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Environmental fate & pathways

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A test on the hydrolysis potential of DBP indicated that at pH 4.0 and 7.0 DBP was found to be stable, i.e. less than 10% hydrolysis after 5 days. The study was performed according to EU method C.7 at pH values of 4, 7 and 9 and a temperature of 50°C and, additionally at 39°C for pH = 9 (BASF, 1989). The lowest half-life values occur at a pH of 9 resulting in a DT50 of 2.7 days at 50°C and 8.2 days at 39°C.

According to EU RAR, 2004 the photooxidation by OH radicals contributes to the elimination of DBP from the atmosphere. The

experimental degradation rate constant amounts to about 18.10-12 cm3/mol.sec corresponding to a half-life of 21.4 hours at an average OH concentration of 500,000 molecules/cm3.