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Environmental fate & pathways

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In the atmosphere rapid degradation takes place by indirect photolysis with OH radicals considering a OH concentration of 500,000 radicals/cm³ as a 24h-average. The half-life is calculated to be 1.8 hours. (Currenta, 2009).

Stability in Water:

The stability of N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD) in aqueous test solution was determined in a hydrolysis test according to OCED Guideline 111 (Hydrolysis as a function of pH). Another test reported the key value for the half-life at environmental relevant conditions (pH7, 25°C) of 3.9 hours. The main hydrolysis product was identified as 4-hydroxydiphenylamine (CAS Nr. 122-37-2) which also was found in the oxidised form p-benzoquinoneimine-N-phenyl (Monsanto, 1986). From these findings IPPD is regarded as rapidly degradable in aqueous media.