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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Reference
Endpoint:
bioaccumulation in aquatic species, other
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Justification for type of information:
Estimated data generated using the EPI Suite program developed by the USEPA.
Qualifier:
according to
Guideline:
other: Modeling database
Principles of method if other than guideline:
Prediction done using BCFBAF (v3.01) model
GLP compliance:
not specified
Specific details on test material used for the study:
- Name of test material: 4-hydroxy-7-[(5-hydroxy-7-sulfonaphthalen-2-yl)amino]naphthalene-2-sulfonic acid
- Molecular formula: C20H15NO8S2
- Molecular weight: 461.47 g/mol
- Smiles notation: O=S(=O)(O)c1cc(O)c2c(cc(Nc3ccc4c(cc(S(=O)(=O)O)cc4O)c3)cc2)c1
- InChl: 1S/C20H15NO8S2/c22-19-9-15(30(24,25)26)7-11-5-13(1-3-17(11)19)21-14-2-4-18-12(6-14)8-16(10-20(18)23)31(27,28)29/h1-10,21-23H,(H,24,25,26)(H,27,28,29)
- Substance type: Organic
- Physical state: Solid
Radiolabelling:
not specified
Vehicle:
not specified
Test organisms (species):
other: Fish
Route of exposure:
aqueous
Test type:
not specified
Water / sediment media type:
natural water: freshwater
Test temperature:
25 deg.C
Reference substance (positive control):
not specified
Key result
Temp.:
25 °C
Type:
BCF
Value:
3.162 L/kg
Basis:
whole body w.w.
Calculation basis:
other: estimated
Remarks on result:
other: Non-bioaccumulative

BCFBAF Program (v3.01) Results:

==============================

SMILES : O=S(=O)(O)c(cc(O)c(c1cc(Nc(ccc(c2cc(S(=O)(=O)O)c3)c3O)c2)c4)c4)c1

CHEM : 2-Naphthalenesulfonic acid, 7,7'-iminobis 4-hydroxy-

MOL FOR: C20 H15 N1 O8 S2

MOL WT : 461.46

--------------------------------- BCFBAF v3.01 --------------------------------

Summary Results:

Log BCF (regression-based estimate): 0.50 (BCF = 3.16 L/kg wet-wt)

Biotransformation Half-Life (days) : 0.00308 (normalized to 10 g fish)

Log BAF (Arnot-Gobas upper trophic): -0.02 (BAF = 0.964 L/kg wet-wt)

Log Kow (experimental): not available from database

Log Kow used by BCF estimates: 0.58

Equation Used to Make BCF estimate:

Log BCF = 0.50 (Ionic; Log Kow dependent)

Estimated Log BCF = 0.500 (BCF = 3.162 L/kg wet-wt)

Validity criteria fulfilled:
not specified
Conclusions:
The bioconcentration factor (BCF) of 4-hydroxy-7-[(5-hydroxy-7-sulfonaphthalen-2-yl)amino]naphthalene-2-sulfonic acid was estimated to be 3.162 L/kg whole body w.w (at 25 deg C) which does not exceed the bio concentration threshold of 2000, indicating that the chemical is not expected to bioaccumulate in the food chain.
Executive summary:

BCFBAF model (v3.01) of Estimation Programs Interface (EPI Suite, 2017) was used to predict the bioconcentration factor (BCF) of test chemical 4 -hydroxy-7 -[(5 -hydroxy-7 -sulfonaphthalen-2 -yl)amino]naphthalene-2-sulfonic acid (CAS No. 87 -03 -6). The bioconcentration factor (BCF) of 4 -hydroxy-7 -[(5 -hydroxy-7 -sulfonaphthalen-2 -yl)amino]naph thalene-2 -sulfonic acid was estimated to be 3.162 L/kg whole body w.w (at 25 deg C) which does not exceed the bio concentration threshold of 2000, indicating that the chemical 4-hydroxy-7-[(5-hydroxy-7-sulfonaphthalen-2-yl)amino]naphthalene-2-sulfonic acid is not expected to bioaccumulate in the food chain.

Description of key information

BCFBAF model (v3.01) of Estimation Programs Interface (EPI Suite, 2017) was used to predict the bioconcentration factor (BCF) of test chemical 4 -hydroxy-7 -[(5 -hydroxy-7 -sulfonaphthalen-2 -yl)amino]naphthalene-2-sulfonic acid (CAS No. 87 -03 -6). The bioconcentration factor (BCF) of 4 -hydroxy-7 -[(5 -hydroxy-7 -sulfonaphthalen-2 -yl)amino]naph thalene-2 -sulfonic acid was estimated to be 3.162 L/kg whole body w.w (at 25 deg C) which does not exceed the bio concentration threshold of 2000, indicating that the chemical

4-hydroxy-7-[(5-hydroxy-7-sulfonaphthalen-2-yl)amino]naphthalene-2-sulfonic acid is not expected to bioaccumulate in the food chain.

Key value for chemical safety assessment

BCF (aquatic species):
3.162 L/kg ww

Additional information

Various predicted data for the target compound 4-hydroxy-7-[(5-hydroxy-7-sulfonaphthalen-2-yl)amino]naphthalene-2-sulfonic acid (CAS No. 87-03-6) and supporting weight of evidence study for its read across substance were reviewed for the bioaccumulation end point which are summarized as below:

 

In aprediction done using theBCFBAF Program(v3.01) of Estimation Programs Interface (EPI Suite, 2017) was used to predict the bioconcentration factor (BCF) of test chemical 4 -hydroxy-7 -[(5 -hydroxy-7 -sulfonaphthalen-2 -yl)amino]naphthalene-2-sulfonic acid (CAS No. 87 -03 -6). The bioconcentration factor (BCF) of 4 -hydroxy-7 -[(5 -hydroxy-7 -sulfonaphthalen-2 -yl)amino]naph thalene-2 -sulfonic acid was estimated to be 3.162 L/kg whole body w.w (at 25 deg C).

