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Endpoint summary

Description of key information

The biodegradation of the test material was studied according to OECD Guideline 301B.

The average degree of degradation of the test item was 80% after 28 days. Accordingly, the test substance is to be defined as "readily biodegradable". The degree of degradation in the first test solution was 76%, in the second test solution a degradation rate of 85% was determined.

The included toxicity control showed no indication of an inhibitory effect. Therefore, when applying the 10-day-window, the test substance is readily biodegradable following OECD 301B.

Furthermore, the aerobic biodegradation of the test item was evaluated in a marine biodegradation test according to ASTM D6691 (2017). The test was performed in triplicate and the incubation temperature was continuously kept at 30°C ± 1°C. The total test duration was 196 days and the final biodegradation percentages are based on CO2 production.
According to the ASTM D6691 (2017) standard, the test is considered valid if the degree of biodegradation of the reference material is > 70% at the end of the test. The results show that the requirement was fulfilled. After 196 days a plateau in biodegradation was reached at a percentage of 85.0% ± 1.4%.
The test item started almost immediately to degrade and proceeded at a moderate rate throughout the test. After 42 days test item was degraded by 50.2%. The biodegradation rate gradually slowed down and at the end of the test (196 days) an absolute biodegradation of 76.3% ± 0.8%. On a relative basis, compared to suitable reference substrate cellulose, a biodegradation percentage of 89.7% was calculated. The biodegradation was still very slowly progressing.