Registration Dossier
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EC number: 269-087-2 | CAS number: 68187-32-6
Endpoint summary
Administrative data
Description of key information
Biodegradation in water
42-days Closed Bottle test following the OECD guideline 301 D to determine the ready biodegradability of the test chemical. The study was performed at a temperature of 20°C under aerobic conditions. The test system included control, test item, reference item and toxicity control. Polyseed were used for this study. The concentration of test and reference item (Sodium Benzoate) chosen for both the study was 4 mg/L, while that of inoculum was 1 ml/l. OECD mineral medium was used for the study. ThOD (Theoretical oxygen demand) of test and reference item was determined by calculation. % degradation was calculated using the values of BOD and ThOD for test item and reference item. The % degradation of procedure control (reference item) was also calculated using BOD & ThOD and was determined to be 74.85%. Degradation of Sodium Benzoate exceeds 59.88% on 7 days & 77.84% on 14th day. The activity of the inoculum is thus verified and the test can be considered as valid. The BOD42 value of test chemical was observed to be 0.45 mgO2/mg. ThOD was calculated as 0.85 mgO2/mg. Oxygen depletion in the inoculum blank did not exceed 1.5 mg dissolved oxygen/L after 28 days. The residual conc. of oxygen in test bottles did not fall below 0.5 mg/L at any time, % degradation of reference compound has reached the pass levels (60% of ThOD) by day 14 and in a toxicity test, containing both the test substance and a reference compound, >25% biodegradation occurred within 14 days, test substance cannot be assumed to be inhibitory. Thus, fulfilling the validity crtieria as per OECD test guideline and hence, study is considered to be valid. Accordingly, the % degradation of the test chemical after 42 days of incubation at 20 ± 1°C according to Closed Bottle test was determined to be 52.94%. Based on the results, the test chemical, under the test conditions, was considered to be inherently biodegradable in nature.
Biodegradation in water and sediment
Level III Fugacity prediction model was run to predict the half-life in water and sediment for the test chemical. If released in to the environment, 18% 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 15 days. The half-life (15 days estimated by EPI suite) indicates that the chemical is not persistent in water and the exposure risk to aquatic animals is moderate to low whereas the half-life period of test chemical in sediment is estimated to be 140 days. However, as the percentage release of test chemical into the sediment is less than 10% (i.e, reported as 9%), indicates that test chemical is not persistent in sediment.
Biodegradation in soil
The PBT Profiler has estimated that test chemical is expected to be found predominantly in soil and its persistence estimate is based on its availability in this medium. Its half-life in soil, 30 days. This does not exceed the threshold of 180 days as mentioned in the REACH regulation. Therefore, test chemical is estimated to be non persistent in the soil environment.
Additional information
Biodegradation in water
42-days Closed Bottle test following the OECD guideline 301 D to determine the ready biodegradability of the test chemical. The study was performed at a temperature of 20°C under aerobic conditions. The test system included control, test item, reference item and toxicity control. Polyseed were used for this study. The concentration of test and reference item (Sodium Benzoate) chosen for both the study was 4 mg/L, while that of inoculum was 1 ml/l. OECD mineral medium was used for the study. ThOD (Theoretical oxygen demand) of test and reference item was determined by calculation. % degradation was calculated using the values of BOD and ThOD for test item and reference item. The % degradation of procedure control (reference item) was also calculated using BOD & ThOD and was determined to be 74.85%. Degradation of Sodium Benzoate exceeds 59.88% on 7 days & 77.84% on 14th day. The activity of the inoculum is thus verified and the test can be considered as valid. The BOD42 value of test chemical was observed to be 0.45 mgO2/mg. ThOD was calculated as 0.85 mgO2/mg. Oxygen depletion in the inoculum blank did not exceed 1.5 mg dissolved oxygen/L after 28 days. The residual conc. of oxygen in test bottles did not fall below 0.5 mg/L at any time, % degradation of reference compound has reached the pass levels (60% of ThOD) by day 14 and in a toxicity test, containing both the test substance and a reference compound, >25% biodegradation occurred within 14 days, test substance cannot be assumed to be inhibitory. Thus, fulfilling the validity crtieria as per OECD test guideline and hence, study is considered to be valid. Accordingly, the % degradation of the test chemical after 42 days of incubation at 20 ± 1°C according to Closed Bottle test was determined to be 52.94%. Based on the results, the test chemical, under the test conditions, was considered to be inherently biodegradable in nature.
Biodegradation in water and sediment
Level III Fugacity prediction model was run to predict the half-life in water and sediment for the test chemical. If released in to the environment, 18% 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 15 days. The half-life (15 days estimated by EPI suite) indicates that the chemical is not persistent in water and the exposure risk to aquatic animals is moderate to low whereas the half-life period of test chemical in sediment is estimated to be 140 days. However, as the percentage release of test chemical into the sediment is less than 10% (i.e, reported as 9%), indicates that test chemical is not persistent in sediment.
Biodegradation in soil
The PBT Profiler has estimated that test chemical is expected to be found predominantly in soil and its persistence estimate is based on its availability in this medium. Its half-life in soil, 30 days. This does not exceed the threshold of 180 days as mentioned in the REACH regulation. Therefore, test chemical is estimated to be non persistent in the soil environment.
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