2-chloro-4-nitrophenol

Bioaccumulation: aquatic / sediment

Link to relevant study record(s)

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

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 (IUPAC name): 2-Chloro-4-nitrophenol
- Molecular formula: C6H4ClNO3
- Molecular weight: 173.555 g/mol
- Smiles notation: c1(cc(c(O)cc1)Cl)[N+](=O)[O-]
- InChl: 1S/C6H4ClNO3/c7-5-3-4(8(10)11)1-2-6(5)9/h1-3,9H
- 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:

22.45 L/kg

Basis:

whole body w.w.

Calculation basis:

other: estimated

Remarks on result:

other: Non-bioaccumulative

BCFBAF Program (v3.01) Results:

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

SMILES : N(=O)(=O)c(ccc(O)c1CL)c1

CHEM : Phenol, 2-chloro-4-nitro-

MOL FOR: C6 H4 CL1 N1 O3

MOL WT : 173.56

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

Summary Results:

Log BCF (regression-based estimate): 1.35 (BCF = 22.5 L/kg wet-wt)

Biotransformation Half-Life (days) : 0.114 (normalized to 10 g fish)

Log BAF (Arnot-Gobas upper trophic): 1.30 (BAF = 20 L/kg wet-wt)

Log Kow (experimental): not available from database

Log Kow used by BCF estimates: 2.55

Equation Used to Make BCF estimate:

Log BCF = 0.6598 log Kow - 0.333 + Correction

Correction(s): Value

No Applicable Correction Factors

Estimated Log BCF = 1.351 (BCF = 22.45 L/kg wet-wt)

Validity criteria fulfilled:

not specified

Conclusions:

The bioconcentration factor (BCF) of 2-Chloro-4-nitrophenol was estimated to be 22.45 L/kg whole body w.w (at 25 deg C) which does not exceed the bio concentration threshold of 2000, indicating that the chemical 2-Chloro-4-nitrophenol 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 2-Chloro-4-nitrophenol (CAS No. 619 -08 -9). The bioconcentration factor (BCF) of 2-Chloro-4-nitrophenol was estimated to be 22.45 L/kg whole body w.w (at 25 deg C) which does not exceed the bio concentration threshold of 2000, indicating that the chemical 2-Chloro-4-nitrophenol 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 2-Chloro-4-nitrophenol (CAS No. 619 -08 -9). The bioconcentration factor (BCF) of 2-Chloro-4-nitrophenol was estimated to be 22.45 L/kg whole body w.w (at 25 deg C) which does not exceed the bio concentration threshold of 2000, indicating that the chemical 2-Chloro-4-nitrophenol is not expected to bioaccumulate in the food chain.

Key value for chemical safety assessment

BCF (aquatic species):

22.45 L/kg ww

Additional information

Various predicted data for the target compound 2-Chloro-4-nitrophenol (CAS No. 619-08-9) 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 2-Chloro-4-nitrophenol (CAS No. 619 -08 -9). The bioconcentration factor (BCF) of 2-Chloro-4-nitrophenol was estimated to be 22.45 L/kg whole body w.w (at 25 deg C).

 

Bioconcentration Factor (BCF) of test chemical 2-Chloro-4-nitrophenol (CAS no. 619 -08 -9) was estimated using Chemspider database(ChemSpider, 2017). The bioconcentration factor of test substance 2-Chloro-4-nitrophenol was estimated to be 16.55 at pH 5.5 and 1.0 at pH 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 2-Chloro-4-nitrophenol (CAS No. 619 -08 -9). The bioconcentration factor (BCF) of 2-Chloro-4-nitrophenol was estimated to be 32.5, 32.4, 31.4, 23.7, 6.92 and 1.0 at pH 1-2, 3, 4, 5, 6 and 7-10, respectively (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 2-Chloro-4-nitrophenol was estimated to be 15.8 dimensionless. The predicted BCF result based on the 5 OECD principles. Thus based on the result it is concluded that the test substance 2-Chloro-4-nitrophenol is non-bioaccumulative in nature.

 

In a supporting weight of evidence study from authoritative database (HSDB, 2017) for the read across chemical 2-chloro-4-nitroaniline (CAS no.121-87-9),bioaccumulation experiment in fish was conducted for estimating the BCF (bioaccumulation factor) value of read across chemical 2-chloro-4-nitroaniline. The bioaccumulation factor (BCF) value was calculated using a log Kow of 2.14 and a regression-derived equation. The estimated BCF (bioaccumulation factor) value of 2-chloro-4-nitroaniline was determined to be 9 dimensionless.

 

For the read across chemical 1,2-Dichloro-4-nitrobenzene (CAS no. 99-54-7),bioaccumulation study was conducted on test organism Cyprinus carpio for 8 weeks for evaluating the bioconcentration factor (BCF value) of chemical 1,2 -Dichloro-4 –nitrobenzene (J-CHECK, 2017 and EnviChem, 2014).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 were 0.05mg/land 0.005 mg/l, respectively. Test chemical solution was prepared in HCC. Analytical method involve the recovery ratio: Test water : 1st concentration area : 97.8 %, 2nd concentration area : 98.9 %, Fish : 93.1 %, - Limit of detection : Test water: 1st concentration area : 1.6 ng/ml, 2nd concentration area : 0.15 ng/ml, Fish : 7.4 ng/g. Range finding study involve the LC50 (48 hr) 7.01 mg/l on Rice fish (Oryzias latipes). Lipid content of the test organism Cyprinus carpio was determined to be 4.3%. The bioconcentration factor (BCF value) of substance 1,2-Dichloro-4-nitrobenzene on Cyprinus carpio was determined to bein the range of 26-59 L/Kg at a conc. of 0.05 mg/l and 37-65 L/Kg at a conc. of 0.005 mg/l, respectively.

 

On the basis of above results for target chemical 2-Chloro-4-nitrophenol (from EPI suite,ChemSpider, SciFinder database and CompTox Chemistry Dashboard,  2017) and for its read across substance (from authoritative database J-CHECK & HSDB, 2017 and EnviChem, 2014), it can be concluded that the BCF value of test substance 2-Chloro-4-nitrophenol ranges from 1.0 –32.5 which does not exceed the bioconcentration threshold of 2000, indicating that the chemical 2-Chloro-4-nitrophenol is not expected to bioaccumulate in the food chain.