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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:
calculation (if not (Q)SAR)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Justification for type of information:
Data is from computational model developed by USEPA
Qualifier:
according to guideline
Guideline:
other: Modeling database
Principles of method if other than guideline:
The Biodegradation Probability Program (BIOWIN) estimates the probability for the rapid aerobic biodegradation of an organic chemical in the presence of mixed populations of environmental microorganisms .The model is part of the EpiSuite program of the US-EPA. Estimations are made with BIOWIN version 4.10. Estimates are based upon fragment constants that were developed using multiple linear and non-linear regression analyses. Experimental biodegradation data for the multiple linear and non-linear regressions were obtained from Syracuse Research Corporation's (SRC) data base of evaluated biodegradation data (Howard et. al., 1987). This version (v4.10) designates the models as follows (see also Boethling et al. 2003):
Biowin1 = linear probability model
Biowin2 = nonlinear probability model
Biowin3 = expert survey ultimate biodegradation model
Biowin4 = expert survey primary biodegradation model
Biowin5 = MITI linear model
Biowin6 = MITI nonlinear model
Biowin7 = anaerobic biodegradation model
GLP compliance:
no
Oxygen conditions:
other: aerobic (Biowin 1-6) and anaerobic (Biowin 7)
Inoculum or test system:
other: mixed populations of environmental microorganisms
Duration of test (contact time):
1.824 mo
Details on study design:
Using the computer tool BIOWIN v4.10 by US-EPA (EPIWIN) the aerobic as well as the anaerobic biodegradability of the test material can be estimated. The follwoing seven different models are used by the tool: Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI LInear Model, MITI Non-Linear Model and Anaerobic Model (calles Biowin 1-7, respectively). Due to this results the overall prediction of readily biodegradability is done for the desired chemical.

Biowin 1 and 2, are intended to convey a general indication of biodegradability under aerobic conditions, and not for any particular medium.
Biowin 1 (Linear model)
The fast biodegradation probability for any compound is calculated by summing, for all the fragments present in that compound, the fragment coefficient multiplied by the number of instances of the fragment in the compound (for MW, the value of that parameter is multiplied by its coefficient), and then adding this summation to the equation constant which is 0.7475. The summed values for each fragment coefficient multiplied by the number of instances appear in the "VALUE" column of the linear results screen.

Biowin 2 (Non-linear model)
Calculation of the fast biodegradation probability for any compound begins by summing, for all the fragments present in that compound, the fragment coefficient multiplied by the number of instances of the fragment in the compound (for MW, the value of that parameter is multiplied by its coefficient), then adding this summation to the equation constant which is 3.0087. The summed values for each fragment coefficient multiplied by the number of instances appear in the "VALUE" column of the non-linear results screen. The non-linear fast biodegradation probability is then calculated from the logistic equation as follows, where total = 3.0087 + the summation as described above:

Biowin 3 and 4 yield estimates for the time required to achieve complete ultimate and primary biodegradation in a typical or "evaluative" aquatic environment.

Biowin 5 and 6 are predictive models for assessing a compound’s biodegradability in the Japanese MITI (Ministry of International Trade and Industry) ready biodegradation test; i.e. OECD 301C. These models use an approach similar to that used to develop Biowin1 and 2. This protocol for determining ready biodegradability is among six officially approved as ready biodegradability test guidelines of the OECD (Organization for Economic Cooperation and Development). A total dataset of 884 chemicals was compiled to derive the fragment probability values that are applied in this MITI Biodegradability method. The dataset consists of 385 chemical that were critically evaluated as "readily degradable" and 499 chemicals that were critically evaluated as "not readily biodegradable".

Biowin 7, the anaerobic biodegradation model, is the most recent. As for the other Biowin models, multiple (linear) regression against molecular fragments was used to develop the model, which predicts probability of rapid degradation in the "serum bottle" anaerobic biodegradation screening test. This endpoint is assumed to be predictive of degradation in a typical anaerobic digester. Biowin7 estimates the probability of fast biodegradation under methanogenic anaerobic conditions; specifically, under the conditions of the "serum bottle" anaerobic biodegradation screening test (Meylan et al. 2007). A total of 169 compounds with serum bottle test data were identified for use in model development.

