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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

The primary biodegradation was studied using Mississippi river water under aerobic conditions. The estimated half-lives due to primary transformation is  2.9 hours.

Key value for chemical safety assessment

Half-life in freshwater:
2.9 h
at the temperature of:
24 °C

Additional information

The primary biodegradation for biological and chemical transformations of 6PPD was studied using Mississippi river water under aerobic conditions. Controls of this biodegradation study were made with sterile and with deionized water. After 22 h, when the experiment was finished, 97 % of 6PPD had disappeared from the active river water, 96 % from the sterile river water, and 88 % from the deionized water. The estimated half-lives due to primary transformation ranged from 2.9 to 6.8 hours.

No transformation products were identified. The study is not comparable to a full test according to OECD guidelines. The test duration was only 22h. Thus only abiotic degradation can be observed. Taking information from ready biodegradation tests into account, biodegradation is not expected under the test conditions. (Monsanto 1981) These results only reflect the primary degradation of the substance.