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Environmental fate & pathways

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Description of key information

Bioaccumulation: aquatic / sediment:

Using BCFBAF Program (v3.00) model of EPI suite (2018) the estimated bio concentration factor (BCF) for test chemical is 3.162 L/kg wet-wt at 25 °C which does not exceed the bioconcentration threshold of 2000. Therefore it is concluded that test chemical is non-bioaccumulative in food chain.

Additional information

Bioaccumulation: aquatic / sediment:

Based on the predicted and experimental data of test chemical and read across chemicals has been reviewed to study the bioaccumulation rate of test chemical. All the studies are as mentioned below:

 

Using BCFBAF Program (v3.00) model of EPI suite (2018) the estimated bio concentration factor (BCF) for test chemical is 3.162 L/kg wet-wt at 25 °C which does not exceed the bioconcentration threshold of 2000. Therefore it is concluded that test chemical is non-bioaccumulative in food chain.

 

Similar data 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 was estimated to be 462 dimensionless. The predicted BCF result based on the 5 OECD principles. Thus based on the result it is concluded that the test substance is non-bioaccumulative in nature.

 

Above data further supported by the experimental data from authoritative database. Bioaccumulation test was conducted for 28 days for determination the bioconcentration factor (BCF) and lipid content of test substance on test organism. Test conducted according to the OECD Guideline 305 (Bioconcentration: Flow-through Fish Test). Cyprinus carpio was used as a test organism. Range finding study was conducted on Rice fish (Oryzias latipes). 1 µg/L and 10 µg/L concentrations was used in the study. Study conducted under the flow-through system for 96 hours.Bioconcentration factor was calculated in the interval of 9 days, 13 days, 15 days, 20 days and 28 days. By analytical methods, the limit of quantification was found to be 0.18 µg/l in 1st concentration area and 0.018µg/l 2nd concentration area. Whereas the lipid content at the start and end of exposure was observed to be 2.87% and 1.94%, respectively. Under the test condition, the BCF value for test substance was observed to be ≤ 0.91 L/kg at dose concentration 10 micro g/L and ≤ 9.1 L/kg at dose concentration 1 micro g/L on test organism Cyprinus carpio during 28 day period. These values indicate that the substance is not bioaccumulative.

 

Based on the above studies and various data, it is observed that the substance is not bioaccumulative. As it does not exceed the bioconcentration threshold of 2000. Therefore it is concluded that test chemical is non-bioaccumulative in food chain.