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Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Biodegradation in water:

28-days biodegradation study was conducted following the EEC, L 251 Vol. 27 (19.09.84) 84/449/EEC,C.5 guideline to determine the ready biodegradability of the test chemical. The study was performed at a temperature of 22±2°C. The test system included control, test item and reference item. Bacteria was used as a test inoculum for the study which was collected from activated sludge of the sewage treatment plant of CH-4106 Therwil on 16/10/89 The preparation was carried out according to the method described in the guideline. Test chemical conc. used for the study was 10.3 and 20.3 mg/l, respectively while that of reference substance was 20 mg/l conc. Aniline was used as a reference substance for the study. Flasks (dark brown glass) of 2 lit equipped with gas inlet and magnetic stirrer was used as a test vessel for the study.The test medium was prepared according to the method described in the guideline. Blank test system was setup during the study containing only water as specified in the guideline containing 0.5 ml of the Nonylphenol 10EO5PO solution.1200 ml of the mineral solution with the inoculum were aerated for 24 hours in the test vessel. In 300 ml mineral solution 0.5 ml Nonylphenol 10EO5PO (solution of 30 mg in 100 ml bidist. water) and 15.5 rsp. 30.4 mg of test substance were added and homogenized. This solution was given to the test vessel which was immediately connected to the CO2 traps. Determination of the initial CO2 of the 0.05 N sodium hydroxide and the CO2, absorbed in the absorbers filled with 200 ml 0.05 N sodium hydroxide on the days 3, 7, 10, 13, 17, 20, 24, 27 and 28.The biodegradation was calculated on the basis of the theoretical carbon content of the test substance and the cumulative quantities of carbon dioxide determined on the days of measurements. Accordingly, the % degradation of the test item after 28 days of incubation at 22 ± 2°C according to test was determined to be 34% and 7% after 28 days at a chemical conc. of 10.3 & 20.3 mg/l, respectively. Based on the results, the test item, under the test conditions, was considered to be primary inherently biodegradable in nature.

Biodegradation in water and sediments:

Estimation Programs Interface (2018) prediction model was run to predict the half-life in water and sediment for the test chemical. If released in to the environment, 0.702% 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 180 days (4320 hrs). The half-life (180 days estimated by EPI suite) indicates that the chemical is very persistent in water and the exposure risk to aquatic animals is moderate to high whereas the half-life period of test chemical in sediment is estimated to be 1620.833 days (38900 hrs). Based on this half-life value, it indicates that test chemical is very 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 (2018). If released into the environment, 38.7% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of test chemical in soil is estimated to be 360 days (8640 hrs). Based on this half-life value of test chemical, it is concluded that the chemical is very persistent in the soil environment and the exposure risk to soil dwelling animals is moderate to high.

Additional information

Biodegradation in water:

Two experimental studies for the target chemical were reviewed for the biodegradation end point and their results are summarized as below:

  In an experimental key study from study report (1989), 28-days biodegradation study was conducted following the EEC, L 251 Vol. 27 (19.09.84) 84/449/EEC,C.5 guideline to determine the ready biodegradability of the test chemical. The study was performed at a temperature of 22±2°C. The test system included control, test item and reference item. Bacteria was used as a test inoculum for the study which was collected from activated sludge of the sewage treatment plant of CH-4106.The preparation was carried out according to the method described in the guideline. Test chemical conc. used for the study was 10.3 and 20.3 mg/l, respectively while that of reference substance was 20 mg/l conc. Aniline was used as a reference substance for the study. Flasks (dark brown glass) of 2 lit equipped with gas inlet and magnetic stirrer was used as a test vessel for the study. The test medium was prepared according to the method described in the guideline. Blank test system was setup during the study containing only water as specified in the guideline containing 0.5 ml of the Nonylphenol 10EO5PO solution.1200 ml of the mineral solution with the inoculum were aerated for 24 hours in the test vessel. In 300 ml mineral solution 0.5 ml Nonylphenol 10EO5PO (solution of 30 mg in 100 ml bidist. water) and 15.5 rsp and 30.4 mg of test substance were added and homogenized. This solution was given to the test vessel which was immediately connected to the CO2 traps. Determination of the initial CO2 of the 0.05 N sodium hydroxide and the CO2, absorbed in the absorbers filled with 200 ml 0.05 N sodium hydroxide on the days 3, 7, 10, 13, 17, 20, 24, 27 and 28.The biodegradation was calculated on the basis of the theoretical carbon content of the test substance and the cumulative quantities of carbon dioxide determined on the days of measurements. Accordingly, the % degradation of the test item after 28 days of incubation at 22 ± 2°C according to test was determined to be 34% and 7% after 28 days at a chemical conc. of 10.3 & 20.3 mg/l, respectively. Based on the results, the test item, under the test conditions, was considered to be primary inherently biodegradable in nature.

 Another biodegradation study was conducted following the EEC L251, Vol. 27 (19.09.84), 84/449/EEC, C.9 guideline to determine the ready biodegradability of the test chemical. The study was performed at a temperature of 148 ± 3°C. For the preparation of the stock solution of test substance (TK 11484 ), 9.1 mg were dissolved and filled up to 100 ml with silver sulfate in sulfuric acid. The preparation of the stock solution of the reagents was carried out according the method described in the guideline. Potassium hydrogen phthalate was used as a reference substance for the study. Round bottom flasks of 250 ml equipped with a condenser was used as a test vessel for the study. Test system include the following test solutions i.e, Potassium dichromate solution, Mercury sulfate solution ,Silver sulfate solution and Sulfuric acid d=1.84 ,respectively. Bidistilled Water was used as a blank. Titration of the unreacted potassium dichromate with ammonium iron-II-sulfate was done on a METTLER Memotitrator. Titration solution used for the study was ammonium iron-II-sulfate 0.12 mol/l. The chemical oxygen demand was calculated on the basis of the amount of test substance and consumption of potassium dichromate. COD of the reference substance was determined to be 193.7 mg COD/l (limit: 192 – 208 mg COD/l) (n = 3, Srel.= 0.00%) and COD of the test chemical salts was determined to be 1.26 g O2/g test mat. after 2 hrs in the test condition. Based on the results, the test item, under the test conditions, was considered to be biodegradable in nature.

On the basis of above results for test chemical (from study reports, 1989), it can be concluded that the test chemical salts can be expected to be primary inherently biodegradable in nature.

Biodegradation in water and sediments:

Estimation Programs Interface (2018) prediction model was run to predict the half-life in water and sediment for the test chemical. If released in to the environment, 0.702% 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 180 days (4320 hrs). The half-life (180 days estimated by EPI suite) indicates that the chemical is very persistent in water and the exposure risk to aquatic animals is moderate to high whereas the half-life period of test chemical in sediment is estimated to be 1620.833 days (38900 hrs). Based on this half-life value, it indicates that test chemical is very 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 (2018). If released into the environment, 38.7% of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of test chemical in soil is estimated to be 360 days (8640 hrs). Based on this half-life value of test chemical, it is concluded that the chemical is very persistent in the soil environment and the exposure risk to soil dwelling animals is moderate to high.