Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Biodegradation in water:

Biodegradability of test chemical 4-amino-3,6-bis[[4-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-5-hydroxynaphthalene-2,7-disulphonic acid

(CAS no. 51357 -74 -5)was estimated by using OECD QSAR tool box v3.4 by considering eight cloest read across chemicals with log KOw as primary descriptor. Percent biodegradability of test chemical 4-amino-3,6-bis[[4-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-5-hydroxynaphthalene-2,7-disulphonic acid  was estimated to be 0.11% by considering BOD as parameter  and microorganisms as inoculum in 28 days.On the basis of this percent biodegraddability it is conccluded that test chemical 4-amino-3,6-bis[[4-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-5-hydroxynaphthalene-2,7-disulphonic acid  is not readily biodegradable.

Additional information

Biodegradation in water:

Predicted data for the target compound4-amino-3,6-bis[[4-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-5-hydroxynaphthalene-2,7-disulphonic acid

(CAS no. 51357 -74 -5)and supporting weight of evidence studies for its read across substance were reviewed for the biodegradation end point which are summarized as below:

In first weight of evidence study the biodegradability of test chemical 4-amino-3,6-bis[[4-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-5-hydroxynaphthalene-2,7-disulphonic acid (CAS no. 51357 -74 -5)was estimated by using OECD QSAR tool box v3.4 by considering eight closet read across chemicals with log KOw as primary descriptor. Percent biodegradability of test chemical 4-amino-3,6-bis[[4-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-5-hydroxynaphthalene-2,7-disulphonic acid  was estimated to be 0.11% by considering BOD as parameter  and microorganisms as inoculum in 28 days. On the basis of this percent biodegradability it is concluded that test chemical 4-amino-3,6-bis[[4-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-5-hydroxynaphthalene-2,7-disulphonic acid  is not readily biodegradable.

 

Second weight of evidence study was done by using Estimation Programs Interface Suite (EPI suite, 2017)in this study the biodegradation potential of the test compound 4-amino-3,6-bis[[4-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-5-hydroxynaphthalene-2,7-disulphonic acid (CAS no. 51357 -74 -5) was estimated 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 Biowin 1-7, respectively) of the BIOWIN v4.10 software. The results indicate that chemical 4-amino-3,6-bis[[4-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-5-hydroxynaphthalene-2,7-disulphonic acid is expected to be not readily biodegradable.

 

Third weight of evidence study was done from chemosphere journal Vo1.15, No.4, pp 479-491 (1986)by U. Pagga and O. Brown in this study the aerobic biodegradation experiment was performed for read across chemical 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3,6-bis[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4)( CAS no.17095-24-8) using activated sludge at concentration 0.5 g/L dry material as inoculums and initial concentration of chemical taken was 100mg/L for 28 days. By considering DOC removal parameter the read across chemical showed -53 % degradation in 28 days. This read across chemical was categorized in D category which shows no elimination in static test. This percentage value is also very less So it is concluded that chemical 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3,6-bis[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4) is not readily biodegradable.

 

Last weight of evidence study was done from authoritative database ( J check, 2017) in this study the read across chemical 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3,6-bis[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4) (CAS no. 17095-24-8) was subjected to biodegradation test by taking activated sludge as inoculums at 30 mg/L concentration. Biodegradation was analysed by using BOD, TOC and HPLC parameters. The initial concentration of read across chemical was 100 mg/L. The study design used was of standard type. The read across chemical 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3,6-bis[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4) showed 4.0 % and 9 % biodegradation by considering BOD and TOC as parameter respectively but it showed 96 % biodegradation by HPLC parameter . Percent biodegradability values of read across chemical by BOD and TOC parameters are very low but by HPLC parameter read across chemical showed very high biodegradability but this high value of biodegradation is not due complete degradation of read across chemical but it is due to partial change of read across chemical and formation of 4-Amino-5-hydroxy-3,6-bis[4-(vinylsulfonyl)phenylazo]-2,7-naphthalenedisulfonic acid . Therefore on the basis of percent biodegradability by BOD and TOC parameters it is concluded that read across chemical 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3,6-bis[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4) is not readily biodegradable.

 

On the basis of results of above mentioned studies for target chemical4-amino-3,6-bis[[4-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-5-hydroxynaphthalene-2,7-disulphonic acid (CAS no. 51357-74-5)(from OECD QSAR tool box v3.4 and EPI suite) and supporting weight of evidence study (from, Chemosphere journal and J Check, 2017). It is concluded that the test chemical4-amino-3,6-bis[[4-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphophenyl]azo]-5-hydroxynaphthalene-2,7-disulphonic acidcan be expected to be not readily biodegradable.