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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The ready biodegradability of the test item was assessed according to the OECD guideline 301 D “Ready biodegradability: Closed Bottle Test”. Under the test conditions, the percentage of biodegradation of 1,3-diethyl-2-thiourea reached 3 % of the ThOD at the end of the test (28 days).

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The ready biodegradability of the test item was assessed according to the OECD guideline 301 D “Ready biodegradability: Closed Bottle Test”.

According to the OECD guideline 301, the pass level for ready biodegradability is 60 % of Theoretical Oxygen Demand (ThOD). This level has to be reached in a 10-d window within the 28-d period of the test. The 10-d window begins when the degree of biodegradation has reached 10 % of ThOD and must end before day 28 of the test.

Under the test conditions, the percentage of biodegradation of 1,3-diethyl-2-thiourea reached 3 % of the ThOD at the end of the test (28 days).

According to OECD guideline 301, 1,3-diethyl-2-thiourea is not readily biodegradable.

1,3-diethyl-2-thiourea did not inhibit the micro-organisms as shown by the toxicity control flask where biodegradation percentage is 47% higher than 25 % within 14 days.