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EC number: 260-370-6 | CAS number: 56765-79-8
Endpoint summary
Administrative data
Description of key information
Biodegradation in water
Biodegradability of 4-aminobenzene-1,2-dicarbonitrile (CAS no. 56765 -79 -8) is predicted using QSAR toolbox version 3.3 (2017) with logKow as the primary descriptor. Test substance undergoes 6.36% degradation by BOD in 28 days. Thus, based on percentage degradation, the test chemical 4-aminobenzene-1,2-dicarbonitrile was estimated to be not readily biodegradable in water.
Biodegradation in water and sediment
Estimation Programs Interface (EPI Suite, 2017) prediction model was run to predict the half-life in water and sediment for the test compound 4-aminobenzene-1,2-dicarbonitrile
(CAS No. 56765 -79 -8). If released in to the environment, 25.3% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of 4-aminobenzene-1,2-dicarbonitrile in water is estimated to be 37.5 days (900 hrs). The half-life (37.5 days estimated by EPI suite) indicates that the chemical is not persistent in water and the exposure risk to aquatic animals is moderate to low whereas the half-life period of 4-aminobenzene-1,2-dicarbonitrile in sediment is estimated to be 337.5 days (8100 hrs). However, as the percentage release of test chemical into the sediment is less than 1% (i.e, reported as 0.0856%), indicates that 4-aminobenzene-1,2-dicarbonitrile is not persistent in sediment.
Biodegradation in soil
The half-life period of 4-aminobenzene-1,2-dicarbonitrile (CAS No. 56765 -79 -8) in soil was estimated using Level III Fugacity Model by EPI Suite version 4.1 estimation database (EPI suite, 2017). If released into the environment, 74.6% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of 4-aminobenzene-1,2-dicarbonitrile in soil is estimated to be 75 days (1800 hrs). Based on this half-life value of 4-aminobenzene-1,2-dicarbonitrile, it is concluded that the chemical is not persistent in the soil environment and the exposure risk to soil dwelling animals is moderate to low.
Additional information
Biodegradation in water
Various predicted data for the target compound 4-aminobenzene-1,2-dicarbonitrile (CAS No. 56765-79-8) and supporting weight of evidence studies for its read across substance were reviewed for the biodegradation end point which are summarized as below:
In a prediction done by SSS (2017) using OECD QSAR toolbox version 3.3 with logKow as the primary descriptor, percentage biodegradability of test chemical4-aminobenzene-1,2-dicarbonitrile(CAS No. 56765-79-8) was estimated.Test substance undergoes 6.36% degradation by BOD in 28 days. Thus, based on percentage degradation, the test chemical4-aminobenzene-1,2-dicarbonitrilewas estimated to be not readily biodegradable in water.
In another prediction using the Estimation Programs Interface Suite (EPI suite, 2017), the biodegradation potential of the test compound4-aminobenzene-1,2-dicarbonitrile(CAS No. 56765-79-8) 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 chemical4-aminobenzene-1,2-dicarbonitrileis expected to be not readily biodegradable.
In a supporting weight of evidence study from authoritative database (J-CHECK, SRC PhysProp database, 2017 and EnviChem, 2014) for the read across chemical 1,2-Dicyanobenzene (CAS no. 91-15-6),biodegradation experiment was conducted for 14 days for evaluating the percentage biodegradability of read across substance 1,2-Dicyanobenzene. The study was performed according to OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I)) under aerobic conditions at a temperature of 25°C and pH 7.0, respectively. 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 1,2-Dicyanobenzene was determined to be3.3 and < 0% by BOD, O2 consumption, Test mat. analysis and GC parameter in 14 days. Thus, based on percentage degradation,1,2-Dicyanobenzene is considered to be not readily biodegradable in nature.
For the read across chemical 1-hydroxy-3-amino-benzene (CAS no. 591-27-5) from peer reviewed journal (P. Gerike and W. K. Fischer, 1981),biodegradation study was conducted for 42 days for evaluating the percentage biodegradability of read across substance 1-hydroxy-3-amino-benzene. The study was performed according to other guideline “AFNOR T 90-302 Test”. The percentage degradation of substance 1-hydroxy-3-amino-benzene was determined to be 13 and 22% degradation by DOC removal parameter after 28 and 42 days. Thus, based on percentage degradation,1-hydroxy-3-amino-benzene is considered to be not readily biodegradable in nature.
Another biodegradation study was conducted for 30 days for evaluating the percentage biodegradability of the sane read across substance 1-hydroxy-3-amino-benzene (CAS no. 591-27-5) (P. Gerike and W. K. Fischer, 1981). The study was performed according to OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test).The percentage degradation of substance 1-hydroxy-3-amino-benzene was determined to be 1% by BOD parameter after 30 days. Thus, based on percentage degradation, 1-hydroxy-3-amino-benzene is considered to be not readily biodegradable in nature.
In a supporting weight of evidence study from authoritative database (J-CHECK, HSDB, 2017 and EnviChem, 2014) for the read across chemical 3,4-dimethylaniline (CAS no. 95-64-7),biodegradation experiment was conducted for 28 days for evaluating the percentage biodegradability of read across substance 3,4-dimethylaniline. The study was performed according to OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I)). Concentration of inoculum i.e, sludge used was 100 mg/l and initial test substance conc. used in the study was 30 mg/l, respectively. The percentage degradation of substance 3,4-dimethylaniline was determined to be 7.1 and 4.8% by BOD and GC parameter in 28 days. Thus, based on percentage degradation, 3,4 -dimethylaniline is considered to be not readily biodegradable in nature.
On the basis of above results for target chemical 4-aminobenzene-1,2-dicarbonitrile (from OECD QSAR toolbox version 3.3 and EPI suite, 2017) and for its read across substance (from authoritative database J-CHECK, SRC PhysProp database, HSDB & EnviChem and peer reviewed journal), it can be concluded that the test substance 4-aminobenzene-1,2-dicarbonitrile can be expected to be not readily biodegradable in nature.
Biodegradation in water and sediment
Estimation Programs Interface (EPI Suite, 2017) prediction model was run to predict the half-life in water and sediment for the test compound 4-aminobenzene-1,2-dicarbonitrile
(CAS No. 56765 -79 -8). If released in to the environment, 25.3% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of 4-aminobenzene-1,2-dicarbonitrile in water is estimated to be 37.5 days (900 hrs). The half-life (37.5 days estimated by EPI suite) indicates that the chemical is not persistent in water and the exposure risk to aquatic animals is moderate to low whereas the half-life period of 4-aminobenzene-1,2-dicarbonitrile in sediment is estimated to be 337.5 days (8100 hrs). However, as the percentage release of test chemical into the sediment is less than 1% (i.e, reported as 0.0856%), indicates that 4-aminobenzene-1,2-dicarbonitrile is not persistent in sediment.
Biodegradation in soil
The half-life period of 4-aminobenzene-1,2-dicarbonitrile (CAS No. 56765 -79 -8) in soil was estimated using Level III Fugacity Model by EPI Suite version 4.1 estimation database (EPI suite, 2017). If released into the environment, 74.6% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of 4-aminobenzene-1,2-dicarbonitrile in soil is estimated to be 75 days (1800 hrs). Based on this half-life value of 4-aminobenzene-1,2-dicarbonitrile, it is concluded that the chemical is not persistent in the soil environment and the exposure risk to soil dwelling animals is moderate to low.
On the basis of available information, the test substance 4-aminobenzene-1,2-dicarbonitrile can be considered to be not readily biodegradable in nature.
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