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EC number: 417-790-1
CAS number: 78418-01-6
Table 1: Influence of Mexoryl SAB and
3,5-dichlorophenol on the oxygen consumption of activated sludge
Nominal concentration of test chemical (mg/L)
Oxygen consumption rate (mg O2/L/min)
Oxygen concentration (mg O2/L)
The inhibitory effect of the test item on
the respiration rate of aerobic wastewater microorganisms of activated
sludge was investigated in a 3 -hour respiration inhibition test
according to the EU commission directive 88/302/EEC, Part C.11,
commission regulation (EC) No. 440/2008, Part C.11 and the OECD
guideline for testing of chemicals, No. 209.
The following nominal concentrations of test
item were tested: 10, 32, 100, 320, and 1000 mg/L.
In addition, 2 controls and 3 different
concentrations of the reference item 3,5 -dichlorophenol (5, 16, and 50
mg/L) were tested in parallel. The results of these treatments confirmed
suitability of the activated sludge and the method used.
Up to and including the test item
concentration 100 mg/L, the test item had no significant inhibitory
effect (=< 10%) on the respiration rate of activated sludge after the
incubation period of 3 hours. At the higher test item concentrations of
320 and 1000 mg/L, the inhibitory effects were 35 and 91%, respectively.
The calculated 3 -hour EC values were
determined as follows:
NOEC: 179 mg/L 95% confidence limits: 161
EC20: 238 mg/L 95% confidence limits: 221
EC50: 413 mg/L 95% confidence limits: 394
EC80: 716 mg/L 95% confidence limits: 663
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