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Environmental fate & pathways

Hydrolysis

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Description of key information

Hydrolysis will not significantly contribute to the removal of DIDP from the environment. The DIDP hydrolysis half-life (25 degrees C) is calculated as:
pH 7 = 3.4 years
pH 8 = 125.2 days

Key value for chemical safety assessment

Additional information

Results from the EQC (Equilibrium Criterion) Levels I and III distribution models (Mackay, 2001) show that because of its low water solubility, DIDP is not expected to partition to the water compartment (see Section 4.2.3). However, abiotic degradation of any trace amounts of DIDP which may be present in aquatic environments is unlikely to occur at a significant rate based on modeled data. The HYDROWIN model, a subroutine within the USEPA (2000) computer program, estimates a hydrolysis half-life for DIDP of 3.4 years at pH 7 (25°C) and 125.2 days at pH 8 (25°C).