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EC number: 204-677-5
CAS number: 124-07-2
Table 1: Extinction of the test substances
solutions after 16 - 20 h
Extinction at 436 nm
Arithm. mean of replicates
Replicate without inoculum
Table 2: Extinction after 16 - 20 h in the
reference substance and the blank control
respect to the historical test with the reference substance methanol, it
can be concluded that the test conditions were optimal and the results
EC10 (18 h) = 912 mg/L (ISO 10712)
One reliable study, investigating the toxicity of the substance to
Pseudomonas putida, is available for octanoic acid. This cell
multiplication inhibition test (1988) was conducted similarly to ISO
10712. The test organism was exposed to a wide range of nominal
concentrations (0.266 - 1088.00 mg/L). The study determined an EC10
(18h) of 912 mg/L (nominal).
A further study report (1978) is available with biological seed as
the test organisms, but was rated unreliable (RL3) due to inconsistent
results and poor reporting.
Supportive information is withdrawn from short abstracts of two
publications. In the first study (Freese, 1979) conducted with Bacillus
subtilis, a EC50 of 0.25 mmol/L was obtained after 60 min. In the second
study (Powell and May, 1981) with six different bacterial strains
incubated anaerobically, different sensitivity of the various organisms
to decanoic acid were observed. However, due to limited documentation
and consequently limited information, these two literature studies were
rated as not assignable.
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