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EC number: 620-455-4
CAS number: 524709-74-8
The test item was investigated for its ready biodegradability in a manometric respirometry test over a period of 28 days. The biodegradation was followed by the oxygen uptake of the microorganisms during exposure. As a reference item sodium benzoate was tested simultaneously under the same conditions as the test item, and functioned as a procedure
control. The GLP study was performed according to OECD TG 301F.
Biodegradation of test item
The test item did not reach a mean biodegradation of 10% during the incubation time of 28 days. The mean biodegradation at test end after 28 days was 0% (ThOD-NH4). Therefore, the test item is considered to be not readily biodegradable based on ThOD-NH4.
Biodegradation of Sodium Benzoate
The reference item sodium benzoate was sufficiently degraded to 80% after 14 days and to 83% after 28 days of incubation, thus confirming the suitability of the aerobic activated sludge inoculum used.
Biodegradation in the Toxicity Control
In the toxicity control containing both, the test item and the reference item sodium benzoate, 31% biodegradation was noted within 14 days and 33% biodegradation after 28 days of incubation. According to the test guidelines, the test item can be assumed to be not inhibitory to the aerobic activated sludge microorganisms because degradation was >25% within 14 days.
The test item is considered to be not readily biodegradable.
OECD 301F not readily biodegradable
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