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EC number: 219-784-2
CAS number: 2530-83-8
Table 1: Results of the activated
sludge respiration inhibition test
Loading rate (mg/l)
Oxygen conc. At start (mg O2/l)
Oxygen consumption (mg O2/l/h)
Toxicity to microorganisms: ASRI 3
hour EC50 >100 mg/l (loading rate) (OECD 209). This was a
limit test, but the very low inhibition seen indicates that the EC10
can be taken to be =100 mg/l.
A 3 hour activated sludge
respiration inhibition EC10 value of >100 mg/l (loading rate)
was determined in a reliable study conducted according to an appropriate
test protocol, and in compliance with GLP. This indicates that the test
substance was not toxic to waste water (activated sludge) bacteria at a
loading rate of 100 mg/l.
An EC10 of 1520 mg/l
for toxicity to microorganisms (Pseudomonas putida) was
determined in a reliability 2 study (reliable with restrictions)
conducted according to generally accepted scientific principles and in
compliance with GLP (Schoberl, 1993). The restrictions were that
nonylphenol ethoxylate propoxylate (EO 10 Mol and PO 5 Mol) was used as
a solubilising agent, which could potentially have affected the results,
and in addition, no reference substance was used to check the activity
of the inoculum. This study is selected as supporting study.
An IC50 >2500 mg/l is
reported in secondary literature (handbook, Chandra 1997). The original
reference was not available for review and no further information is
available. The reliability of this data cannot be assigned.
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