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EC number: 205-582-1
CAS number: 143-07-7
No tests are required due to ready biodegradability of category members Fatty Acids.
The category members Fatty Acids are readily
biodegradable. In accordance with column 2 of EC 1907/2006 Annex IX
220.127.116.11 the soil simulation testing is not required for readily
For the sake of completeness available experimental results on
degradation in soil are mentioned for the category member stearic acid (CAS
(1992a) reported a study on the biodegradation of stearic acid in sludge
amended soils. Sludge amended soil (5.0 g) were incubated with 0.1 ppm
and 1.0 ppm of radiolabeled test substance. Degradation was monitored by
respired CO2 which was trapped by potassium hydroxide, counted by LSC
and quantified by calculating against the initial amounts radiolabeled
substance added. The determination of degradation was based on the
recovery rate of 14-CO2. The overall degradation values were 59.48% and
40.93% for 0.1 ppm and 1.0 ppm, respectively after 134 days. The
calculated rate constants were 0.057 day-1 and 0.013 day-1 for 0.1 ppm
and 1.0 ppm, respectively. The corresponding half- lives were reported
to be 12.2 days and 53.2 days.
study performed by Larson (1992b) according to the above mentioned study
design supported theses findings. The tested concentration of 0.1 ppm
revealed a cumulative degradation of 55.96% after 134 days. The half
life and rate constant were not determined.
A Draft Assessment Report (DAR, 2008)
published by the EFSA comprised degradation studies in soil with fatty
acids potassium salts according to BBA IV 4-1 which support a fast
degradation of fatty acids and their derivatives with DT50values
of 1 to 3 days for Fatty Acids (C7-C29) (DAR, 2008).
Reference: Draft Assessment Report (DAR) for
Fatty Acids (C7-C29) (Volume 3, Annex B, Part 4, B.8, August 2008)
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