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EC number: 201-545-9
CAS number: 84-61-7
NOEC (3h, activated sludge of a predominantly domestic sewage) > 100 mg/L
inhibitory concentration of dicyclohexylphthalate on the respiration of
aerobic waste water bacteria was determined in a mixed population of
activated sludge of a predominantly domestic sewage. The test method
followed the OECD Guidelines for Testing of Chemicals No. 209.
The test item was directly weight into the
test vessels. The respiration rates of the activated sludge treated with
the test item at a concentrations of 100 mg/L differed by 8.4% from
control. The respiration rate of the activated sludge to
Dicyclohexylphthalate at the rate of 100 mg/L was not statistically
significant reduced when compared to the control (Student ttest for
homogenous variances with Bonferroni-Holm Adjustment, α=0.05).
The NOEC is established above 100 mg/L.
The positive control 3,5-Dichlorophenol
was tested in the same way as the test item. The 3-hour EC50 was found
to be 4.7 mg/L thus laying in the range of 2 - 25 mg/L recommended by
the test guidelines. The result confirms the suitability of the
activated sludge used.
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