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EC number: 807-130-4
CAS number: 53716-82-8
Degradation of the Test Item:
In the test flasks, containing the
test item Cyrene™ and activated sludge (inoculum), the initial mean
concentration of dissolved organic carbon (DOC) of 28.7 mg/L on Day 0
rapidly decreased after Exposure Day 8, reaching 99% decrease of the
initial value within 14 days of exposure. The pass level for ready
biodegradability (70% removal of DOC in a 10-day window within a 28-day
period) was reached.
Degradation in the Toxicity
In the toxicity control,
containing the test item (corresponding to 50.1% of total DOC), the
reference item (corresponding to 49.9% of total DOC) and activated
sludge (inoculum), the initial DOC concentration of 58.4 mg/L measured
on Day 0 decreased to 0.5 mg/L on Day 14. Biodegradation amounted to 99%
within 14 days of exposure. Thus, according to the test guidelines, the
test item was not inhibitory to activated sludge at the tested
concentration of 50.4 mg/L because degradation was > 35% within 14 days.
Measurement of pH and
The pH measured in all flasks at
the end of exposure (Day 28) was 7.2 to 7.4. The temperature during the
test period was in the range 21-24°C.
Table: Dissolved Organic Carbon
Concentration (DOC) in the Test Flasks
* Mean values of at least
triplicate measurements per sample.
# Values corrected for the mean
Table: Percentage Biodegradation
in the Test Flasks
* Corrected for the inoculum
Table: pH Values at the Start and
at the End of the Test
Biodegradation in water
(Cyrene™/Gem Diol): 99% in 28 days (DOC removal, OECD 301A)
A biodegradation value of 99% in
28 days (DOC removal) was determined for the substance in accordance
with OECD Test Guideline 301A and in compliance with GLP. The result is
considered to be reliable. Since in aqueous media the Gem Diol
predominates, the biodegradation observed is considered to reflect that
Gem Diol is readily biodegradable.
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