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Environmental fate & pathways

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Bioaccumuation: aquatic/sediments:

Using BCFBAF Program (v3.00) model of EPI suite 2017 the estimated bio concentration factor (BCF) for Trisodium 2-[(E)-2-(3-methyl-5-oxo-1-{4-[2-(sulfonatooxy)ethanesulfonyl]phenyl}-4,5-dihydro-1H-pyrazol-4-yl)diazen-1-yl]naphthalene-1,5-disulfonate  (CAS No. 20298-05-9) is 3.162 L/kg wet-wt at 25 deg. c which does not exceed the bioconcentration threshold of 2000. Therefore it is concluded that test chemical Trisodium 2-[(E)-2-(3-methyl-5-oxo-1-{4-[2-(sulfonatooxy)ethanesulfonyl]phenyl}-4,5-dihydro-1H-pyrazol-4-yl)diazen-1-yl]naphthalene-1,5-disulfonate is non bioaccumulative in food chain.

Additional information

Bioaccumuation: aquatic/sediments:

Predicted data study for target chemical Trisodium 2-[(E)-2-(3-methyl-5-oxo-1-{4-[2-(sulfonatooxy)ethanesulfonyl]phenyl}-4,5-dihydro-1H-pyrazol-4-yl)diazen-1-yl]naphthalene-1,5-disulfonate  (CAS No. 20298-05-9) and two experimental studies for its structurally similar read across

 Chemicals are summarized below.

 

The first weight of evidence study was done by Using BCFBAF Program (v3.00) model of Estimation Program Interface (EPI suite 2017) the estimated bio concentration factor (BCF) for Trisodium 2-[(E)-2-(3-methyl-5-oxo-1-{4-[2-(sulfonatooxy)ethanesulfonyl]phenyl}-4,5-dihydro-1H-pyrazol-4-yl)diazen-1-yl]naphthalene-1,5-disulfonate  (CAS No. 20298-05-9) is 3.162 L/kg wet-wt at 25 deg. c which does not exceed the bioconcentration threshold of 2000. Therefore it is concluded that test chemical Trisodium 2-[(E)-2-(3-methyl-5-oxo-1-{4-[2-(sulfonatooxy)ethanesulfonyl]phenyl}-4,5-dihydro-1H-pyrazol-4-yl)diazen-1-yl]naphthalene-1,5-disulfonate is non bioaccumulative in food chain.

 

 Next weight of evidenc e study was done by using authoritative database (Jcheck, 2017) in this study the bioaccumulation test was conducted for 6 weeks for determination the bioconcentration factor (BCF) of read across chemical trisodium 5-hydroxy-1-(4-sulphophenyl)-4-(4-sulphophenylazo)pyrazole-3-carboxylate (CAS no 1934-21-0) on test organism Cyprinus carpio. Recovery ratio of Test water was at 1st concentration area : 91.7 % and at 2nd concentration area : 83 .0%, Fish : 90.6 %, and Limit of detection in Fish was 0.17 mg/L Nominal concentrations used was 1st Concentration area: 0.6 mg/L (w/v), 2nd Concentration area: 0.06 mg/L (w/v) and Range finding study was carried out on Rice fish (Oryzias latipes) TLm(48h) ≥ 1000 ppm(w/v). The lipid content of fish was 2.8 %.

 

Thus according to static Fish test the BCF value for trisodium 5-hydroxy-1-(4-sulphophenyl)-4-(4-sulphophenylazo)pyrazole-3-carboxylate was observed to be ≤0.29 L/kg at dose concentration 0.6 mg/L and ≤ 3 L/kg at dose concentration 0.06 mg/L on test organism Cyprinus carpio during 6 weeks period.

 

These BCF values indicate that the substance trisodium 5-hydroxy-1-(4-sulphophenyl)-4-(4-sulphophenylazo)pyrazole-3-carboxylate is not bioaccumulative in fish and food chain as these values are far less than 2000 criteria.

 

Last weight of evidence study was also done from authoritative database (HSDB, 2017) in this study the ionic character of read across chemical disodium 6-hydroxy-5-[(4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate(CAS no. 2783-94-0)suggests the potential for bioconcentration in aquatic organisms is expected to be low.

 

On the basis of all the studies mentioned above it can be concluded that test chemical Trisodium 2-[(E)-2-(3-methyl-5-oxo-1-{4-[2-(sulfonatooxy)ethanesulfonyl]phenyl}-4,5-dihydro-1H-pyrazol-4-yl)diazen-1-yl]naphthalene-1,5-disulfonate  (CAS No. 20298-05-9) is expected to be non bioaccumulative in nature.