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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable (according to OECD-criteria) 

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable
Type of water:
freshwater

Additional information

No study on the ready biodegradability of 2 -aminoethyldiethylamine (CAS 100 -36 -7) is available. Therefore, a read-across to the structurally similar substance 3 -diethylaminopropylamine (CAS 104 -78 -9) was performed.

The ready biodegradability of the 3-Diethylaminopropylamine (CAS 104 -78 -9) was determined according to the OECD guideline 301A (1993). The biodegradation of the substance was followed by exposing it to the municipal activated sludge from the wastewater treatment plant of Mannheim/Baden-Württemberg (Germany), stored in laboratory wastewater treatment plant which was fed with municipal sewage. The sludge was washed and aerated for 24 hours and then added to the test vessels to obtain a sludge concentration of 30 mg/L dry substance. The control substance (aniline) was biodegraded by an average of 90-100 % over 14 days. Under the test conditions the test substance 3 -diethylaminopropylamine was found to be readily biodegradable over the test period of 28 days (BASF AG, 2005, report no.: 21G0264/053110). Furthermore, the test substance showed no inhibitory effect on the microorganisms. At the end of the test, 3 -diethylaminopropylamine was biodegraded by an average of 90-100 % (DOC removal), therefore the validity criteria were fulfilled.

3-Diethylaminopropylamine (CAS 104 -78 -9) was easily eliminated from water in a Zahn-Wellens batch test according to OECD 302B (non-GLP); however, activated sludge from a wastewater plant treating industrial sewage was used as inoculum. The substance was degraded to 96% after 18 d based on DOC removal (BASF AG, 1983, report no.: 347).

In addition two non-GLP studies performed according to the OECD guideline 302B (Inherent biodegradability: Zahn-Wellens/EMPA Test) with the 2 -aminoethyldiethylamine (CAS 100 -36 -7) have been performed.

-The biodegradation of the test substance was followed by exposing it to activated sludge from industrial waste water treatment plant over 28 days. According to this OECD 302B test, the test item is easily removed from water. But since the activated sludge used in this test is from industrial waste water treatment plant instead of municipal wastewater treatment plant, it is not possible to make a conclusion concerning the biodegradability of the substance. The test item was degraded by 84 % after 28 days based on DOC removal (BASF AG, 1983, report no.: 347).

- The biodegradation of the substance was followed by exposing it to the activated sludge from industrial waste water treatment plant over 28 days. According to this OECD 302B test, the test item is easily removed from water. But since the activated sludge used in this test is from industrial waste water treatment plant instead of municipal wastewater treatment plant, it is not possible to make a conclusion concerning the biodegradability of the substance. The test item was degraded 82 % after 28 days based on DOC removal (BASF AG, 1988, report no.: 01.1190/87).

In conclusion, 2 -aminoethyldiethylamine is considered to be readily biodegradable (according to OECD-criteria).