E-beam degradation of dibutyl phthalate (DBP) in oxidation system (acetonitrile/water)

reduction system (methanol/water

t-BuOH/water)

and pure water systems was investigated. DBP concentration in the four solutions was determined by HPLC

and the degradation products were analyzed by GC/MS. The results showed that the DBP degradation followed pseudo-first-order kinetics. DBP in a concentration of 7.8mg/L

in all solutions but the t-BuOH/water

could be degraded in a rate of over 85% by 0.5 kGy E-beam irradiation The degradation products included diethyl phthalate

bis(2-methylpropyl)ester

and 1

2-Benzenedicarboxylc acid in the three solutions. Finally

mechanism of the DBP degradation was discussed.