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EC number: 252-552-9
CAS number: 35415-27-1
The study used as source investigated the adsorption coefficient on soil
and sewage sludge of 1,2,4 -Benzenetricarboxylic acid, decyl octyl ester
according to OECD Guideline for the Testing of Chemicals No. 121 and
EU-Method C.19. As the retention time of the test item lies outside the
range of the method and the range of the reference items, the log Koc of
the test item was stated as > 5.67. Results of the source compound were
considered applicable to the target compound. Justification and
applicability of the read-across approach (structural analogue) is
outlined in the read-across report in section 13 or find a link in
cross-reference “assessment report”.
The derived log Koc (HPLC method) was > 5.67
No adsorption / desorption data for the submission substance is
available. However adequate and reliable data for structural anologues
(i.e. C8TM, for read-across justification please see read-across report
in section 13) are reported below.
A reliable study on adsorption / desorption according to OECD 121 is
available (LAUS, 2009, RL1, analogue substance:
1,2,4-benzenetricarboxylic acid, mixed decyl and octyl triesters,
C8C10TM, CAS no. 90218-76-1). The HPLC screening method was applied, and
the study was conducted in compliance with GLP. The result of the test
led to an indicative log Koc (i.e., log Koc > 5.67), because the test
substance had a log Koc above the all reference substances.
In detail, after several preliminary tests, a saturated solution of the
test substance was injected. The corresponding chromatogram showed a
retention time, which was higher than the retention time of the
reference substance with the highest log Koc, i.e. DDT (log Koc 5.67),
and therefore the log Koc of the test substance lay outside the range of
the method. In order to ascertain that the retention time of the test
substance was higher than the retention time of DDT, the retention times
of DDT and of the test item were determined three times.
In conclusion, the log Koc of the test substance was determined as >
5.67 (analogue substance: C8C10TM).
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