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Environmental fate & pathways

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Biodegradation in water:

For MCPP-P acid the 28-day degradation was 85 % and for the positive control (with reference substance benzoic acid, sodium salt) the biodegradation was 87 % after 14 days. In conclusion, MCPP-P acid is considered to be "Readily Biodegradable". MCPP-P 2-EHE hydrolyses to MCPP-P acid, the acid is used as a relevant point to assess the biodegradation of MCPP-P 2-EHE in water. Therefore, MCPP-P 2-EHE is considered to be readily biodegradable.

MCPP-P is readily degraded in the aerobic aquatic systems and is therefore unlikely to persist in the aquatic environment. Half-life in water of 24 hours and half-life in sediment/water system of 23 hours were determined.

Biodegradation in sediment:

The study on sediment screening does not need to be conducted becasue direct and indirect exposure of the sediment is unlikely.

Biodegradation in soil:

The rate of degradation of MCPP-P 2-EHE applied as a commercial formulation also containing ioxynil octanoate to sandy loam soil under aerobic conditions at 5 °C was studied over 56 days. The half-life of MCPP-P 2-EHE was calculated at 8.3 days. The major degradation product over the period of the study was MCPP-P acid.

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