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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Not readily biodegradable: 12 - 15% (CO2 evolution) in 28 days (OECD 301 B)

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

Ready biodegradability of 2-hexyldecanoic acid[4-(6-tert-butyl-7-chloro-1H-pyrazolo[1,5-b][1,2,4]triazol-2-yl)phenylcarbamoyl]methylester (UM-235) was investigated in a study by Desmares-Koopmans (2003). This test was performed according to OECD Guideline 301 B under GLP conditions using domestic activated sludge as inoculum. UM-235 was incubated at a concentration of 17.5 mg/L corresponding to 12 mg TOC/L at 22 – 22.8 °C. At the end of the test, UM-235 reached 13.5% biodegradation (mean value of two replicates). Since the pass level of 60% was not achieved, the test substance is considered to be not readily biodegradable. The results from the toxicity control containing test and reference substance (> 25% biodegradation within 14 days) indicate that UM-235 has no inhibitory effect on the activity of the sludge microorganisms.