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Environmental fate & pathways

Biodegradation in water: screening tests

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28-days Manometric respirometry test followingthe OECD guideline 301Fto determine the ready biodegradability of the test item 3-phenoxybenzylic alcohol (CAS No. 13826-35-2). The test system included control, test item and reference item. The concentration of test and reference item (Sodium Benzoate) chosen for both the study was 100mg/L, while that of inoculum was 10ml/l. 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 BOD28value of3-phenoxybenzylic alcohol(CAS No. 13826-35-2) was observed to be 0.164 mgO2/mg. ThOD was calculatedas 2.397 mgO2/mg. Accordingly, the % degradation of the test item after 28 days of incubation at 20 ± 1°C according to manometric respirometry test was found to be 6.84%. Based on the results, the test item, under the test conditions, was found to be Non- Biodegradable at 20 ± 1°C over a period of 28 days.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

As per the study conducted by UERL report no. -13826-35-2/01/2015/RBD28-days Manometric respirometry test following the OECD guideline 301F was used to determine the ready biodegradability of the test item 3-phenoxybenzylic alcohol (CAS No. 13826-35-2). The test system included control, test item and reference item. The concentration of test and reference item (Sodium Benzoate) chosen for both the study was 100mg/L, while that of inoculum was 10ml/l. 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 BOD28value of 3-phenoxybenzylic alcohol(CAS No. 13826-35-2) was observed to be 0.164 mgO2/mg. ThOD was calculatedas 2.397 mgO2/mg.Accordingly, the % degradation of the test item after 28 days of incubation at 20 ± 1°C according to manometric respirometry test was found to be 6.84%. Based on the results, the test item, under the test conditions, was found to be Non- Biodegradable at 20 ± 1°C over a period of 28 days.

The biodegradation in water of 3-Phenoxybenzyl alcohol has been predicted with the BIOWIN program (version 4.10). Based on the results from the predictions with Biowin models it can be concluded that 3-Phenoxybenzyl alcohol, is not readily biodegradable in water. 

The Fugacity model III indicates the half life of the 3-Phenoxybenzyl alcohol as 15 days in water medium, which clearly indicate that the substance 3-Phenoxybenzyl alcohol is not persistent in water medium as well as soil (half life 30 days).

Based on the above results only 6.84 % degradation is observed in the period of 28 days .Also the half life predicted as per EPI prediction model verison 4.1,the half life was found to be 15 days(Fugacity model) indicating the substance to be not readily biodegradable in water.