 

In an another prediction done by using Bio-concentration Factor (v12.1.0.50374) moduleACD (Advanced Chemistry Development)/I-Lab predictive module, 2017), theBCF over the entire pH scale (pH 1 -14) of the test substance 4 -hydroxy-7 -[(5 -hydroxy-7 -sulfonaphthalen-2 -yl)amino]naphthalene-2-sulfonic acid (CAS no. 87 -03 -6) was estimated to be approx. 1.

Bioconcentration Factor (BCF) of test chemical 4-hydroxy-7-[(5-hydroxy-7-sulfonaphthalen-2-yl)amino]naphthalene-2-sulfonic acid was estimated using Chemspider database(ChemSpider, 2017). The bioconcentration factor of test substance 4-hydroxy-7-[(5-hydroxy-7-sulfonaphthalen-2-yl)amino]naphthalene-2-sulfonic acid was estimated to be 1 at both pH 5.5 and 7.4, respectively.

 

Another predicted data was estimated usingSciFinder database (American Chemical Society (ACS), 2017) was used for predicting the bioconcentration factor (BCF) of test chemical 4 -hydroxy-7 -[(5 -hydroxy-7 -sulfonaph thalen-2 -yl)amino]naphthalene-2-sulfonic acid (CAS No. 87 -03 -6). The bioconcentration factor (BCF) of 4 -hydroxy-7 -[(5 -hydroxy-7 -sulfonaphthalen-2 -yl)amino]naphtha lene-2 -sulfonic acid was estimated to be 1 (at 25 deg C).

 

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 4 -hydroxy-7 -[(5 -hydroxy-7 -sulfonaphthalen-2 -yl)amino]naphthalene-2 -sulfonic acid was estimated to be 2.37 dimensionless . The predicted BCF result based on the 5 OECD principles. Thus based on the result it is concluded that the test substance 4-hydroxy-7-[(5-hydroxy-7-sulfonaphthalen-2-yl)amino]naphthalene-2-sulfonic acid is non-bioaccumulative in nature.

 

In a supporting weight of evidence study from authoritative database (J-CHECK, 2017) for the read across chemical disodium 4-hydroxy-7-{[(5-hydroxy-7-sulfonato-2-naphthyl)carbamoyl]amino}naphthalene-2-sulfonate (CAS no. 20324-87-2), bioaccumulation study was conducted on test organism Cyprinus carpio for 6 weeks for evaluating the bioconcentration factor (BCF value) of disodium 4-hydroxy-7-{[(5-hydroxy-7-sulfonato-2-naphthyl)carbamoyl]amino}naphthalene-2-sulfonate. The study was performed according to other guideline "Bioaccumulation test of a chemical substance in fish or shellfish" provided in "the Notice on the Test Method Concerning New Chemical Substances", respectively. Cyprinus carpio was used as a test organism for the study. Test chemical nominal conc. used for the study were2mg/land 0.2 mg/l, respectively. Analytical method involve the recovery ratio: Test water: 1st concentration area : 93.5 %, 2nd concentration area : 94.3 %, Fish : 98.9 %, - Limit of detection : Fish : 0.37 ppm. Range finding study involve the TLm (48 hr) ≥ 1000 mg/l (w/v) on Rice fish (Oryzias latipes). Lipid content of the test organism Cyprinus carpio was determined to be 2.8%. The bioconcentration factor (BCF value) of substance disodium 4-hydroxy-7-{[(5-hydroxy-7-sulfonato-2-naphthyl)carbamoyl]amino}naphthalene-2-sulfonate on Cyprinus carpio was determined to be ≤ 0.19 L/Kg at a conc. of 2 mg/l and ≤ 1.8 L/Kg at a conc. of 0.2 mg/l, respectively.

 

For the read across chemical 4,4'-dihydroxy-7,7'-ureylenedi(naphthalene-2-sulphonic acid) (CAS no. 134-47-4), bioaccumulation study was conducted on test organism Cyprinus carpio for 6 weeks for evaluating the bioconcentration factor (BCF value) of read across chemical 4,4'-dihydroxy-7,7'- ureylenedi(naphthalene-2 -sulphonic acid). Cyprinus carpio was used as a test organism for the study. Test chemical nominal conc. used for the study were 2mg/l and 0.2 mg/l, respectively. The bioconcentration factor (BCF value) of substance 4,4'-dihydroxy-7,7'-ureylenedi(naphthalene-2 -sulphonic acid) on Cyprinus carpio was determined to be < 0.19 L/Kg at a conc. of 2 mg/l and < 1.8 L/Kg at a conc. of 0.2 mg/l, respectively.

 

On the basis of above results for target chemical 4 -hydroxy-7-[(5-hydroxy-7-sulfonaphthalen-2-yl)amino]naphthalene-2-sulfonic acid(from EPI suite, ACD labs,ChemSpider, SciFinder database and CompTox Chemistry Dashboard,  2017) and for its read across substance (from authoritative database J-CHECK, 2017 and EnviChem, 2014), it can be concluded that the BCF value of test substance 4-hydroxy-7-[(5-hydroxy-7-sulfonaphthalen-2-yl)amino]naphthalene-2-sulfonic acid ranges from 1 – 3.162 which does not exceed the bioconcentration threshold of 2000, indicating that the chemical 4-hydroxy-7-[(5-hydroxy-7-sulfonaphthalen-2-yl)amino]naphthalene-2-sulfonic acid is not expected to bioaccumulate in the food chain.