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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

As sediment is not a target compartment, a simulation biodegradation study was conducted in soil.

Key value for chemical safety assessment

Additional information

No biodegradation was observed in the ready biodegradability study (OECD 301 A; -33.7% biodegradation in 28 days) with Reaction mass of 2-(3,4-dimethyl-1H-pyrazol-1-yl)succinic acid and 2-(4,5-dimethyl-1H-pyrazol-1-yl)succinic acid. Based on this result, the degradation of the test substance in surface waters is expected to be very slow, and for the purpose of the risk assessment no degradation is assumed in surface waters. However, due to its sole use as fertiliser on agricultural crops, release into surface waters and sediment is unlikely. A simulation study was therefore performed in soil (OECD 307). According to the Guidance on information requirements and chemical safety assessment Chapter R.7b: Endpoint specific guidance, a single simulation study is sufficient if the relevant medium and concentrations are selected.

Reaction mass of 2-(3,4-dimethyl-1H-pyrazol-1-yl)succinic acid and 2-(4,5-dimethyl-1H-pyrazol-1-yl)succinic acid is not expected to pose a risk to the aquatic environment. This is confirmed by the quantitative risk assessment performed for the test substance, which shows no risk for the water and sediment compartments at the relevant conditions. No further simulation testing for biodegradation in water and sediment is therefore proposed.