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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 (IUPAC name): Tributylmethylammonium chloride
- Common name: Methy tributyl ammonium chloride (MTBAC)
- Molecular formula: C13H30ClN
- Molecular weight: 235.84 g/mol
- Smiles : [N+](CCCC)(CCCC)(CCCC)C.[ClH-]
- InChI : 1S/C13H30N.ClH/c1-5-8-11-14(4,12-9-6-2)13-10-7-3;/h5-13H2,1-4H3;1H/q+1;/p-1
- Substance Type: Organic
- Physical State: Liquid
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 : N(CL)(C)(CCCC)(CCCC)CCCC

CHEM : 1-Butanaminium, N,N-dibutyl-N-methyl-, chloride

MOL FOR: C13 H30 CL1 N1

MOL WT : 235.84

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

Summary Results:

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

Biotransformation Half-Life (days) : 0.171 (normalized to 10 g fish)

Log BAF (Arnot-Gobas upper trophic): 0.02 (BAF = 1.05 L/kg wet-wt)

Log Kow (experimental): not available from database

Log Kow used by BCF estimates: 0.24

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 Tributylmethylammonium chloride 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 Tributylmethylammonium chloride is not expected to bioaccumulate in the food chain.
Executive summary:

BCFBAF model of Estimation Programs Interface was used to predict the bioconcentration factor (BCF) of test chemical Tributylmethylammonium chloride (CAS No. 56375 -79 -2). The bioconcentration factor (BCF) of Tributylmethylammonium chloride 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 Tributylmethylammonium chloride is not expected to bioaccumulate in the food chain.

Description of key information

BCFBAF model of Estimation Programs Interface was used to predict the bioconcentration factor (BCF) of test chemical Tributylmethylammonium chloride (CAS No. 56375 -79 -2). The bioconcentration factor (BCF) of Tributylmethylammonium chloride 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 Tributylmethylammonium chloride 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 Tributylmethylammonium chloride (CAS No. 56375-79-2) and supporting weight of evidence studies for its structurally similar read across substance were reviewed for the bioaccumulation end point which are summarized as below:

 

In a prediction done using the BCFBAF Program of Estimation Programs Interface was used to predict the bioconcentration factor (BCF) of test chemical Tributylmethylammonium chloride (CAS No. 56375 -79 -2). The bioconcentration factor (BCF) of Tributylmethylammonium chloride was estimated to be 3.162 L/kg whole body w.w (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 Tributylmethylammonium chloride (CAS no. 56375 -79 -2) was estimated to be 5.62 dimensionless . The predicted BCF result based on the 5 OECD principles.

 

In a supporting weight of evidence study from authoritative database (2018) for the test item,bioaccumulation experiment was conducted on test organism Cyprinus carpio for 28 days for evaluating the bioconcentration factor (BCF value) of test chemical. The study was performed according to OECD Guideline 305 (Bioconcentration: Flow-through Fish Test) or 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 was prepared in HCO-40.Test chemical nominal conc. used for the study was 0.1 mg/l and 0.01 mg/l, respectively. Analytical method involve the recovery ratio: Fish : 93.1 %, - Limit of quantitation : Test water : 1st concentration area : 3.1 microg/L, 2nd concentration area : 0.31 microg/L, Fish : 31 ng/g. Range finding study involve the LC50 (96h) 16.3 mg/L on Rice fish (Oryzias latipes). Lipid content of the test organisms at the start and end of exposure was determined to be 3.27% and 3.52%, respectively. The bioconcentration factor (BCF value) of test substance on Cyprinus carpio was determined to be in the range of 0.32-18 L/Kg and under steady state 7.3 L/Kg, respectively at a conc. of 0.1 mg/l and 3.2 - 47 L/Kg at a conc. of 0.01 mg/l, respectively.

 

For the test chemical,Bioaccumulation study was conducted on test organism Cyprinus carpio for 6 weeks for evaluating the bioconcentration factor (BCF value) of test chemical (authoritative database J-CHECK, 2018). The study was performed according to "OECD Guideline 305 C (Bioaccumulation: Test for the Degree of Bioconcentration in Fish)" and 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 was 2mg/land 0.2 mg/l, respectively. Analytical method involve the recovery ratio: Fish: 92.0 %, - Limit of quantitation: Test water: 1st concentration area; 0.049 mg/L, 2nd concentration area; 0.0049 mg/L, Fish: 0.54 microg/g. Range finding study involve the LC50(48h) ≥ 1000 mg/l on Rice fish (Oryzias latipes). Lipid content of the test organism Cyprinus carpio was determined to be 4.4%. The bioconcentration factor (BCF value) of test substance on Cyprinus carpio was determined to be in the range of ≤ 0.3 L/Kg at a conc. of 2 mg/l and ≤ 2.8 L/Kg at a conc. of 0.2 mg/l, respectively.

 

On the basis of above results for target chemical Tributylmethylammonium chloride (from modelling databases,2017), it can be concluded that the BCF value of test substance Tributylmethylammonium chloride ranges from 3.162 –5.62 which does not exceed the bioconcentration threshold of 2000, indicating that the chemical Tributylmethylammonium chloride is not expected to bioaccumulate in the food chain.