Out of seven different Biowin models, Biowin model 3 and 4 will help in estimating biodgeradability of the test chemical which was described as below-

Ultimate Biodegradation Timeframe and Primary Biodegradation Timeframe (Biowin 3 and 4)
These two models estimate the time required for "complete" ultimate and primary biodegradation.  Primary biodegradation is the transformation of a parent compound to an initial metabolite.  Ultimate biodegradation is the transformation of a parent compound to carbon dioxide and water, mineral oxides of any other elements present in the test compound, and new cell material. Then the rating was given to each model, which indicates the time required to achieve ultimate and primary biodegradation in a typical or "evaluative" aquatic environment. The ratings for each compound were averaged to obtain a single value for modeling.  The ultimate or primary rating of a compound is calculated by summing, for all the fragments present in that compound.
Key result
Parameter:
other: Half-life
Value:
50
Sampling time:
1.824 mo
Remarks on result:
other: not readily biodegradable as estimated by BIOWIN model
Details on results:
Biowin1 (Linear Model Prediction) : 1.0893: Biodegrades Fast
Biowin2 (Non-Linear Model Prediction): 0.0663: Does Not Biodegrade Fast
Biowin3 (Ultimate Biodegradation Timeframe): 1.8241: Months
Biowin4 (Primary Biodegradation Timeframe): 3.1666: Weeks
Biowin5 (MITI Linear Model Prediction) : 0.1582: Does Not Biodegrade Fast
Biowin6 (MITI Non-Linear Model Prediction): 0.0000: Does Not Biodegrade Fast
Biowin7 (Anaerobic Model Prediction): -1.5448: Does Not Biodegrade Fast
Ready Biodegradability Prediction: NO

BIOWIN (v4.10) Program Results:

==============================

SMILES : Oc1c(cccc1c2nc(nc(n2)c3ccc(cc3C)C)c4c(cc(cc4)C)C)OCCCCCCCC

CHEM : Phenol, 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-(octylox

y)-

MOL FOR: C33 H39 N3 O2

MOL WT : 509.70

--------------------------- BIOWIN v4.10 Results ----------------------------

Biowin1 (Linear Model Prediction) : Biodegrades Fast

Biowin2 (Non-Linear Model Prediction): Does Not Biodegrade Fast

Biowin3 (Ultimate Biodegradation Timeframe): Months

Biowin4 (Primary Biodegradation Timeframe): Weeks

Biowin5 (MITI Linear Model Prediction) : Does Not Biodegrade Fast

Biowin6 (MITI Non-Linear Model Prediction): Does Not Biodegrade Fast

Biowin7 (Anaerobic Model Prediction): Does Not Biodegrade Fast

Ready Biodegradability Prediction: NO

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin1 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 1 | Linear C4 terminal chain [CCC-CH3] | 0.1084 | 0.1084

Frag | 1 | Aromatic alcohol [-OH] | 0.1158 | 0.1158

Frag | 1 | Triazine ring (symmetric) | 0.0095 | 0.0095

Frag | 1 | Aromatic ether [-O-aromatic carbon] | 0.1319 | 0.1319

Frag | 4 | Alkyl substituent on aromatic ring | 0.0547 | 0.2187

MolWt| * | Molecular Weight Parameter | | -0.2427

Const| * | Equation Constant | | 0.7475

============+============================================+=========+=========

RESULT | Biowin1 (Linear Biodeg Probability) | | 1.0893

============+============================================+=========+=========

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin2 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 1 | Linear C4 terminal chain [CCC-CH3] | 1.8437 | 1.8437

Frag | 1 | Aromatic alcohol [-OH] | 0.9086 | 0.9086

Frag | 1 | Triazine ring (symmetric) | -5.7252 | -5.7252

Frag | 1 | Aromatic ether [-O-aromatic carbon] | 2.2483 | 2.2483

Frag | 4 | Alkyl substituent on aromatic ring | 0.5771 | 2.3084

MolWt| * | Molecular Weight Parameter | | -7.2377

============+============================================+=========+=========

RESULT | Biowin2 (Non-Linear Biodeg Probability) | | 0.0663

============+============================================+=========+=========

A Probability Greater Than or Equal to 0.5 indicates --> Biodegrades Fast

A Probability Less Than 0.5 indicates --> Does NOT Biodegrade Fast

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin3 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 1 | Linear C4 terminal chain [CCC-CH3] | 0.2983 | 0.2983

