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Environmental fate & pathways

Hydrolysis

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Description of key information

In a weight-of-evidence approach it was found that IPPD hydrolyses quickly under environmental conditions (pH7, 20°C with a half-life of 3.9 hourfs.  The main hydrolysis product was identified as 4-hydroxydiphenylamine (CAS Nr. 122-37-2) which also was found in the oxidised form Benzo-quinoneimine-N-phenyl. 

Key value for chemical safety assessment

Half-life for hydrolysis:
3.9 h
at the temperature of:
25 °C

Additional information

Hydrolysis as a function of pH of IPPD was performed according to EU method C.7 'Degradation - Abiotic Degradation Hydrolysis as a Function of pH' (1992). The half-life time of hydolysis at pH 4.1 and 50 °C was estimated about 22 hours (35°C: 75 hours). For pH 7 and 9 at 50 °C the half-life times of hydrolysis were estimated 1.3 and 1.2 hours (DUSLO a.s., 2008)

The weight-of evidence appraoch was completed with a study (Monsanto 1986). This study yielded a half-life under environmental realistic conditions and the hydrolysis products were identified.