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EC number: 280-898-0 | CAS number: 83803-79-6
Endpoint summary
Administrative data
Description of key information
Biodegradation in water
Biodegradability of N-(4-((4-(dimethylamino)phenyl)(4-(phenylamino)naphthalen-1-yl)methylene)cyclohexa-2,5-dienylidene)-N-methylmethanaminium acetate (CAS no. 83803 -79 -6) is predicted using OECD QSAR toolbox version 3.3 (2017) with logKow as the primary descriptor. Test substance undergoes 25.65% degradation by BOD in 28 days. Thus, based on percentage degradation, the test chemical N-(4 -((4 -(dimethylamino)phenyl)(4 -(phenylamino)naphthalen-1 -yl)methylene) cyclohexa-2,5-dienylidene)-N-methylmethana minium acetate 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
N-(4 -((4 -(dimethylamino)phenyl)(4 -(phenylamino)naphthalen-1 -yl)methylene)cyclohexa-2,5 -dienylidene)-N-methylmethanaminium acetate
(CAS No. 83803 -79 -6). If released in to the environment, 0.563% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of test chemical in water is estimated to be 180 days (4320 hrs). The half-life (180 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 test chemical in sediment is estimated to be 1620.833 days (38900 hrs). Based on this half-life value, it indicates that N-(4 -((4 -(dimethylamino)phenyl)(4 -(phenylamino)naphthalen-1-yl)methylene) cyclohexa-2,5 -dienylidene)-N-methylmethanaminium acetate is persistent in sediment.
Biodegradation in soil
The half-life period of N-(4-((4-(dimethylamino)phenyl)(4-(phenylamino)naphthalen-1-yl)methylene)cyclohexa-2,5-dienylidene)-N-methylmethanaminium acetate (CAS No. 83803 -79 -6) 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, 51.7% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of test chemical in soil is estimated to be 360 days (8640 hrs). Based on this half-life value of test chemical, it is concluded that the chemical N-(4-((4-(dimethylamino)phenyl)(4 -(phenyl amino)naphthalen-1-yl)methylene)cyclohexa-2,5-dienylidene)-N-methylmethanaminium acetate is persistent in the soil environment and the exposure risk to soil dwelling animals is moderate to high.
Additional information
Biodegradation in water
Various predicted data for the target compound N-(4-((4-(dimethylamino)phenyl)(4-(phenylamino)naphthalen-1-yl)methylene)cyclohexa-2,5-dienylidene)-N-methyl methanaminium acetate(CAS No. 83803-79-6) and supporting weight of evidence studies for its closest read across substance based on structural similarity and with logKow as the primary descriptor 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 chemicalN-(4-((4-(dimethylamino)phenyl)(4-(phenylamino)naphthalen-1-yl)methylene)cyclohexa-2,5-dienylidene)-N-methylmethanaminium acetate(CAS No. 83803-79-6) was estimated.Test substance undergoes 25.65% degradation by BOD in 28 days. Thus, based on percentage degradation, the test chemical N-(4 -((4 -(dimethylamino)phenyl)(4 -(phenylamino)naphthalen-1 -yl)methylene) cyclohexa-2,5-dienylidene)-N-methylmethanaminium acetate was 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 compoundN-(4-((4-(dimethylamino)phenyl)(4-(phenylamino)naphthalen-1-yl)methylene)cyclohexa-2,5-dienylidene)-N-methylmethanaminium acetate(CAS No. 83803-79-6) 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 chemical N-(4-((4-(dimethylamino)phenyl)(4-(phenylamino)naphthalen-1-yl)methylene)cyclohexa-2,5-dienylidene)-N-methylmethanaminium acetateis expected to be not readily biodegradable.
In a supporting weight of evidence study from peer reviewed journal (H. Heukelekian and M. C. Rand, 1955) for the read across chemical [4-[α-[4-(dimethylamino)phenyl]benzylidene]cyclohexa-2,5-dien-1-ylidene]dimethylammonium chloride (CAS no. 569-64-2),biodegradation experiment was conducted for 5 days for evaluating the percentage biodegradability of read across substance [4-[α-[4-(dimethylamino)phenyl]benzylidene]cyclohexa-2,5-dien-1-ylidene]dimethylammonium chloride using standard dilution method at a temperature of 20°C. Sewage was used as a test inoculum. The 5 day BOD value of chemical [4-[α-[4-(dimethylamino)phenyl]benzylidene]cyclohexa-2,5-dien-1-ylidene]dimethylammonium chloride was determined to be 0 g/g. Thus, based on this value, [4-[α-[4-(dimethylamino)phenyl]benzylidene]cyclohexa-2,5-dien-1-ylidene]dimethylammonium chloride is considered to be not readily biodegradable in nature.