Frag | 1 | Aromatic alcohol [-OH] | 0.0564 | 0.0564

Frag | 1 | Triazine ring (symmetric) | -0.2459 | -0.2459

Frag | 1 | Aromatic ether [-O-aromatic carbon] | -0.0581 | -0.0581

Frag | 4 | Alkyl substituent on aromatic ring | -0.0749 | -0.2994

MolWt| * | Molecular Weight Parameter | | -1.1264

Const| * | Equation Constant | | 3.1992

============+============================================+=========+=========

RESULT | Biowin3 (Survey Model - Ultimate Biodeg) | | 1.8241

============+============================================+=========+=========

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin4 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 1 | Linear C4 terminal chain [CCC-CH3] | 0.2691 | 0.2691

Frag | 1 | Aromatic alcohol [-OH] | 0.0397 | 0.0397

Frag | 1 | Triazine ring (symmetric) | -0.0575 | -0.0575

Frag | 1 | Aromatic ether [-O-aromatic carbon] | 0.0771 | 0.0771

Frag | 4 | Alkyl substituent on aromatic ring | -0.0685 | -0.2741

MolWt| * | Molecular Weight Parameter | | -0.7354

Const| * | Equation Constant | | 3.8477

============+============================================+=========+=========

RESULT | Biowin4 (Survey Model - Primary Biodeg) | | 3.1666

============+============================================+=========+=========

Result Classification: 5.00 -> hours 4.00 -> days 3.00 -> weeks

(Primary & Ultimate) 2.00 -> months 1.00 -> longer

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin5 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 1 | Aromatic alcohol [-OH] | 0.0642 | 0.0642

Frag | 1 | Triazine ring (symmetric) | 0.1168 | 0.1168

Frag | 1 | Aromatic ether [-O-aromatic carbon] | 0.1952 | 0.1952

Frag | 4 | Aromatic-CH3 | 0.0415 | 0.1658

Frag | 9 | Aromatic-H | 0.0082 | 0.0740

Frag | 1 | Methyl [-CH3] | 0.0004 | 0.0004

Frag | 7 | -CH2- [linear] | 0.0494 | 0.3459

MolWt| * | Molecular Weight Parameter | | -1.5163

Const| * | Equation Constant | | 0.7121

============+============================================+=========+=========

RESULT | Biowin5 (MITI Linear Biodeg Probability) | | 0.1582

============+============================================+=========+=========

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin6 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 1 | Aromatic alcohol [-OH] | 0.4884 | 0.4884

Frag | 1 | Triazine ring (symmetric) | -9.3006 | -9.3006

Frag | 1 | Aromatic ether [-O-aromatic carbon] | 1.3227 | 1.3227

Frag | 4 | Aromatic-CH3 | 0.3072 | 1.2288

Frag | 9 | Aromatic-H | 0.1201 | 1.0813

Frag | 1 | Methyl [-CH3] | 0.0194 | 0.0194

Frag | 7 | -CH2- [linear] | 0.4295 | 3.0065

MolWt| * | Molecular Weight Parameter | |-14.7143

============+============================================+=========+=========

RESULT |Biowin6 (MITI Non-Linear Biodeg Probability)| | 0.0000

============+============================================+=========+=========

A Probability Greater Than or Equal to 0.5 indicates --> Readily Degradable

A Probability Less Than 0.5 indicates --> NOT Readily Degradable

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin7 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 1 | Linear C4 terminal chain [CCC-CH3] | -0.3177 | -0.3177

