Registration Dossier

Environmental fate & pathways

Biodegradation in water: screening tests

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
biodegradation in water: screening tests
Type of information:
(Q)SAR
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification
Justification for type of information:
The supporting QMRF report has been attached
Qualifier:
according to
Guideline:
OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))
Principles of method if other than guideline:
The data is predicted using the OECD QSAR toolbox version 3.3 with logKow as the primary descriptor.
GLP compliance:
not specified
Specific details on test material used for the study:
- Name of test material (IUPAC name): Anisoyl chloride
- Common name: 4-Methoxybenzoyl Chloride
- Molecular formula: C8H7ClO2
- Molecular weight: 170.5943 g/mol
- Smiles notation: c1(ccc(cc1)OC)C(=O)Cl
- InChl: 1S/C8H7ClO2/c1-11-7-4-2-6(3-5-7)8(9)10/h2-5H,1H3
- Substance type: Organic
- Physical state: Liquid
Oxygen conditions:
aerobic
Inoculum or test system:
other: Micro-organisms
Duration of test (contact time):
28 d
Based on:
not specified
Parameter followed for biodegradation estimation:
other: BOD
Key result
Parameter:
other: BOD
Value:
1.182
Sampling time:
28 d
Remarks on result:
other: Other details not known
Details on results:
Test substance undergoes 1.18% degradation by BOD in 28 days.

The prediction was based on dataset comprised from the following descriptors: BOD
Estimation method: Takes average value from the 8 nearest neighbours
Domain  logical expression:Result: In Domain

((((((((((("a" or "b" or "c" or "d" )  and "e" )  and "f" )  and ("g" and ( not "h") )  )  and "i" )  and "j" )  and "k" )  and "l" )  and ("m" and ( not "n") )  )  and "o" )  and ("p" and "q" )  )

Domain logical expression index: "a"

Referential boundary: The target chemical should be classified as Acyl chloride OR Acyl halide OR Alkylarylether OR Aromatic compound OR Carbonic acid derivative OR Carboxylic acid derivative OR Ether OR Halogen derivative by Organic functional groups, Norbert Haider (checkmol) ONLY

Domain logical expression index: "b"

Referential boundary: The target chemical should be classified as Aliphatic Carbon [CH] OR Aliphatic Carbon [-CH2-] OR Aliphatic Carbon [-CH3] OR Aromatic Carbon [C] OR Carbonyl, olefinic attach [-C(=O)-] OR Carbonyl, one aromatic attach [-C(=O)-] OR Chlorine, olefinic attach [-Cl] OR Miscellaneous sulfide (=S) or oxide (=O) OR Olefinic carbon [=CH- or =C<] OR Oxygen, one aromatic attach [-O-] by Organic functional groups (US EPA) ONLY

Domain logical expression index: "c"

Referential boundary: The target chemical should be classified as Acyl halide OR Aryl OR Ether OR Overlapping groups by Organic Functional groups (nested) ONLY

Domain logical expression index: "d"

Referential boundary: The target chemical should be classified as Acyl halide OR Aryl OR Ether by Organic Functional groups ONLY

Domain logical expression index: "e"

Referential boundary: The target chemical should be classified as Reactive unspecified by Acute aquatic toxicity MOA by OASIS ONLY

Domain logical expression index: "f"

Referential boundary: The target chemical should be classified as Fast by Bioaccumulation - metabolism half-lives ONLY

Domain logical expression index: "g"

Referential boundary: The target chemical should be classified as Halogens AND Non-Metals by Groups of elements

Domain logical expression index: "h"

Referential boundary: The target chemical should be classified as Alkali Earth OR Metalloids OR Metals OR Transition Metals by Groups of elements

Domain logical expression index: "i"

Referential boundary: The target chemical should be classified as Aliphatic Carbon [CH] AND Aliphatic Carbon [-CH2-] AND Aliphatic Carbon [-CH3] AND Aromatic Carbon [C] AND Carbonyl, olefinic attach [-C(=O)-] AND Carbonyl, one aromatic attach [-C(=O)-] AND Chlorine, olefinic attach [-Cl] AND Miscellaneous sulfide (=S) or oxide (=O) AND Olefinic carbon [=CH- or =C<] AND Oxygen, one aromatic attach [-O-] by Organic functional groups (US EPA) ONLY

Domain logical expression index: "j"

