Trichloroacetaldehyde

Endpoint summary

Description of key information

Biodegradation in water: secreening tests:

Study was conducted for 28 days for evaluating the percentage biodegradability of test substance in this study the concentration of inoculum i.e, sludge used was 30 mg/l and initial test substance conc. used in the study was 100 mg/l. The percentage degradation of test substance was determined to 8, 0 and 70% by BOD, TOC removal and HPLC parameter in 28 days. Thus, based on percentage degradation (8 and 0%), test chemical is considered to be not readily biodegradable in nature.

Biodegradation in water: simulation tests:

Estimation Programs Interface (EPI Suite, 2020) prediction model was run to predict the half-life in water for the test chemical. If released in to the environment, 46.1% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of test chemical in water is estimated to be 60 days (1440 hrs). The half-life (60 days estimated by EPI suite) indicates that the chemical is persistent in water and the exposure risk to aquatic animals is moderate to high.

Biodegradation in sediments: simulation tests:

Estimation Programs Interface (EPI Suite, 2020) prediction model was run to predict the half-life in sediment for the test chemical. If released in to the environment, the half-life period of test chemical in sediment is estimated to be 541.66 days (13000 hrs). However, as the percentage release of test chemical into the sediment is less than 1% (i.e, reported as 0.0942%), indicates that test cheemical is not persistent in sediment.

Biodegradation in soil:

The half-life period of test chemical in soil was estimated using Level III Fugacity Model by EPI Suite version 4.1 estimation database (EPI suite, 2020). If released into the environment, 53.8% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of test cheemical in soil is estimated to be 120 days (2880 hrs). Based on this half-life value of test chemical, it is concluded that the chemical is not persistent in the soil environment and the exposure risk to soil dwelling animals is moderate to low.

Additional information

Biodegradation in water: Screening test :

Different studies were performed to determine the Biodegradation in water of test chemical and its structurally similar read across chemical and results are summarized below.

In the first study from authoritative database the experiment was conducted for 28 days for evaluating the percentage biodegradability of test substance in this study the concentration of inoculum i.e, sludge used was 30 mg/l and initial test substance conc. used in the study was 100 mg/l. The percentage degradation of test substance was determined to 8, 0 and 70% by BOD, TOC removal and HPLC parameter in 28 days. Thus, based on percentage degradation (8 and 0%), test chemical is considered to be not readily biodegradable in nature.

 

In next study the Estimation Programs Interface Suite (EPI suite, 2020) was run to predict the biodegradation potential of the test chemical in the presence of mixed populations of environmental microorganisms. The biodegradability of the substance was calculated using seven different models such as Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI Linear Model, MITI Non-Linear Model and Anaerobic Model (called as Biowin 1-7, respectively) of the BIOWIN v4.10 software. The results indicate that chemical is expected to be not readily biodegradable.

 

To support the above results another study was conducted for 14 days for evaluating the percentage biodegradability of test substance in this study the concentration of inoculum i.e, sludge used was 30 mg/l and initial test substance conc. used in the study was 100 mg/l. The percentage degradation of test substance was determined to be 0 % by O2 consumption (BOD) and test chemical analysis by GC parameter in 14 days. Thus, based on percentage degradation value, test chemical is considered to be not readily biodegradable in nature.

 

By considering the results of all the studies mentioned above it is concluded that test chemical is not readily biodegradable in nature.

Biodegradation in water: simulation tests:

Estimation Programs Interface (EPI Suite, 2020) prediction model was run to predict the half-life in water for the test chemical. If released in to the environment, 46.1% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of test chemical in water is estimated to be 60 days (1440 hrs). The half-life (60 days estimated by EPI suite) indicates that the chemical is persistent in water and the exposure risk to aquatic animals is moderate to high.

Biodegradation in sediments: simulation tests:

Estimation Programs Interface (EPI Suite, 2020) prediction model was run to predict the half-life in sediment for the test chemical. If released in to the environment, the half-life period of test chemical in sediment is estimated to be 541.66 days (13000 hrs). However, as the percentage release of test chemical into the sediment is less than 1% (i.e, reported as 0.0942%), indicates that test cheemical is not persistent in sediment.

Biodegradation in soil:

The half-life period of test chemical in soil was estimated using Level III Fugacity Model by EPI Suite version 4.1 estimation database (EPI suite, 2020). If released into the environment, 53.8% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of test cheemical in soil is estimated to be 120 days (2880 hrs). Based on this half-life value of test chemical, it is concluded that the chemical is not persistent in the soil environment and the exposure risk to soil dwelling animals is moderate to low.