Another biodegradation study was conducted for 14 days for evaluating the percentage biodegradability of the same read across substance [4-[α-[4-(dimethylamino)phenyl]benzylidene]cyclohexa-2,5-dien-1-ylidene]dimethylammonium chloride (CAS no. 569-64-2) (EnviChem, 2014). The study was performed according to OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I). Activated sludge was used as a test inoculums for the study. 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 [4-[α-[4-(dimethylamino)phenyl]benzylidene]cyclohexa-2,5-dien-1-ylidene]dimethylammonium chloride was determined to be 0.3% by BOD parameter in 14 days. Thus, based on percentage degradation, [4-[α-[4-(dimethylamino)phenyl]benzylidene]cyclohexa-2,5-dien-1-ylidene]dimethylammonium chloride is considered to be not readily biodegradable in nature.
For the read across chemical N-(1-methylheptyl)-N'-phenylbenzene-1,4-diamine (CAS no. 15233-47-3), biodegradation study was conducted for 28 days for evaluating the percentage biodegradability of read across substance N-(1 -methylheptyl)-N'-phenylbenzene-1,4 –diamine (J-CHECK, 2017). The study was performed according to OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I)). 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 be4 and 0% degradation by O2 consumption and HPLC parameter in 28 days.The test substance was partially changed in test system to form 2% of 4- Hydroxy diphenylamine (not highly bioaccumulative), 5 to 8% of 1-Methylheptylamine and less than 1 % of N-phenyl-p-benzo quinonimine (not highly bioaccumulative). In addition, 4 % of Aniline (ready biodegradable) was produced only in (Activated sludge + test substance) system. Thus, based on percentage degradation, N-(1 -methylheptyl)-N'-phenylbenzene-1,4 -diamine is considered to be not readily biodegradable in nature.
On the basis of above results for target chemicalN-(4-((4-(dimethylamino)phenyl)(4-(phenylamino)naphthalen-1-yl)methylene)cyclohexa-2,5-dienylidene)-N-methyl methanaminium acetate(from OECD QSAR toolbox version 3.3 and EPI suite, 2017) and for its read across substance (from peer reviewed journal and authoritative database J-CHECK & EnviChem), it can be concluded that the test substanceN-(4-((4-(dimethylamino)phenyl)(4-(phenylamino)naphthalen-1-yl)methylene)cyclohexa-2,5-dienylidene)-N-methylmethanaminium acetate 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
N-(4 -((4 -(dimethylamino)phenyl)(4 -(phenylamino)naphthalen-1 -yl)methylene)cyclohexa-2,5 -dienylidene)-N-methylmethanaminium acetate
(CAS No. 83803 -79 -6). If released in to the environment, 0.563% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of test chemical in water is estimated to be 180 days (4320 hrs). The half-life (180 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 test chemical in sediment is estimated to be 1620.833 days (38900 hrs). Based on this half-life value, it indicates that N-(4 -((4 -(dimethylamino)phenyl)(4 -(phenylamino)naphthalen-1-yl)methylene) cyclohexa-2,5 -dienylidene)-N-methylmethanaminium acetate is persistent in sediment.
Biodegradation in soil
The half-life period of N-(4-((4-(dimethylamino)phenyl)(4-(phenylamino)naphthalen-1-yl)methylene)cyclohexa-2,5-dienylidene)-N-methylmethanaminium acetate (CAS No. 83803 -79 -6) 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, 51.7% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of test chemical in soil is estimated to be 360 days (8640 hrs). Based on this half-life value of test chemical, it is concluded that the chemical N-(4-((4-(dimethylamino)phenyl)(4 -(phenyl amino)naphthalen-1-yl)methylene)cyclohexa-2,5-dienylidene)-N-methylmethanaminium acetate is persistent in the soil environment and the exposure risk to soil dwelling animals is moderate to high.
On the basis of available information, the test substance N-(4 -((4 -(dimethylamino)phenyl)(4 -(phenylamino)naphthalen-1 -yl)methylene)cyclohexa-2,5 -dienylidene)-N-methyl methanaminium acetate can be considered to be not readily biodegradable in nature.
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