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EC number: 284-366-9
CAS number: 84852-53-9
Respiration Rate (mg O2/L/h)
(3, 15, 50 mg/kg)
32.4, 18.9, 6.1
-1.9, 40.6, 80.8
The effect of DBDPEthane on activated sludge
microorganisms maintained in an aerobic environment was assessed. The
study contained control and reference groups and a treatment vessel. The
control replicates were used to determine the background respiration
rate of the sludge and were not dosed with the test or reference
substance. The reference group was dosed with 3,5 -dichlorophenol, a
known inhibitor of respiration, at concentrations of 3, 15 and 50 mg/L.
The treatment vessel was dosed with DBDPEthane at a concentration of 10
mg/L. After an exposure period of 3 hr, the respiration rates of the
test solutions were measured using a YSI Model 50 B Dissolved Oxyegen
Meter. The respiration rates in the two controls were 32.3 and 31.3 mg
O2/L/hr. The difference between the two control respriation rates was
approximately 3% and was within the 15% difference limit established for
the test. The validity of the test was further supporte by the results
from the 3,5 -dichlorophenol reference group, which resulted in an EC50
of 19.4 mg/L with 95 % confidence limits of 3 and 50. The EC50 for the
reference substance was within the 5 to 30 mg/L range considered
acceptable for the test. The % respiration inhibition observed for DBDPEthane
at 10 mg/L was -5.3%. Under the conditions of the study, DBDPEthane did
not adversely affect sludge respriation.
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