Referential boundary: The target chemical should be classified as Aliphatic Carbon [CH] AND Aliphatic Carbon [-CH2-] AND Aliphatic Carbon [-CH3] AND Aromatic Carbon [C] AND Carbonyl, olefinic attach [-C(=O)-] AND Carbonyl, one aromatic attach [-C(=O)-] AND Chlorine, olefinic attach [-Cl] AND Miscellaneous sulfide (=S) or oxide (=O) AND Olefinic carbon [=CH- or =C<] AND Oxygen, one aromatic attach [-O-] by Organic functional groups (US EPA) ONLY

Domain logical expression index: "k"

Referential boundary: The target chemical should be classified as days - weeks by Biodeg primary (Biowin 4) ONLY

Domain logical expression index: "l"

Referential boundary: The target chemical should be classified as Does NOT Biodegrade Fast by Biodeg probability (Biowin 5) ONLY

Domain logical expression index: "m"

Referential boundary: The target chemical should be classified as Non binder, without OH or NH2 group by Estrogen Receptor Binding

Domain logical expression index: "n"

Referential boundary: The target chemical should be classified as Non binder, non cyclic structure by Estrogen Receptor Binding

Domain logical expression index: "o"

Referential boundary: The target chemical should be classified as Not calculated by Hydrolysis half-life (Kb, pH 7)(Hydrowin) ONLY

Domain logical expression index: "p"

Parametric boundary:The target chemical should have a value of Molecular weight which is >= 105 Da

Domain logical expression index: "q"

Parametric boundary:The target chemical should have a value of Molecular weight which is <= 227 Da

Validity criteria fulfilled:
not specified
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
The test chemical Anisoyl chloride was estimated to be not readily biodegradable in water.
Executive summary:

Biodegradability of Anisoyl chloride (CAS no. 100 -07 -2) is predicted using QSAR toolbox version 3.3 with logKow as the primary descriptor. Test substance undergoes 1.18% degradation by BOD in 28 days. Thus, based on percentage degradation, the test chemical Anisoyl chloride was estimated to be not readily biodegradable in water.

Description of key information

Biodegradability of Anisoyl chloride (CAS no. 100 -07 -2) is predicted using QSAR toolbox version 3.3 (2018) with logKow as the primary descriptor. Test substance undergoes 1.18% degradation by BOD in 28 days. Thus, based on percentage degradation, the test chemical Anisoyl chloride was estimated to be not readily biodegradable in water.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

Various predicted data for the target compound Anisoyl chloride (CAS No. 100-07-2) and supporting weight of evidence studies for its structurally and functionally similar read across substance were reviewed for the biodegradation end point which are summarized as below:

 

In a prediction done by SSS (2018) using OECD QSAR toolbox version 3.3 with logKow as the primary descriptor, percentage biodegradability of test chemicalAnisoyl chloride(CAS No. 100-07-2) was estimated.Test substance undergoes 1.18% degradation by BOD in 28 days. Thus, based on percentage degradation, the test chemicalAnisoyl chloridewas estimated to be not readily biodegradable in water.

 

In another prediction using the Estimation Programs Interface Suite (EPI suite, 2018), the biodegradation potential of the test compoundAnisoyl chloride(CAS No. 100-07-2) in the presence of mixed populations of environmental microorganisms was estimated.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 chemicalAnisoyl chlorideis expected to be not readily biodegradable.

 

In a supporting weight of evidence study from authoritative database (J-CHECK, 2016 and EnviChem, 2014) for the read across chemical 1-Methoxynaphthalene (CAS no. 2216-69-5),biodegradation experiment was conducted for 28 days for evaluating the percentage biodegradability of read across substance 1-Methoxynaphthalene. 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 substance was determined to be 0 and 4% by BOD and HPLC parameter in 28 days. Thus, based on percentage degradation, 1-Methoxynaphthalene is considered to be not readily biodegradable in nature.

 

For the read across chemical 2-Chloro-1,4-dimethoxybenzene (CAS no. 2100-42-7), biodegradation study was conducted for 28 days for evaluating the percentage biodegradability of read across substance 2-Chloro-1,4-dimethoxybenzene (J-CHECK, 2016). 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 substance was determined to be 0% by BOD and HPLC parameter in 28 days. Thus, based on percentage degradation, 2-Chloro-1,4-dimethoxybenzene is considered to be not readily biodegradable in nature.

 

On the basis of above results for target chemical Anisoyl chloride (from OECD QSAR toolbox version 3.3 and EPI suite, 2018) and for its read across substance (from authoritative database J-CHECK and Envichem), it can be concluded that the test substance Anisoyl chloride can be expected to be not readily biodegradable in nature.