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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 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 (active river water) to 6.8 hours (purified water). (Monsanto 1981)

Key value for chemical safety assessment

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

Additional information

No biodegradation (in water and sediment) study for 77PD is available. 6PPD is an analogue substance. For read-across justification see document attached to IUCLID chapter 13.

Due to the analogous structure to 6PPD a key study from the supporting substance was taken as read across to 77PD.

The primary biodegradation for biological and chemical transformations of 6PPD was studied using Mississippi river water under aerobic conditions. Sterile and deionized water served as controls in this biodegradation study. 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, (Monsanto 1981).