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EC number: 500-148-0
CAS number: 61788-89-4
Fatty acids, C18-unsaturated, dimers (CAS No. 61788-89-4) does not meet the OECD criteria for ready biodegradability (<10 %)
Four guideline studies investigating the ready biodegradability of
Fatty acids, C18-unsaturated, dimers (CAS No. 61788-89-4) are available.
The first study was conducted in accordance to OECD Guideline 301B
using domestic non-adapted activated sludge (Bogers & Coenen, 1988) and
a concentration of 20 mg test material /L applied. The biodegradation of
the test substance was determined to be 7.1 % at test termination after
28 days. In a second Modified Sturm Test according to OECD Guideline
301B again domestic non-adapted activated sludge was used and 20 mg test
material/L (Coenen, 1991). The biodegradation of the test substance was
determined to be 6.3 % at test termination after 28 days. A third
biodegradation screening test - a Closed Bottle Test according to OECD
Guideline 301D - with a mixed microbial population taken from the bottom
of aquaria in the laboratory as inoculum (Benijts, 2002) also recorded a
low biodegradation potential (8.7 % after 28 d). Finally, a test
according to ASTM guideline 5864-95 for lubricants or their components
(O'Leary, 1999) using domestic activated sludge which was pre-adapted
with the test substance is available. Despite the pre-adaptation of the
activated sludge, the biodegradation was very low with less than 3.8 %.
In all four studies the biodegradation of the test substance was <
10 % at test termination after 28 days. Thus, Fatty acids,
C18-unsaturated., dimers is not readily biodegradable under conditions
tested according to OECD criteria.
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