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Diss Factsheets

Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The test substance is not readily biodegradable according to OECD criteria.

Key value for chemical safety assessment

Additional information

A test on the ready biodegradability of the actual test item is not available. However, data on a structural analogue (CAS 91081-53-7) are availble.The structutal analogue (Rosin, reaction products with formaldehyde) is the acid of the calcium salt . For read-across justification see Annex.

The biodegradability of the test substance was tested in an OECD 301 B study (SafePharm Laboratories Ltd. 1993). After 28 days 0 % (10 mg/L test concentration) and 4% (20 mg/L test concentration) biodegradation has been observed. Therefore, the test substance is not readily biodegradable according to OECD criteria. To support the results of the read-across substance QSAR calculations were conducted using CATALOGIC v5.11.5 (BASF SE 2012). The CATALOGIC BOD 28 days MITI (OECD 301C) v.06.07 was calculated for the main components of the UVCB substance. 0.7 - 2.9 % biodegration has been calculated. Even though the main components were out of the structural domain (at minimum 52.17 % correct and 47.83 % unknown) the results can be used in a weight of evidence and represent a worst case assumption. EPISuite calculations using BIOWIN v4.10 suggest also no ready biodegradability for all main compounds. Therefore, the QSAR calculations confirm the results of the ready biodegradation study of the analogues substance and the test substance is not readily biodegradable according to OECD criteria.