Frag | 1 | Aromatic alcohol [-OH] | 0.0807 | 0.0807

Frag | 1 | Triazine ring (symmetric) | -0.0783 | -0.0783

Frag | 1 | Aromatic ether [-O-aromatic carbon] | 0.1780 | 0.1780

Frag | 4 | Alkyl substituent on aromatic ring | -0.1145 | -0.4578

Frag | 4 | Aromatic-CH3 | -0.2573 | -1.0293

Frag | 9 | Aromatic-H | -0.0954 | -0.8589

Frag | 1 | Methyl [-CH3] | -0.0796 | -0.0796

Frag | 7 | -CH2- [linear] | 0.0260 | 0.1819

Const| * | Equation Constant | | 0.8361

============+============================================+=========+=========

RESULT | Biowin7 (Anaerobic Linear Biodeg Prob) | | -1.5448

============+============================================+=========+=========

A Probability Greater Than or Equal to 0.5 indicates --> Biodegrades Fast

A Probability Less Than 0.5 indicates --> Does NOT Biodegrade Fast

Ready Biodegradability Prediction: (YES or NO)

----------------------------------------------

Criteria for the YES or NO prediction: If the Biowin3 (ultimate survey

model) result is "weeks" or faster (i.e. "days", "days to weeks", or

"weeks" AND the Biowin5 (MITI linear model) probability is >= 0.5, then

the prediction is YES (readily biodegradable). If this condition is not

satisfied, the prediction is NO (not readily biodegradable). This method

is based on application of Bayesian analysis to ready biodegradation data

(see Help). Biowin5 and 6 also predict ready biodegradability, but for

degradation in the OECD301C test only; using data from the Chemicals

Evaluation and Research Institute Japan (CERIJ) database.

Validity criteria fulfilled:
not specified
Interpretation of results:
not readily biodegradable
Conclusions:
The biodegradability of the substance was calculated using seven different Biowin 1-7 models of the BIOWIN v4.10 software. The results indicate that the test chemical is expected to be not readily biodegradable.
Executive summary:

Estimation Programs Interface Suite was run to predict the biodegradation potential of the test chemical in the presence of mixed populations of environmental microorganisms. The biodegradability of the substance was calculated using seven different models such as Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI Linear Model, MITI Non-Linear Model and Anaerobic Model (called as Biowin 1-7, respectively) of the BIOWIN v4.10 software. The results indicate that test chemical is expected to be not readily biodegradable.

Description of key information

Estimation Programs Interface Suite was run to predict the biodegradation potential of the test chemical in the presence of mixed populations of environmental microorganisms. The biodegradability of the substance was calculated using seven different models such as Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI Linear Model, MITI Non-Linear Model and Anaerobic Model (called as Biowin 1-7, respectively) of the BIOWIN v4.10 software. The results indicate that test chemical is expected to be not readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
not biodegradable

Additional information

Predicted data for the test chemical and experimental studies for its read across substance were reviewed for the biodegradation end point and their results are summarized as below:

 

In the first study the Estimation Programs Interface Suite was run to predict the biodegradation potential of the test chemical in the presence of mixed populations of environmental microorganisms. The biodegradability of the substance was calculated using seven different models such as Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI Linear Model, MITI Non-Linear Model and Anaerobic Model (called as Biowin 1-7, respectively) of the BIOWIN v4.10 software. The results indicate that the chemical is expected to be not readily biodegradable.

 

In a supporting weight of evidence study from secondary sources, biodegradation study was conducted for assessing the effect of test chemical. The study was performed in accordance with the OECD TG 301 B at a temperature of 22 ± 2°C. Anaerobic bacteria collected from activated sludge of the sewage treatment plant was used as a test inoculum. Test chemical conc. used for the study was 10.7 mg/l and 20.2 mg/l, respectively. Aniline (20 mg/l) was used as a reference substance during the study. Reference substance aniline undergoes 84.3% degradation after 28 days. The percentage degradation of test chemical (at 10.7 and 20.2 mg/l conc.) was determined to be 6% and 5% by CO2 evolution parameter, respectively. Thus, based on percentage degradation, test chemical was considered to be not readily biodegradable.

 

For the test chemical, biodegradation study was conducted for assessing the effect of test chemical (J-CHECK, 2021). Activated sludge was used as a test inoculum. Concentration of inoculum i.e, sludge used was 30 mg/l and initial test substance conc. used in the study was 100 mg/l, respectively. The percentage degradation of test chemical was determined to be 0% and 4% by oxygen consumption and HPLC parameter, respectively. Thus, based on percentage degradation, test chemical was considered to be not readily biodegradable.

 

On the basis of above results for test chemical, it is concluded that the test chemical is expected to be not readily biodegradable in nature.