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EC number: 203-812-5
CAS number: 110-88-3
The inhibition of the degredation activity of activated sludge is not anticipated when introduced in appropriate low concentrations.
The inhibitory effect of 1,3,5-trioxane on microorganisms was
determined in two studies according to OECD guideline 209 (Activated
Sludge, Respiration Inhibition Test). The first study showed a
respiration inhibition of microorganisms using activated sludge from a
municipal sewage treatment plant. The EC10 and EC20 were obtained at 98
mg/L and 270 mg/L, respectively. In the second study activated sludge
from BASF`s sewage treatment plant was used. The results of this study
showed no effect up to the highest test concentration of 500 mg/L after
3 h total exposure. However, since a adaption to the test substance of
the bacteria from the industrial sludge can not be excluded, the results
from the first investigation was taken into account for the PNEC
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