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EC number: 209-608-2 | CAS number: 587-98-4
Endpoint summary
Administrative data
Description of key information
Hydrolysis:
The half-life of sodium
3-[(4-anilinophenyl)diazenyl]benzenesulfonate is estimated to be 97.22
days, indicating that it is very negligibly hydrolysable.
Biodegradation in water
In the present study, the biodegradation ofsodium 3-[(4-anilinophenyl) diazenyl] benzenesulfonateis carried out by using anaerobic (UASFB bioreactor)/aerobic (aerobic bioreactor) processes(Rais Ahmad et. al, 2010). Methanogenic granular sludge/Aerobic sludge were used as innoculum. Study period for the biodegradation is 150 days and the parameter used for the study is % Biodegradation. Two aromatic amines 4-ABS and p-ADPA are the biodegradation products of sodium 3-[(4-anilinophenyl) diazenyl] benzenesulfonate, potentially formed by the anaerobic reduction of test chemical. Further 4-ABS was biodegraded aerobically, but degradation of p-ADPA doesn’t take place. Biodegradation products were confirmed with the help of HPLC and UV spectroscopic methods. The given test chemical was considered to be not readily biodegradable under aerobic conditions but this dye readily decolorized in anaerobic conditions. As per the results obtainedsodium 3-[(4-anilinophenyl) diazenyl] benzenesulfonate shows 98% biodegradation in 150 days,which confirms the test chemical is inherently biodegradable.
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 sodium 3-[(4-anilinophenyl)diazenyl] benzenesulfonate (CAS No. 587 -98 -4). If released in to the environment, 13.8% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate in water is estimated to be 60 days (1440 hrs). The half-life (60 days estimated by EPI suite) indicates that the chemical is persistent in water and the exposure risk to aquatic animals is moderate to high whereas the half-life period of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate in sediment is estimated to be 541.66 days (13000 hrs). However, as the percentage release of test chemical into the sediment is less than 2% (i.e, reported as 1.36%), indicates that sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate is not persistent in sediment.
Biodegradation in soil
The half-life period of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate (CAS No. 587 -98 -4) 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, 84.8% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate in soil is estimated to be 120 days (2880 hrs). Based on this half-life value of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate, 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.
Bioaccumulation: aquatic/sediment
From CompTox Chemistry Dashboard using OPERA (OPEn (quantitative) structure-activity Relationship Application) V1.02 model in which calculation based on PaDEL descriptors (calculate molecular descriptors and fingerprints of chemical), the bioaccumulation i.e BCF for test substance sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate was estimated to be 8.87 dimensionless . The predicted BCF result based on the 5 OECD principles. Thus based on the result it is concluded that the test substance sodium 3-[(4-anilinophenyl)diazenyl] benzenesulfonate is non-bioaccumulative in nature.
Adsorption/desorption
The Adsorption Coefficient of test substance Sodium 3-(p-anilinophenylazo)benzenesulphonate (CAS No. 587-98-4) was determined as per the HPLC method (OECD Guideline-121). The Log Koc value was found to be 1.697 ± 0.002 at 25°C.
Additional information
Hydrolysis:
Hydrolysis of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate was predicted using OECD QSAR toolbox version 3.4 (2017). The half-life of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate is estimated to be 97.22 days. This value indicates that sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate is very negligibly hydrolysable.
Biodegradation in water
Various experimental studies for the target compound sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate (CAS No. 587-98-4) were reviewed for the biodegradation end point which are summarized as below:
In an experimental study from peer reviewed journal (Rais Ahmad et. al, 2010), the biodegradation of sodium 3-[(4-anilinophenyl) diazenyl] benzenesulfonate is carried out by using anaerobic (UASFB bioreactor)/aerobic (aerobic bioreactor) processes. Methanogenic granular sludge/Aerobic sludge were used as inoculum. Study period for the biodegradation is 150 days and the parameter used for the study is % Biodegradation. Two aromatic amines 4-ABS and p-ADPA are the biodegradation products of sodium 3-[(4-anilinophenyl) diazenyl] benzenesulfonate, potentially formed by the anaerobic reduction of test chemical. Further 4-ABS was biodegraded aerobically, but degradation of p-ADPA doesn’t take place. Biodegradation products were confirmed with the help of HPLC and UV spectroscopic methods. The given test chemical was considered to be not readily biodegradable under aerobic conditions but this dye readily decolorized in anaerobic conditions. As per the results obtained sodium 3-[(4-anilinophenyl) diazenyl] benzenesulfonate shows 98% biodegradation in 150 days, which confirms the test chemicalsodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonateis inherently biodegradable.
