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EC number: 431-620-3
CAS number: -
Oxygen consumption rates and percentage inhibition values in
definitive study after 30 minutes contact time
Values in  indicate an increase in respiration rate as compared to
A study was performed to assess the effect of the test material on the
respiration of activated sewage sludge. The method followed that
described in the OECD Guidelines for Testing of Chemicals (1984) No 209
"Activated Sludge Respiration Inhibition Test". EEC Commission Directive
87/302/EEC and US EPA Ecological Effects Test Guidelines OPPTS 850.6800.
Following a preliminary range-finding study, activated sewage sludge was
exposed to an aqueous solution of the test material at concentrations of
100, 180, 320, 560 and 1000 mg/l for a period of 3 hours at 21 C with
the addition of a synthetic sewage as a respiratoru substrate. The rate
of respirtion was determined after 30 minutes and 3 hours contact time
and compared to data for the control and a reference material, 3,5
The effect of the test material on the respiration of activated sewage
sludge gave a 3-hour EC50 of 740 mg/l. The No Observed Effect
Concentration (NOEC) after 3 hours exposure was 180 mg/l.
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