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Environmental fate & pathways

Biodegradation in water: screening tests

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Reference
Endpoint:
biodegradation in water: ready biodegradability
Type of information:
(Q)SAR
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a (Q)SAR model, with limited documentation / justification, but validity of model and reliability of prediction considered adequate based on a generally acknowledged source
Reference:
Composition 0
Guideline:
other: REACH Guidance on QSARs R.6, 2008
Principles of method if other than guideline:
BIOWIN v.4.10 (EPISuite) for Biodegradation
GLP compliance:
no
Test material information:
Composition 1
Specific details on test material used for the study:
SMILES code: C(=O)(O)c1cc(C(=O)O)cc(N(=O)=O)c1
Key result
Parameter:
probability of ready biodegradability (QSAR/QSPR)
Remarks on result:
not readily biodegradable based on QSAR/QSPR prediction

Biowin1 (Linear Model Prediction): Biodegrades Fast

Biowin2 (Non-Linear Model Prediction): Biodegrades Fast

Biowin3 (Ultimate Biodegradation Timeframe): Weeks-Months

Biowin4 (Primary Biodegradation Timeframe): Days-Weeks

Biowin5 (MITI Linear Model Prediction): Readily Degradable

Biowin6 (MITI Non-Linear Model Prediction): Not Readily Degradable

Biowin7 (Anaerobic Model Prediction): Biodegrades Fast

Ready Biodegradability Prediction: NO

Interpretation of results:
not readily biodegradable
Conclusions:
Based on the model outcome of BIOWIN v.4.10, 5-nitroisophthalica acid may not be considered as readily biodegradable. 5-nitroisophthalica acid is within the applicability domain of “BIOWIN v.4.10”. Results of the different prediction models are however somewhat contradictory. In sum, the conditions for ready biodegradability are not satisfied since the Biowin5 (MITI linear model) probability is > 0.5, but the Biowin3 (ultimate survey model) result is "weeks-months". Thus, the prediction is fully reliable and addresses the information requirement of Regulation (EC) No 1907/2006 (REACH) Annex VII section 9.2.1.1.

Description of key information

Based on the QSAR prediction of BIOWIN (v 4.10), 5-nitroisophthalic acid may not be considered as ready biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information