Another biodegradation experiment under anaerobic conditions was performed for chemical sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate at 35oC and initial concentration of chemical taken was 100mg/L for 7 days (D. Brown and B. Hamburger, 1987). By spectrophotometric analysis 97% degradation was observed in 7 days. The metabolite formed after degradation of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate are 3-aminobenzenesul phonic acid and N-phenyl- I ,4-diaminobenzene. From these metabolites 3-aminobenzenesul phonic acid was again subjected to biodegradation but aerobically and it showed more than 75 % degradation in 8 days. So it is concluded that sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate is readily biodegradable.
In a supporting study from peer reviewed journal (U. Pagga and O. Brown, 1986), the aerobic biodegradation experiment was performed for chemical sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate (CAS no.587-98-4) using activated sludge at concentration 0.5 g/L dry material as inoculums and initial concentration of chemical taken was 100mg/L for 42 days. By considering DOC removal parameter test chemical showed 11% degradation in 7 days. This percentage value is very less So it is concluded that sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate (CAS no. 587-98-4) is not readily biodegradable.
It is clear that sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate is not degradable under aerobic conditions but it undergoes degradation under anaerobic conditions. Thus, based on theexperimental study from peer reviewed journal (2010), it can be concluded that the chemical sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate can be expected to be inherently 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 sodium 3-[(4-anilinophenyl)diazenyl] benzenesulfonate (CAS No. 587 -98 -4). If released in to the environment, 13.8% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate in water is estimated to be 60 days (1440 hrs). The half-life (60 days estimated by EPI suite) indicates that the chemical is persistent in water and the exposure risk to aquatic animals is moderate to high whereas the half-life period of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate in sediment is estimated to be 541.66 days (13000 hrs). However, as the percentage release of test chemical into the sediment is less than 2% (i.e, reported as 1.36%), indicates that sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate is not persistent in sediment.
Biodegradation in soil
The half-life period of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate (CAS No. 587 -98 -4) 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, 84.8% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate in soil is estimated to be 120 days (2880 hrs). Based on this half-life value of sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate, 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 overall results for the target chemical sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate, the substance sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate can be considered to be inherently biodegradable in nature.
Bioaccumulation: aquatic/sediment
From CompTox Chemistry Dashboard using OPERA (OPEn (quantitative) structure-activity Relationship Application) V1.02 model in which calculation based on PaDEL descriptors (calculate molecular descriptors and fingerprints of chemical), the bioaccumulation i.e BCF for test substance sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate was estimated to be 8.87 dimensionless . The predicted BCF result based on the 5 OECD principles. Thus based on the result it is concluded that the test substance sodium 3-[(4-anilinophenyl)diazenyl] benzenesulfonate is non-bioaccumulative in nature.
Adsorption/desorption
The adsorption coefficient Koc in soil and in sewage sludge Sodium 3-(panilinophenylazo) benzenesulphonate(CAS No.587-98-4) was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 121 for testing of Chemicals. The reference substances were chosen according to functional similarity with the test substance and calibration graph prepared. The reference substances were N-methylaniline, 2 - nitrophenol, Nitrobenzene, 4 -Nitrobenzamide, N,N-dimethylbenzamide, N-methylbenzamide, Benzamide having Koc value ranging from 1.239 to 2.47 The Log Koc value was found to be 1.697 ± 0.002 (Koc= 48.977) at 25°C.
This value indicates that the substance has low sorption to soil and sediment, moderate migration to ground water.
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