the reference substances used. Therefore test item undecylenic acid can be considered as a less adsorptive substance.

All other tests were waived due to the properties of the substance.