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EC number: 306-060-7 | CAS number: 95873-69-1
The test item Sodium [(6-hydroxy-4-methyl-2-oxo-2H-1-benzopyran-7-yl)oxy]acetate was investigated for its ready biodegradability in a Closed Bottle 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 test system was a microbial inoculum of good quality, collected from a sewage plant for domestic sewage. The sludge was allowed to settle and then aerated until use.
The reference item Sodium benzoate was sufficiently degraded to a mean of 76.7 % after 14 days, and to a mean of 81.7 % after 28 days of incubation, based on ThOD, thus confirming the suitability of the used inoculum.
In the toxicity control containing both, the test item and the reference item Sodium benzoate, a mean of 41.4 % biodegradation was noted within 14 days and 43.5 % biodegradation after 28 days of incubation.
According to the test guidelines the test item can be assumed to be not inhibitory at the applied concentration level of4.4 mg/Lon the secondary effluent microorganisms because degradation was >25 % within 14 days.
The study met the validity criteria. The test item was not considered to have significant inhibitory effects on the secondary effluent microorganisms.Based on the results of this study, the test item is considered not readily biodegradable.
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