Registration Dossier
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EC number: 244-479-6 | CAS number: 21615-47-4
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Ammonium undecafluorohexanoate (CAS 21615-47-4) in not considered to be readily biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
- Type of water:
- freshwater
Additional information
All available information on the biodegradation of ammonium
undecafluorohexanoate (CAS 21615-47-4) was combined in a
weight-of-evidence approach.
An expert statement from the laboratory contracted to perform an
experimental study on biodegradation is available concluding that the
substance is not readily biodegradable (CERI, 2017). This statement is
based on (Q)SAR calculations using BIOWIN v4.10 and experimental results
from structurally similar substances. The (Q)SAR calculations indicate
that ammonium undecafluorohexanoate is not readily biodegradable.
Experimental results for the structurally similar substances
perfluorooctanoic acid, ammonium salt (CAS 3825-26-1) and 1H, 1H,
7H-dodecafluoroheptanol (CAS 335-99-9) were discussed in the available
statement and revealed that they are not readily biodegradable as well.
The two studies were performed according to OECD 301C and resulted in
degradation of 7 and 9% after 28 d (based on BOD), respectively.
In addition the biodegradation of perfluorohexanoic acid was
investigated in an experimental study according to OECD 301 D (Saez et
al., 2008). Activated sludge from a sewage treatment plant treating
predominantly domestic sewage was used as inoculum and the test item was
applied at a concentration of 4 mg/L. After four weeks approx. 15% of
the substance was degraded. The degradation increased to approx. 45%
after 15 weeks indicating a poor degradability. The degradation was
determined by HPLC/MS analysis.
All available data indicate that Ammonium undecafluorohexanoate is not
expected to be readily biodegradable according to the OECD criteria.
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