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EC number: 232-304-6
CAS number: 8002-26-4
A complex combination of tall oil rosin and fatty acids derived from acidulation of crude tall oil soap and including that which is further refined. Contains at least 10% rosin.
2: Results of the Activated Sludge, Respiration Inhibition Test of
Distilled Tall Oil
c / Loading rate (mg/L)
(mg O2/L x h)
* With reference to the validity criterion of OECD-Guideline 209, that
recommends a deviation of respiration rates of the two controls of ≤15
%, the result of inhibition of the Test Item Distilled
Tall Oil of
12.4 % was not regarded
as a definite inhibition.
A 3 h-EL50 of > 100 mg/L and a NOELR of ~100 mg/L.
Water Accommodated Fractions (WAFs) of Distilled Tall Oil caused no
acute toxic effects on bacteria in an Activated Sludge, Respiration
Inhibition Test as a Limit Test conducted in accordance to OECD 209. A 3
h-EL50 of > 100 mg/L and a NOELR of~100 mg/L have been
determined for the test substance.
is not considered necessary to derive a PNEC or conduct risk
characterisation for DTO in biological WWTP (sewage treatment plant) for
the following reasons:
(and the majority of its constituents are naturally-occurring and well
tolerated by environmental organisms)
has been reliably demonstrated to be readily biodegradable by activated
a typical WWTP, sewage organisms are exposed to DTO as a whole
substance. Samples of DTO (tested as water-accommodated fractions)
caused no acute toxic effects on microorganism in a standard activated
sludge respiration inhibition (ASRI) test.
is therefore very unlikely that DTO would cause inhibitory effects on
microorganisms present in STP.
of PNEC for WWTP micro-organisms
for WWTP micro-organisms for DTO will not be determined based on
available study since DTO does not cause inhibitory effects to
microorganisms in sewage treatment plants.
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