Registration Dossier
Registration Dossier
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EC number: 239-491-3 | CAS number: 15471-17-7
Endpoint summary
Administrative data
Description of key information
Additional information
Regarding biodegradation in water (screening tests) an experimental (key study, Klimisch score 2) as well as QSAR results (supporting study, Klimisch score 2) are available for the test substance. The study was conducted according to OECD Guideline 301E (Kuhlmann, 1990). As degradation parameter the DOC removal in the samples was measured by a total organic carbon analyser according to DIN 38409 T3. After 2 weeks incubation 2 % of the test substance was degraded, after 19 days 42 %, after 27 days 85 % and at the end of the experiment (28 days) 86 % degradation had occurred. Tetrapropylbenzolsulfonat (TPBS) and Marlon A were used as reference substances. After 28 days incubation with activated sludge (adaption not further specified) these substances were degraded for 24 % and 58 %, respectively. Based on the results of the key study the substance is readily biodegradable, but fails the so-called 10 -day window defined in the guideline.
For completeness, a prediction for biodegradability of PPS was performed with the computer program BIOWIN v4.10 (EPIWIN software) by US-EPA (Chemservice S.A., 2011). This program predicts biodegradation by applying seven different models: Linear Model (Biowin 1), Non-linear Model (Biowin 2), Ultimate Biodegradation Timeframe (Biowin 3), Primary Biodegradation Timeframe (Biowin 4), MITI Linear Model (Biowin 5), MITI Non-linear Model (Biowin 6) and Anaerobic Model (Biowin 7). The overall result gives the ready biodegradability prediction of the target substance. According to Biowin 1 and 2 the substance is biodegrading fast. The Ultimate Biodegradation Timeframe is given in weeks, whereas the Primary Biodegradation Timeframe gives days-weeks as result. Both MITI Models predict that the substance is not readily biodegradable, which is also the overall prediction result. Also under anaerobic conditions the substance is expected to be not degraded fast.
In conclusion, PPS is assessed as readily biodegradable based on a valid experimental test.
As consequence, due to this conclusion, no further biodegradation tests have to be conducted in accordance with REACH Annex IX, Section 9.2.1.2. (water), Section 9.2.1.3. (soil) and Section 9.2.1.4. (sediment), respectively.
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